The best mini split air conditioners pair room-appropriate capacity with efficient heating and cooling, practical controls, and an installation plan that fits your home. My best overall pick is the Senville LETO 12,000 BTU, a balanced heating-and-cooling option; the Temprium 12,000 BTU, 22 SEER2 stands out for stated efficiency, while the MEPTY 12,000 BTU, 19 SEER2 is a strong fit for buyers who want a 115V system. The main tradeoffs are not just efficiency versus upfront equipment cost: buyers also need to match capacity to the room, confirm electrical requirements, and account for installation and cold-weather performance. A higher SEER2 figure alone cannot determine which unit will work best in a particular home. Read on for the full comparison, selection criteria, and guidance for choosing a mini split that suits your space.
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Key Takeaways
- Capacity and room size set the shortlist: This group includes 9,000, 12,000, 11,500, and 18,000 BTU options, so buyers can compare smaller-room systems with units aimed at larger spaces.
- Efficiency claims vary widely within the 12,000 BTU segment: Listed SEER2 figures range from 17 to 22, but the higher figure matters most when the unit is sized correctly and used often.
- Voltage is a practical dividing line: Many listed models are 115V or 110V, while the 18,000 BTU Rellytech is listed at 208–230V; confirm circuit capacity before choosing.
- Some listings add convenience features: The 9,000 BTU Temprium explicitly lists Wi-Fi, while several other product names emphasize basic heating and cooling rather than connected controls.
- Brand and capacity alone do not settle the choice: The lineup contains multiple near-matching Rellytech, COSTWAY, Senville, and Temprium variants, so compare the exact voltage, efficiency, and feature set in the listing.
| mini split air conditioner | Cooling capacity | Voltage | Noise level | Efficiency |
|---|---|---|---|---|
| Senville LETO 12,000 BTU Mini | 12,000 BTU | 110 V | 28 dB | — |
| Garvee 12,000 BTU 115V Mini Sp | 12,000 BTU | 115 V | 23 dB in Sleep mode | 19 SEER2 |
| Senville LETO Mini Split Air C | 9,000 BTU | — | — | — |
| MEPTY 12000 BTU Mini Split AC | 12,000 BTU | 110–115 V | 26 dB | 19 SEER2 |
| Rellytech 11500 BTU Ductless M | 11,500 BTU | 115 V | 29 dB | 17 SEER2 |
| Tehanld 12,000 BTU Mini Split | 12,000 BTU | 115V | — | 17 SEER2 |
| Albott 12,000 BTU Mini Split A | 12,000 BTU | 115V | Below 29 dB | — |
| COSTWAY 12,000 BTU Mini-Split | 12,000 BTU | — | 23 dB | — |
| Temprium 12,000 BTU Mini-Split | 12,000 BTU | 115V | As low as 23 dB | 22 SEER2 |
| Rellytech Mini Split AC/Heatin | 18,000 BTU | 208–230V | — | 19 SEER2 |
| COSTWAY 12,000 BTU Mini-Split | 12,000 BTU | 115 V | As low as 28 dB | 20 SEER2 |
| Temprium 9000 BTU Mini Split A | 9,000 BTU | 115 V | 23 dB | 22 SEER2 |
| YITAHOME 12,000 BTU Mini-Split | 12,000 BTU | 115 V | Below 41 dB | 20 SEER2 |
| Rellytech Mini Split AC Heatin | 12,000 BTU | 115 V/110 V | 42 dB | 19 SEER2 |
| Rellytech 9,000 BTU 115V Mini | 9,000 BTU | 115 V | 42 dB | 19 SEER2 |
More Details on Our Top Picks
Senville LETO 12,000 BTU Mini Split Air Conditioner and Heat Pump
I’d put the Senville LETO 12,000 BTU first for shoppers who want one system to cover everyday cooling and heating without giving up convenient controls. Its Alexa and app support make temperature changes easier to manage than on the MEPTY, whose listed controls are remote-based. The included 16-foot line set and remote also give installers key components in the box, though this is still a split system that requires professional installation. Heat-pump operation down to 5°F adds useful cold-weather range, while dehumidify and fan modes extend its use beyond peak summer. The tradeoff is that the warranty covers parts and the compressor, not installation labor. I’d choose it over the smaller 9,000 BTU LETO when the room needs more capacity; for a compact space, that smaller model may be a better fit.
Pros:- Combines cooling, heat-pump heating, dehumidification, and fan modes
- Supports Alexa and app control as well as a remote
- Includes a 16-foot line set and installation kit
- Parts and compressor are covered by a five-year warranty
Cons:- Professional installation is required
- Warranty excludes labor costs
Best for: Homeowners seeking a 12,000 BTU system with app and Alexa controls, heating, and a supplied line set for a professionally installed room upgrade.
Not ideal for: DIY installers or buyers who need labor coverage under the warranty; professional installation is required and labor is excluded.
- Cooling capacity:12,000 BTU
- Noise level:28 dB
- Refrigerant:R-454B
- Voltage:110 V
- Wattage:1,020 W
- Line set:16 feet
- Controls:Remote, Alexa, and app
- Warranty:Five years on parts and compressor
Our verdict“Choose the 12,000 BTU LETO for a feature-rich, connected system with a broad set of climate modes, provided you have a professional installer.”
