A ductless mini split can heat and cool a room without extending your home’s ductwork, but the right choice depends on the space, electrical service, climate, and installation plan. The options below range from 12,000-BTU systems for rooms listed at up to 750 square feet to a 24,000-BTU model designed for larger areas. Compare their stated capacity, efficiency, controls, and installation requirements before choosing; a qualified HVAC professional can help confirm the size your home needs.
Table of Contents
Quick Comparison
| Product | Capacity and stated coverage | Efficiency | Notable feature | Installation note |
|---|---|---|---|---|
| Rellytech 12,000 BTU Mini Split | 12,000 BTU; up to 750 sq. ft. | 19 SEER2; 8.5 HSPF2 | 115V/110V operation and sleep features | Professional installation required |
| Senville LETO 12,000 BTU Mini Split | 12,000 BTU; coverage not stated | Not stated in supplied specifications | Alexa compatibility and heat-pump operation down to 5°F | Professional installation required |
| MRCOOL DIY Select 24,000 BTU Mini Split | 24,000 BTU; up to 1,050 sq. ft. | Up to 16.5 SEER2; up to 8.3 HSPF2 | Pre-charged Quick Connect line set | Designed for DIY installation |
| Upstreman 12,000 BTU Mini Split | 12,000 BTU; up to 750 sq. ft. | 20 SEER2 | Wi-Fi control and included mounting brackets | Confirm installation needs and 230V service |
| Climate Choice 12,000 BTU Mini Split | 12,000 BTU; up to 750 sq. ft. | 19 SEER2; 8.5 HSPF2 | Sleep, mute, and display-off features | Installation details are not fully stated |
Our Picks: Best Ductless Mini Split For Home reviews
Rellytech 12,000 BTU: A Feature-Rich Option for a Mid-Size Room
The Rellytech is a single-zone ductless heat pump rated at 12,000 BTU for cooling and 12,500 BTU for heating. The supplied specifications list coverage up to 750 square feet, making it a possible fit for a bedroom, living room, office, or garage when the space and local climate match the unit’s capacity.
It runs on 115V/110V power, which may make it worth considering if you are comparing systems with different electrical requirements. Its listed efficiency is 19 SEER2 and 8.5 HSPF2. Cooling, heating, fan, and dry modes provide basic year-round control, while ECO mode is intended to optimize energy use. Four fan speeds, a 90-degree vertical swing, a timer, sleep mode, and a display-off function give you several ways to adjust comfort.
The listed sound level is 42 dB. That figure can help with comparison, but actual noise depends on operating mode, installation, and room conditions. The product information calls for professional HVAC installation and lists ETL and AHRI certifications plus an eight-year warranty. Check the warranty terms and confirm the electrical requirements with your installer before ordering. Availability may also change, so check the current product listing.
Compared with the other 12,000-BTU options here, Rellytech stands out for its stated 115V/110V power and the combination of efficiency and sleep features. It does not list Wi-Fi or voice-assistant control, so it may be less appealing if app control is a priority.
Pros:
- 12,000-BTU cooling and 12,500-BTU heating capacity
- Listed coverage of up to 750 square feet
- 19 SEER2 and 8.5 HSPF2 ratings
- Sleep mode, timer, ECO mode, and display-off feature
Cons:
- Professional HVAC installation is required
- Wi-Fi or voice control is not listed in the supplied specifications
Verdict: Consider the Rellytech if its 115V/110V requirement fits your home and you want a 12,000-BTU heat pump with several comfort modes; confirm availability and installation details first.
Senville LETO: A Smart-Control Pick With Cold-Weather Heating Details
The Senville LETO is a 12,000-BTU wall-mounted mini split with cooling, heat-pump, dehumidifying, fan, and turbo functions. Its standout feature is Alexa compatibility, which lets you control the system through voice commands or an app. That can be useful if you want to adjust settings remotely or add temperature changes to routines.
The manufacturer information says the heat pump functions down to 5°F (-15°C). That gives shoppers in colder regions a specific operating point to compare, but it is not a substitute for checking how much heat the unit can deliver at low outdoor temperatures or whether it can meet your home’s heating needs. The supplied product details do not state an efficiency rating or room coverage, so compare those points with your installer before deciding.
The package includes an indoor air handler, outdoor condenser, remote, a 16-foot line set, and communication wire. The system is pre-loaded with refrigerant for up to 25 feet of line set, according to the supplied information. Professional installation is required. Its five-year parts and compressor warranty is listed separately from labor, which is not included.
Compared with the Rellytech and Climate Choice models, the Senville puts more emphasis on connected control and gives a stated cold-weather operating point. Its missing efficiency and coverage details make it harder to compare on operating cost or room size from the supplied specifications alone.