Garvee 12,000 BTU 115V Mini Split Air Conditioner with Heat Pump
The Garvee’s clearest distinction is its 23 dB Sleep mode, the lowest specified noise level among these five options. That makes it a candidate for bedrooms where nighttime sound matters more than connected controls; unlike the Senville LETO 12,000 BTU, the supplied details don’t list Alexa or app support. Its 12,000 BTU cooling and 12,500 BTU heating, plus four operating modes, suit buyers looking for year-round use in a space listed as up to 750 square feet. The stated 19 SEER2 rating gives it a defined efficiency figure, but it does not make this model a clear efficiency leader: the MEPTY also lists 19 SEER2 and a lower 26 dB noise level outside Garvee’s Sleep-mode claim. I’d be cautious about the conflicting warranty information and plan for professional installation.
Pros:- Sleep mode is specified at 23 dB
- Provides 12,000 BTU cooling and 12,500 BTU heating
- Includes cooling, heating, dry, and fan-only modes
- Listed coverage extends up to 750 square feet
Cons:- Warranty details conflict between the listed one-year term and a five-year manufacturer-warranty claim
- Professional installation is required
- The two packages may arrive separately
Best for: Bedroom or home-office owners prioritizing a quiet sleep setting and needing a 12,000 BTU system with both heating and cooling.
Not ideal for: Buyers who want dependable warranty terms confirmed before ordering or expect a DIY installation; the listing gives inconsistent warranty details and requires professional installation.
- Cooling capacity:12,000 BTU
- Heating capacity:12,500 BTU
- Listed coverage:Up to 750 sq. ft.
- Efficiency:19 SEER2
- Voltage:115 V
- Wattage:1,450 W
- Noise level:23 dB in Sleep mode
- Modes:Cooling, heating, dry, and fan-only
- Warranty:Listing is inconsistent: one year in item details; description also claims five years
Our verdict“Pick the Garvee if a quiet Sleep mode matters more than app controls, but verify the warranty terms before purchase.”
Senville LETO Mini Split Air Conditioner and Heat Pump, 9000 BTU, White
For a smaller room, I’d favor the 9,000 BTU Senville LETO over the 12,000 BTU models in this group rather than choosing capacity by habit. It keeps the same practical combination of cooling, heat-pump heating down to 5°F, dehumidifying, and fan operation found on its larger LETO sibling, while adding Alexa integration and an included 16-foot line set. That makes it a compact-capacity alternative to the MEPTY or Garvee, both listed at 12,000 BTU and up to 750 square feet. The lower capacity is also its main limit: buyers with a larger or more demanding area should look at the 12,000 BTU LETO instead. As with that model, professional installation is required, and the five-year parts-and-compressor warranty does not cover the installer’s labor.
Pros:- 9,000 BTU capacity is a smaller-room alternative to the 12,000 BTU models
- Heating is specified down to 5°F
- Includes cooling, heating, dehumidifying, and fan modes
- Alexa integration and a 16-foot line set are included
Cons:- Professional installation is required and it is not suited to DIY installation
- Warranty covers parts and compressor but not installation labor
- Lower capacity may not suit larger rooms or higher heat loads
Best for: Owners of smaller rooms who want heat-pump operation, Alexa control, and a 9,000 BTU system from the Senville LETO line.
Not ideal for: Buyers cooling a large, open, or high-heat-load area who need the greater listed capacity of the 12,000 BTU LETO or other 12,000 BTU options.
- Cooling capacity:9,000 BTU
- Heating range:Down to 5°F (-15°C)
- Modes:Cooling, heating, dehumidifying, and fan
- Controls:Alexa integration and remote
- Inverter:DC inverter
- Line set:16 feet
- Certifications:UL Listed and AHRI Certified
- Warranty:Five years on parts and compressor
Our verdict“Choose this LETO for a smaller space that still needs connected controls and cold-weather heat-pump operation.”
MEPTY 12000 BTU Mini Split AC and Heating System, 19 SEER2 Energy Efficient Ductless Inverter Air Conditioner with Heat Pump, 110V, Cools Up to 750 sq.ft
The MEPTY is a strong match for buyers who want a 12,000 BTU inverter system with a stated 19 SEER2 rating and quiet operation. Its listed 26 dB noise level is lower than the Senville LETO 12,000 BTU’s 28 dB figure, while the Garvee’s lower 23 dB rating applies specifically to Sleep mode, so the numbers are not directly equivalent. MEPTY also covers the familiar four modes—cooling, heating, fan, and dehumidifying—and lists coverage up to 750 square feet. A 24-hour timer and remote offer straightforward scheduling, but the provided specs do not mention app or voice control as the Senville does. The listing says a new outdoor unit is needed, and professional installation is typical for this system type. I’d check what the installation package includes before buying.
Pros:- 19 SEER2 rating paired with inverter technology
- Listed noise level is 26 dB
- Includes cooling, heating, fan, and dehumidifying modes
- Remote control includes a 24-hour timer
Cons:- Listing says a new outdoor unit is needed
- Professional installation is typically required
- App and voice controls are not specified in the supplied product details
Best for: Homeowners seeking a 12,000 BTU inverter mini split for a space up to 750 square feet who value quiet operation and scheduled control.
Not ideal for: Buyers seeking Alexa or app control, a clearly specified complete outdoor-unit package, or an installation they can handle without a professional.
- Cooling capacity:12,000 BTU
- Listed coverage:Up to 750 sq. ft.
- Efficiency:19 SEER2
- Voltage:110–115 V
- Wattage:1,100 W
- Noise level:26 dB
- Refrigerant:R32
- Modes:Cooling, heating, fan, and dehumidifying
- Controls:Remote with 24-hour timer
Our verdict“Choose the MEPTY for quiet, scheduled operation in a space within its stated coverage, after confirming the outdoor-unit and installation requirements.”
Rellytech 11500 BTU Ductless Mini Split AC/Heating System, 17 SEER2 Inverter
The Rellytech stands apart through 4D auto-swing louvers and iFEEL temperature sensing, features aimed at distributing air and responding to conditions near the remote. That makes it a different proposition from the Senville LETO models, which lead with Alexa control and, in the 12,000 BTU version, a higher stated capacity. Rellytech’s 11,500 BTU capacity and listed 550-square-foot coverage suit a more modest space, while its 17 SEER2 rating is below the 19 SEER2 figures listed for the Garvee and MEPTY. The supplied 16.42-foot copper line set is useful for installation planning, but this is hardwired rather than plug-and-play, and the power cord is not included. I’d shortlist it for airflow control, not for the highest stated efficiency or simplest setup.
Pros:- 4D auto-swing louvers help direct airflow around the room
- iFEEL technology uses the remote location for temperature sensing
- Includes a 16.42-foot copper line set
- Five-year limited warranty is listed
Cons:- 17 SEER2 is below the 19 SEER2 ratings listed for the Garvee and MEPTY
- Hardwired installation is required rather than plug-and-play setup
- Power cord is not included
Best for: Owners of spaces up to 550 square feet who want directional airflow features and remote-position temperature sensing.
Not ideal for: Buyers seeking the highest listed efficiency in this group, a plug-in setup, or a kit that includes a power cord.
- Cooling capacity:11,500 BTU
- Listed coverage:550 sq. ft.
- Efficiency:17 SEER2
- Noise level:29 dB
- Voltage:115 V
- Refrigerant:R32
- Line set:16.42 feet
- Installation:Hardwired
- Warranty:Five-year limited
Our verdict“Choose the Rellytech for a smaller room where adjustable airflow and remote-based temperature sensing matter more than top-listed efficiency.”
Tehanld 12,000 BTU Mini Split Air Conditioner and Heat Pump, 17 SEER2, 115V, Cools Up to 750 Sq. Ft., White
The Tehanld’s standout advantage is its stated heating operation down to -4°F, giving it a wider cold-weather range than the Albott, which lists a 5°F minimum. That can matter for buyers who want one ductless system to handle shoulder seasons and colder spells, though the product details do not establish how much heating capacity it retains at that low temperature. Its 12,000 BTU capacity and coverage claim of up to 750 square feet suit a single open room or similarly sized area.
At 17 SEER2, it has a lower listed efficiency rating than the Temprium’s 22 SEER2, and its 9.8-foot line set may limit placement unless the installation plan fits. The remote, multiple modes, and ECO and Quiet settings add everyday flexibility, but professional installation is required. I’d favor it over the Albott specifically for the lower stated operating temperature, not for efficiency or warranty coverage.
Pros:- Provides both heating and cooling with 12,000 BTU capacity.
- Lists operation down to -4°F, a lower minimum than the Albott’s stated 5°F.
- Includes a remote, multiple operating modes, and Quiet, Sleep, Turbo, and ECO settings.
- Package includes a 9.8-foot copper line set.
Cons:- Its 17 SEER2 rating is lower than the Temprium’s listed 22 SEER2.
- The 9.8-foot line set may constrain indoor and outdoor unit placement.
- Requires licensed HVAC installation, and the two packages may arrive separately.
Best for: Owners of a 750-square-foot-or-smaller space who want a 115V heating and cooling system with a stated operating range extending below freezing.
Not ideal for: Buyers who prioritize the highest listed efficiency, need a longer line set, or want to avoid arranging licensed HVAC installation.
- Cooling capacity:12,000 BTU
- Efficiency:17 SEER2
- Voltage:115V
- Coverage area:Up to 750 sq. ft.
- Refrigerant:R32
- Minimum outdoor temperature:-4°F
- Operating modes:Cool, Heat, Auto, Fan, Dry
- Copper line set:9.8 ft.
Our verdict“Choose the Tehanld if its -4°F operating claim is a priority; choose a higher-efficiency alternative if energy rating matters more.”
Albott 12,000 BTU Mini Split Air Conditioner and Heater, SEER2 18, 115V
The Albott is a practical match for buyers who care about low operating noise and routine cleaning. Its stated level is below 29 dB, and the removable filters and air blades make access for upkeep more straightforward than the product details provided for the Tehanld. Self-cleaning adds another maintenance-oriented feature, though it should not be treated as a replacement for regular filter care. It covers up to 750 square feet and offers heating, cooling, dehumidifying, and fan modes.
Compared with the COSTWAY, which lists a quieter 23 dB level, the Albott’s appeal leans more on its cleaning features and stated warranty: five years for the compressor and seven for parts. Its listed operating range starts at 5°F, so the Tehanld has the lower stated cold-weather threshold. The Albott’s product information does not give an efficiency rating, making it harder to compare running efficiency. Licensed ductless installation is still part of the commitment.
Pros:- Stated noise level is below 29 dB.
- Includes self-cleaning and removable filters and air blades for easier access during upkeep.
- Provides cooling, heating, dehumidifying, and fan modes.
- Lists a 5-year compressor and 7-year parts warranty.
Cons:- Its 5°F minimum operating temperature is higher than the Tehanld’s stated -4°F.
- The supplied product details do not list a SEER2 rating.
- Requires a ductless mini-split installation.
Best for: People outfitting a bedroom, study, or small living area who value quiet operation, accessible cleaning, and stated parts and compressor warranty terms.
Not ideal for: Buyers in colder climates who need a stated operating minimum below 5°F, or shoppers comparing efficiency ratings before choosing.
- Cooling capacity:12,000 BTU
- Voltage:115V
- Coverage area:Up to 750 sq. ft.
- Operating temperature:5°F to 122°F
- Temperature settings:61°F to 90°F
- Noise level:Below 29 dB
- Modes:Cooling, heating, dehumidifying, fan
- Warranty:5-year compressor; 7-year parts
Our verdict“Pick the Albott for a quieter, maintenance-friendly setup with stated warranty coverage, but look elsewhere if low-temperature operation or efficiency data leads your decision.”
COSTWAY 12,000 BTU Mini-Split Air Conditioner and Heat Pump
The COSTWAY stands out for a clearly stated 23 dB operating noise level, which makes it a strong candidate for rooms where fan sound is a concern. Its washable filter, self-cleaning function, and auto-defrost feature give it a useful set of basic care and cold-weather operating tools. The scroll inverter compressor is designed to adjust output rather than simply cycle on and off, which can help avoid abrupt temperature swings; the product data does not specify an efficiency rating, though, so I would not rank it as an efficiency leader.
Compared with the Albott, COSTWAY lists a lower noise figure, while the Albott provides a stated warranty and removable air blades. The COSTWAY’s own warranty terms are five years for parts and eight for the compressor. A major purchasing limitation is that it requires a new compatible outdoor unit, in addition to licensed HVAC installation, so it is not a straightforward replacement if you only need an indoor unit. Its 44.5-inch width also calls for checking wall space before planning placement.
Pros:- Lists quiet operation at 23 dB.
- Includes a washable filter, self-cleaning, and auto-defrost functions.
- Provides heating and cooling with five operating modes.
- Lists an 8-year compressor and 5-year parts warranty.
Cons:- Requires a new compatible outdoor unit and licensed HVAC installation.
- The supplied specifications do not state a SEER2 rating or coverage area.
- The indoor unit is 44.5 inches wide, which may not fit every planned location.
Best for: Buyers planning a complete single-zone installation who want quiet operation, a washable filter, and included self-cleaning and auto-defrost functions.
Not ideal for: Anyone seeking an indoor-unit-only replacement, a published efficiency rating, or a narrower indoor unit for a tight wall space.
- Cooling capacity:12,000 BTU
- Functions:Cooling and heating
- Modes:Auto, cool, dry, heat, fan
- Noise level:23 dB
- Refrigerant:R-32
- Compressor:Scroll inverter
- Dimensions:9 × 44.5 × 13 in. (D × W × H)
- Warranty:5 years parts; 8 years compressor
Our verdict“Choose the COSTWAY for a quiet, feature-equipped complete system if you can accommodate its outdoor-unit requirement and wide indoor unit.”
Temprium 12,000 BTU Mini-Split Air Conditioner and Heat Pump, 115V, 22 SEER2
The Temprium is the strongest fit in this group for buyers who want both app-based control and a high listed efficiency rating. Its 22 SEER2 figure is higher than the Tehanld’s 17 SEER2, while Wi-Fi, app, remote, and voice controls offer more ways to adjust a system that may not be near the usual wall-switch location. The system is rated at 12,000 BTU cooling and 12,300 BTU heating, with coverage listed up to 750 square feet and seven modes, including Sleep and ECO.
It also lists noise as low as 23 dB, matching the COSTWAY’s stated figure, and uses a washable filter. Those features make it a capable all-rounder, but the warranty is only one year as listed—less coverage than the Albott or COSTWAY specifies. The product information also says a new compatible outdoor unit is required, and does not explain installation details. I’d choose it over the COSTWAY for connected controls and a stated efficiency rating, while weighing the shorter warranty carefully.
Pros:- Lists 22 SEER2 efficiency with inverter operation.
- Offers Wi-Fi, app, remote, and voice controls.
- Provides 12,000 BTU cooling and 12,300 BTU heating for spaces up to 750 square feet.
- Lists noise as low as 23 dB and includes a washable filter.
Cons:- The listed warranty is one year, shorter than the Albott’s and COSTWAY’s stated terms.
- Requires a new compatible outdoor unit.
- Installation details are not provided in the product information.
Best for: Tech-oriented owners of a space up to 750 square feet who want app or voice control, quiet operation, and a published SEER2 rating.
Not ideal for: Buyers who want longer listed warranty coverage, need a system with clearly detailed installation requirements, or are replacing only an indoor unit.
- Cooling capacity:12,000 BTU
- Heating capacity:12,300 BTU
- Efficiency:22 SEER2
- Voltage:115V
- Coverage area:Up to 750 sq. ft.
- Refrigerant:R-32
- Noise level:As low as 23 dB
- Controls:App, remote, voice
- Warranty:1 year
Our verdict“The Temprium is the best match here for smart controls and a high listed efficiency rating, provided its one-year warranty and outdoor-unit requirement suit your plans.”
Rellytech Mini Split AC/Heating System, 18000 BTU, 19 SEER2, 208-230V
The Rellytech earns its place by serving a different size of job than the four 12,000 BTU systems in this batch. With 18,000 BTU cooling, 18,400 BTU heating, and coverage listed up to 1,250 square feet, it is aimed at a larger open-plan area, garage, or office where a smaller unit may be undersized. Its 19 SEER2 rating also gives buyers a published efficiency figure, although it sits below the Temprium’s 22 SEER2.
This capacity comes with a wiring requirement that sharply narrows its audience: the system needs 208–230V power, unlike the 115V Tehanld and Temprium. Buyers should confirm their electrical supply and have a qualified installer assess the site before choosing it. The four modes, ECO function, and 90-degree vertical swing provide useful airflow control, but the supplied details do not state noise level, line-set contents, or warranty. I’d pick it for extra room capacity, not for a simple plug-in replacement.
Pros:- 18,000 BTU cooling and 18,400 BTU heating exceed the 12,000 BTU models in this group.
- Coverage is listed up to 1,250 square feet.
- 19 SEER2 rating is provided.
- Includes four modes, ECO operation, and 90-degree vertical swing.
Cons:- Requires 208–230V power, unlike the 115V Tehanld and Temprium.
- The supplied product details do not state noise level or warranty terms.
- Professional assessment may be needed to confirm electrical and installation suitability.
Best for: Owners of larger open rooms, garages, or offices up to the listed 1,250-square-foot coverage who have compatible 208–230V power.
Not ideal for: Buyers cooling a single smaller room, homes limited to 115V at the installation point, or anyone needing detailed noise and warranty information before selecting a system.
- Cooling capacity:18,000 BTU
- Heating capacity:18,400 BTU
- Efficiency:19 SEER2
- Voltage:208–230V
- Coverage area:Up to 1,250 sq. ft.
- Operating modes:Cooling, heating, fan, dry
- Fan speeds:High, medium, low, auto
- Air swing:90° vertical
Our verdict“Choose this Rellytech for a larger space only if you have compatible 208–230V power and can verify the installation details.”
COSTWAY 12,000 BTU Mini-Split Air Conditioner and Heat Pump, 20 SEER2, 115V
The COSTWAY suits buyers who want a 12,000 BTU heating-and-cooling system with several ways to adjust it: Wi-Fi, voice control, an app, and a remote. Its eight fan speeds and 4D airflow offer more fine-tuning than the four-speed Rellytech 12,000 BTU, while the 20 SEER2 rating gives it a middle ground between that model’s 19 SEER2 and the smaller Temprium 9,000 BTU’s 22 SEER2. The listed coverage reaches 750 square feet, but actual comfort depends on room layout and insulation. Self-cleaning and washable filters simplify routine upkeep; they do not remove the need for professional installation. At up to 28 dB, its stated noise floor is also appealing for quiet rooms, though it is not as low as Temprium’s 23 dB figure.
Choose it for control flexibility and room-size versatility, not for a quick DIY setup: professional installation is recommended, and the outdoor unit must be a new compatible one.
Pros:- Heating and cooling with a stated capacity of 12,000 BTU for each
- Wi-Fi, app, voice, and remote control provide flexible operation
- Eight fan speeds and 4D airflow allow detailed airflow adjustment
- Washable filters and self-clean function support routine maintenance
Cons:- Professional installation is recommended
- Requires a new compatible outdoor unit
- Its 20 SEER2 rating is below the 22 SEER2 Temprium 9,000 BTU
Best for: Owners of a medium-size room up to 750 square feet who want app or voice control, heating and cooling, and multiple airflow settings.
Not ideal for: DIY installers or anyone expecting to reuse an existing outdoor unit; professional installation is recommended and a new compatible outdoor unit is required.
- Cooling capacity:12,000 BTU
- Heating capacity:12,000 BTU
- Coverage area:Up to 750 sq. ft.
- Efficiency:20 SEER2
- Voltage:115 V
- Refrigerant:R-32
- Noise level:As low as 28 dB
- Controls:Wi-Fi, app, voice control, and remote
- Fan speeds:8
Our verdict“Pick the COSTWAY if you want a smart, adjustable 12,000 BTU system for a medium-size space and can arrange professional installation.”
Temprium 9000 BTU Mini Split Air Conditioner & Heat Pump, 115V, 22 SEER2, WiFi Enabled
The Temprium is the bedroom-focused pick in this group: its 9,000 BTU capacity is rated for spaces up to 450 square feet, and the stated 23 dB operation is quieter than the 28 dB minimum listed for the COSTWAY 12,000 BTU. That lower noise figure and Wi-Fi, Alexa, and Google Assistant support make it appealing where gentle operation and convenient control matter more than covering a large open area. Its 22 SEER2 rating also leads the three smaller or mid-size models compared here, ahead of the Rellytech 9,000 BTU at 19 SEER2. The tradeoff is capacity: buyers trying to condition a room closer to 550 square feet may prefer that Rellytech model, while a 750-square-foot space calls for a larger unit. Professional installation and a new outdoor unit are required.
This is a strong fit for sleeping spaces and compact rooms, but its stated coverage makes it a poor match for larger open plans.
Pros:- Stated 23 dB noise level suits noise-sensitive rooms
- 22 SEER2 rating is higher than the listed Rellytech 9,000 BTU’s 19 SEER2
- Wi-Fi control works with Alexa and Google Assistant
- Self-cleaning function and washable filters support upkeep
Cons:- Coverage is limited to a stated maximum of 450 square feet
- Requires professional installation and a new outdoor unit
- Smaller capacity is less suited to open spaces than the 12,000 BTU COSTWAY
Best for: Bedroom, nursery, or home-office owners seeking a quiet 9,000 BTU system for a room up to 450 square feet, with smart-home control.
Not ideal for: Buyers cooling a large open room or spaces beyond its stated 450-square-foot coverage, or anyone seeking a DIY installation.
- Cooling capacity:9,000 BTU
- Heating capacity:9,500 BTU
- Coverage area:Up to 450 sq. ft.
- Efficiency:22 SEER2
- Voltage:115 V
- Wattage:780 W
- Refrigerant:R-32
- Noise level:23 dB
- Connectivity:Wi-Fi, Alexa, and Google Assistant
Our verdict“Choose the Temprium for a compact bedroom or nursery where quiet operation and smart controls matter more than broad coverage.”
YITAHOME 12,000 BTU Mini-Split Air Conditioner and Heat Pump, 115V, 20 SEER2
For rooms where air needs to travel beyond the immediate indoor-unit area, the YITAHOME lists an airflow range of up to 50 feet. That gives it a distinct advantage over the COSTWAY 12,000 BTU, whose supplied specifications emphasize 4D airflow and eight speeds rather than a stated throw distance. Both offer 12,000 BTU capacity, coverage up to 750 square feet, 115 V operation, and a 20 SEER2 rating, so room layout and control preferences are stronger differentiators than headline capacity. YITAHOME adds app, remote, and voice control, plus dehumidifying, sleep, and auto-clean features. Its noise specification is below 41 dB, less precise than the COSTWAY’s listed minimum of 28 dB. Professional installation is required, and some protective hardware is excluded.
This model makes the most sense for longer or less centralized rooms; buyers prioritizing a more specific low-noise rating or more fan-speed choices may prefer COSTWAY.
Pros:- Airflow is specified to reach up to 50 feet
- 12,000 BTU capacity and coverage up to 750 square feet
- App, remote, and voice control are supported
- Includes dehumidifier, sleep, and auto-clean functions
Cons:- Licensed HVAC professional installation is required
- Noise is listed only as below 41 dB, less precise than the COSTWAY’s 28 dB minimum
- Shut-off valve housing and side protection grille are excluded
Best for: Homeowners with a medium-size room or elongated layout who want 12,000 BTU capacity and a stated airflow reach of up to 50 feet.
Not ideal for: Buyers who need a clearly lower specified noise floor, extensive fan-speed selection, or a package containing every outdoor-unit protective part.
- Cooling capacity:12,000 BTU
- Coverage:Up to 750 sq. ft.
- Efficiency:20 SEER2
- Voltage:115 V
- Wattage:1,040 W
- Airflow range:Up to 50 ft.
- Noise level:Below 41 dB
- Refrigerant:R-32
- Dimensions:7.9 in. D × 31.2 in. W × 11.5 in. H
Our verdict“Choose YITAHOME when long-reach airflow is a priority for a medium-size room and you are prepared to arrange professional installation.”
Rellytech Mini Split AC Heating System, 12,000 BTU, 19 SEER2, 115V/110V
The Rellytech 12,000 BTU pairs heating and cooling for spaces listed up to 750 square feet with an eight-year warranty and ETL/AHRI certification. Those details give it a different appeal from the similarly sized COSTWAY and YITAHOME: those models list a 20 SEER2 rating, compared with Rellytech’s 19 SEER2, while this unit’s stated warranty is a strong reason to focus on coverage terms when comparing options. Its four fan speeds and 90-degree vertical swing provide basic airflow adjustment, but fewer speed choices than COSTWAY’s eight. The stated 42 dB noise level is also higher than the minimum figures listed for COSTWAY and Temprium. ECO and sleep modes add practical scheduling and comfort choices, although the provided information does not list Wi-Fi control.
Choose this for its warranty and certified specifications, not for the highest listed efficiency or quietest operation. Professional installation is required.
Pros:- Provides 12,000 BTU cooling and 12,500 BTU heating
- Eight-year warranty is specified
- ETL and AHRI certifications are listed
- ECO and sleep modes plus 90-degree vertical swing support adjustable comfort
Cons:- 19 SEER2 rating is below the 20 SEER2 COSTWAY and YITAHOME
- 42 dB stated noise level is higher than the Temprium’s 23 dB
- Professional installation is required
Best for: Homeowners seeking a certified 12,000 BTU heating-and-cooling system for a space up to 750 square feet who place weight on the stated eight-year warranty.
Not ideal for: Noise-sensitive users or buyers who want Wi-Fi control, more than four fan speeds, or a higher listed efficiency rating than the 20 SEER2 COSTWAY and YITAHOME.
- Cooling capacity:12,000 BTU
- Heating capacity:12,500 BTU
- Coverage area:Up to 750 sq. ft.
- Efficiency:19 SEER2
- Heating efficiency:8.5 HSPF2
- Voltage:115 V/110 V
- Noise level:42 dB
- Fan speeds:4
- Warranty:8 years
Our verdict“Pick this Rellytech when the stated eight-year warranty and certifications matter more to you than smart controls, quieter operation, or a higher SEER2 figure.”
Rellytech 9,000 BTU 115V Mini Split Air Conditioner and Heat Pump
The Rellytech 9,000 BTU is a smaller-capacity alternative for buyers who want heating and cooling without stepping up to a 12,000 BTU unit. Its stated coverage reaches up to 550 square feet, wider than the Temprium 9,000 BTU’s 450-square-foot rating, though that alone cannot determine fit: insulation, climate, and layout also affect sizing. The tradeoff is efficiency and quiet operation. Rellytech lists 19 SEER2 and 42 dB, while Temprium lists 22 SEER2 and 23 dB, making Temprium the stronger choice for a bedroom where noise and efficiency are priorities. Rellytech counters with ECO and sleep modes, four fan speeds, a 24-hour timer, and an eight-year warranty. It still requires professional HVAC installation.
This is a practical match for a smaller room needing heating and cooling, especially when its stated coverage range is a better fit than Temprium’s; it is not the quietest or most efficient option here.
Pros:- Provides 9,000 BTU of both cooling and heating
- Stated coverage extends up to 550 square feet
- Includes ECO and sleep modes, four fan speeds, and a 24-hour timer
- ETL and AHRI certifications and an eight-year warranty are listed
Cons:- 19 SEER2 is below the Temprium 9,000 BTU’s 22 SEER2
- 42 dB is substantially higher than the Temprium’s stated 23 dB
- Professional HVAC installation is required
Best for: Owners of a room up to 550 square feet who want a 9,000 BTU heat pump, timer-based control, and a stated eight-year warranty.
Not ideal for: Bedroom users who prioritize minimum noise or buyers focused on higher listed efficiency; the Temprium 9,000 BTU specifies 23 dB and 22 SEER2.
- Cooling capacity:9,000 BTU
- Heating capacity:9,000 BTU
- Coverage area:Up to 550 sq. ft.
- Efficiency:19 SEER2
- Heating efficiency:8.5 HSPF2
- Voltage:115 V
- Noise level:42 dB
- Operating modes:Cooling, heating, fan, and dry
- Warranty:8 years
Our verdict“Choose this Rellytech for a 9,000 BTU system with a stated 550-square-foot reach and useful timer features, but pick Temprium for quieter operation and higher listed efficiency.”
How We Picked
I organized this roundup around the decisions that change whether a mini split will suit a home: capacity, electrical requirements, stated efficiency, and everyday usability. I compared the listed BTU outputs to show where each model may fit in the lineup, and treated manufacturer efficiency figures as a point of comparison rather than a guarantee of real-world energy use. I also looked for differentiators that are clear from the product details, such as Wi-Fi, voltage, and whether a model is offered as a heating-and-cooling system.
The ranking favors options with a useful balance of stated capabilities and a clearly defined role, rather than simply placing the highest SEER2 figure first. Models with similar capacity are distinguished by efficiency claims and listed features; smaller units are positioned for buyers who do not need a 12,000 BTU system, and the 18,000 BTU option is separated by its higher capacity and 208–230V requirement. Product names alone do not confirm installation materials, cold-climate output, warranty terms, or included services, so buyers should verify those details with the seller and a qualified installer before purchase.
| mini split air conditioner | Refrigerant | Coverage area |
|---|---|---|
| Senville LETO 12,000 BTU Mini | R-454B | — |
| Garvee 12,000 BTU 115V Mini Sp | — | — |
| Senville LETO Mini Split Air C | — | — |
| MEPTY 12000 BTU Mini Split AC | R32 | — |
| Rellytech 11500 BTU Ductless M | R32 | — |
| Tehanld 12,000 BTU Mini Split | R32 | Up to 750 sq. ft. |
| Albott 12,000 BTU Mini Split A | — | Up to 750 sq. ft. |
| COSTWAY 12,000 BTU Mini-Split | R-32 | — |
| Temprium 12,000 BTU Mini-Split | R-32 | Up to 750 sq. ft. |
| Rellytech Mini Split AC/Heatin | — | Up to 1,250 sq. ft. |
| COSTWAY 12,000 BTU Mini-Split | R-32 | Up to 750 sq. ft. |
| Temprium 9000 BTU Mini Split A | R-32 | Up to 450 sq. ft. |
| YITAHOME 12,000 BTU Mini-Split | R-32 | — |
| Rellytech Mini Split AC Heatin | — | Up to 750 sq. ft. |
| Rellytech 9,000 BTU 115V Mini | — | Up to 550 sq. ft. |
Factors to Consider When Choosing Best Mini Split Air Conditioners
Choosing among these units takes more than picking the largest BTU rating or the highest SEER2 number. I would first narrow the options by room conditions and electrical setup, then compare the features that affect daily comfort and total ownership. These checks can also prevent a mismatch between the product listing and what your home can support.
Match Capacity to the Room, Not Just the Square-Foot Claim
BTU capacity is a starting point, not a substitute for a room-by-room load estimate. Ceiling height, insulation, window area, sun exposure, air leakage, and local climate can all change the amount of heating or cooling a space needs. A 9,000 BTU unit may suit a smaller, well-insulated room, while an 18,000 BTU system can serve a larger load, but neither rating guarantees a fit by itself. Avoid choosing extra capacity as insurance: an oversized system may cycle differently and can leave humidity control less satisfactory. Ask an HVAC professional to size the system against the actual space, especially for open-plan rooms or homes with large glass areas. Use advertised square-foot coverage as a rough screening clue, not a final sizing decision.
Check Voltage and Electrical Capacity Before Ordering
The listings here include many 115V or 110V models and one 18,000 BTU Rellytech identified as 208–230V. That difference can determine whether existing wiring is suitable or a new circuit and electrical work are needed. A product’s voltage label does not tell you the full circuit requirements; check the installation manual for minimum circuit ampacity, maximum overcurrent protection, and disconnect requirements. Have an electrician verify the panel and proposed circuit before the equipment arrives. Do not assume that a standard outlet can power a 115V mini split, since many systems still require dedicated wiring. Electrical work can change the project scope enough to affect which unit is the sensible choice.
Read SEER2 as One Part of the Efficiency Picture
Among the 12,000 BTU models in this roundup, stated SEER2 ratings range from 17 to 22. A higher rating can point to more efficient cooling under standardized conditions, but it does not predict a household’s exact energy use or bill. Climate, thermostat settings, installation quality, maintenance, and how often the system runs all matter. Heating performance has its own ratings and operating limits, so a strong cooling figure does not answer whether a unit can heat comfortably in a cold winter. Compare the full product documentation, including heating capacity at lower outdoor temperatures, rather than choosing by SEER2 alone. Paying more for a higher-efficiency model is most likely to make sense when the system will run frequently over many seasons.
Plan for Installation as Part of the Equipment Choice
A ductless system still needs a properly placed indoor head, an outdoor unit location, a route for refrigerant piping and condensate drainage, and electrical work. Before selecting a model, check the listing and installation manual for line-set length, whether a line set is included, flare or connection requirements, and any extra parts the installer may need. Also confirm whether the manufacturer requires professional installation for warranty coverage. Refrigerant handling and commissioning are not casual DIY tasks; an installation mistake can undermine comfort, efficiency, or system reliability. Ask installers to quote the same scope for each candidate so equipment comparisons are not distorted by different assumptions. A unit that appears simpler on paper may not be the simpler project for your building.
Compare Controls, Noise Information, and Service Support
Control features matter most when they match how you plan to use the room. The Temprium 9,000 BTU listing names Wi-Fi, which may appeal to buyers who want remote adjustments; confirm app compatibility and whether any hub or subscription is needed. For every candidate, look for the remote-control functions, scheduling options, and published indoor and outdoor sound levels in the full specification sheet. Check filter access and cleaning instructions too, since routine maintenance affects airflow and comfort. Before ordering, verify warranty coverage, parts availability, and the process for getting service in your area. A feature-rich unit is a poor fit if support is difficult to access or basic maintenance is awkward.
Decide Whether You Need Cooling, Supplemental Heat, or Primary Heat
All the products in this roundup are presented as air conditioners with heat pumps, but that label does not mean every unit can meet a home’s heating needs in every climate. If the mini split will provide primary heat, check its rated heating capacity at low outdoor temperatures and its operating range, not only its nominal BTU rating. Defrost cycles and reduced output in cold weather can affect comfort and the need for backup heat. A system used mainly for summer cooling with occasional shoulder-season heat has a different job from one expected to heat a home through winter. Compare the specifications against local design temperatures and discuss backup options with an installer. This distinction may matter more than a small difference in stated cooling efficiency.
Frequently Asked Questions
Should I choose a 9,000 BTU or 12,000 BTU mini split for one room?
Start with a room load calculation rather than using floor area alone. A compact, shaded, well-insulated room may need less capacity than a larger room with high ceilings, strong afternoon sun, or drafty windows. This roundup includes 9,000 BTU Senville, Temprium, and Rellytech options alongside several 12,000 BTU models, but those product categories are not a sizing verdict. Ask an installer to account for the room’s construction and climate before you buy. If you are comparing two capacities, confirm the equipment’s minimum output as well as its maximum, since that affects how it operates when the load is light.
Does a 115V mini split plug into a regular household outlet?
Not necessarily. A 115V label describes the system’s voltage, but the unit may still require a dedicated circuit, a disconnect, and wiring sized to its electrical specifications. Check the installation manual for the required breaker and circuit details before assuming existing wiring will work. Have a qualified electrician inspect the proposed location and panel capacity. The 208–230V Rellytech 18,000 BTU model has a different electrical requirement from the many 115V listings, so confirm voltage early in the selection process.
Is a 22 SEER2 model always a better choice than a 17 or 19 SEER2 model?
No. A higher stated SEER2 rating can indicate greater cooling efficiency under standardized test conditions, but it does not by itself establish lower operating costs for every home. The system must also be sized correctly, installed well, and used enough for the efficiency difference to matter. If the mini split runs only occasionally, a higher-rated model may not provide enough practical benefit to outweigh other differences. Compare heating performance, electrical requirements, warranty terms, and installation needs alongside the cooling rating. The Temprium models listed at 22 SEER2 stand out on that specification, while the 19 and 20 SEER2 options may still be a better match for other project requirements.
Can a mini split heat my home during a cold winter?
It depends on the specific model’s low-temperature operating range and heating capacity, as well as the home’s heat loss. The product titles identify these systems as heat pumps, but the details provided here do not establish how much heat each one can deliver at freezing or subfreezing temperatures. Before relying on one for primary heat, find the manufacturer’s capacity data at the outdoor temperatures common in your area. Ask an HVAC professional whether backup heat is needed and how defrost operation may affect comfort. For occasional shoulder-season heating, the required performance may be different from a whole-winter heating plan.
What should I verify before ordering a mini split online?
Confirm the exact model number, capacity, voltage, included line set, and installation requirements in the listing and manual. Check who is responsible for installation, whether professional commissioning is required, and how that requirement affects warranty coverage. Ask an installer to review the electrical setup and the proposed indoor and outdoor unit locations before delivery. Also verify local permitting rules, parts and service access, and return conditions for a large installed appliance. These checks are especially useful when several listings share a brand and capacity but differ in efficiency, voltage, or features.
Conclusion
For a balanced starting point, I recommend the Senville LETO 12,000 BTU as the best overall choice in this lineup, while reminding buyers to confirm its full specifications and installation requirements. The MEPTY 12,000 BTU, 19 SEER2 is a sensible value-minded pick for shoppers seeking a listed 115V system without prioritizing the lineup’s highest efficiency figure. For a best premium direction, compare the Temprium 12,000 BTU, 22 SEER2 with the COSTWAY 12,000 BTU, 20 SEER2, then choose based on verified features, warranty, and installer feedback rather than efficiency alone. Beginners may prefer a clearly documented 115V, 12,000 BTU model and should have an installer confirm fit before ordering; the YITAHOME 12,000 BTU, 20 SEER2 is another listing to compare in that group. For smaller rooms, review the 9,000 BTU Senville, Temprium, and Rellytech options, with Wi-Fi specifically listed for the Temprium; for a larger load, investigate the 18,000 BTU Rellytech and its 208–230V electrical needs. My final choice would be the model that fits the room and wiring, with published heating data and support that meet the project’s demands.
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