Pros:
- Alexa compatibility and app-based control
- Cooling, heating, dehumidifying, fan, and turbo functions
- Heat-pump function listed down to 5°F (-15°C)
- Installation kit includes a 16-foot line set and communication wire
Cons:
- Professional installation is required, and labor is not included in the stated warranty
- Efficiency rating and recommended room coverage are not stated in the supplied details
Verdict: The Senville is a strong candidate if Alexa control and a stated low-temperature heating point matter to you, but get its sizing and efficiency details confirmed before purchase.
MRCOOL DIY Select 24,000 BTU: Higher Capacity for Larger Spaces
With 24,000 BTU of capacity and stated coverage up to 1,050 square feet, the MRCOOL DIY Select is the largest system in this group. It is designed for a larger room, addition, office, or shop where a 12,000-BTU unit may not be the right match. Room size alone does not determine the correct capacity, so have the heating and cooling load assessed before choosing a larger system.
This 230V heat pump uses inverter-driven operation and is rated up to 16.5 SEER2 and 8.3 HSPF2. The included pre-charged Quick Connect line set is intended to simplify installation without a vacuum pump, gauges, brazing, or refrigerant handling. It is marketed as a DIY system, but you should still follow the installation instructions and check local permit, code, and electrical requirements before taking on the work.
Smart control is available through the MRCOOL Comfort App and voice assistants. The listed silent-mode sound level is as low as 21.5 dB(A), though real-world sound can vary with the selected mode and installation. The product uses R-454B refrigerant, according to its supplied description.
Compared with the 12,000-BTU options, the MRCOOL offers more capacity and a DIY-oriented connection system, but it also requires 230V power. Its efficiency ratings are lower than the stated SEER2 and HSPF2 figures for Rellytech and Climate Choice, so compare the full system specifications and your expected heating and cooling needs rather than focusing on capacity alone.
Pros:
- 24,000 BTU with stated coverage up to 1,050 square feet
- Pre-charged Quick Connect line set is designed to simplify installation
- App and voice-assistant control
- Quiet mode listed as low as 21.5 dB(A)
Cons:
- Requires 230V power
- Its larger capacity may be unsuitable for smaller spaces; have the load sized first
Verdict: Choose the MRCOOL DIY Select if you need a higher-capacity system and want its Quick Connect installation approach, provided your electrical setup and local rules support it.
Upstreman 12,000 BTU: App Control, 20 SEER2, and Included Brackets
The Upstreman is a 12,000-BTU mini split rated for spaces up to 750 square feet. Its listed 20 SEER2 rating is the highest stated cooling-efficiency figure among the products in this comparison. It uses inverter technology and R32 refrigerant, and the product description lists an operating range from -4°F to 122°F. Check with the manufacturer or installer how those conditions apply to heating and cooling performance in your climate.
For everyday control, it connects to Wi-Fi and the Smart Life app. The system offers seven modes, including heating, cooling, dry, sleep, and ECO, plus six fan speeds, a 24-hour timer, and four-way airflow. The listing also describes an automatic display shutoff, child lock, self-cleaning function, and automatic defrost. These features offer flexible control, but you may not need all of them in a simple single-room setup.
The unit requires 230V power, which is an important planning detail. The supplied description says heavy-duty, waterproof mounting brackets are included, so you may not need to source those separately. It does not clearly establish that the system can be installed without professional help; confirm installation requirements before buying rather than assuming the “DIY” wording means every part of installation is a do-it-yourself task.
Compared with the Rellytech and Climate Choice models, Upstreman has a slightly higher stated SEER2 figure and adds app control, but it requires 230V rather than the 115V/110V listed for those models. Its silver finish may also suit shoppers looking for a different appearance from a standard white indoor unit.
Pros:
- 20 SEER2 rating and inverter operation
- Wi-Fi control through the Smart Life app
- Seven modes, six fan speeds, and four-way airflow
- Mounting brackets are listed as included
Cons:
- Requires 230V power
- Installation requirements should be confirmed before purchase
Verdict: The Upstreman is worth considering if you want app control, a 20 SEER2 rating, and included brackets, and your home can support its 230V requirement.
Climate Choice 12,000 BTU: Quiet-Mode Features for Bedrooms and Workspaces
This 12,000-BTU mini split is listed for spaces up to 750 square feet and includes cooling, heating, dry, fan, sleep, and ECO modes. Its specifications list 19 SEER2 and 8.5 HSPF2, along with inverter operation. The supplied product information describes a 115V/110V system, which is worth checking against your electrical service before purchase.
Quiet-oriented features are a key part of its design. Sleep mode is listed at under 35 dB, and the system also includes mute, a 24-hour timer, and a display-blackout function. Four fan speeds and a 90-degree vertical swing let you adjust airflow. The product description also states that the outdoor unit uses weather-resistant materials, though it does not provide a detailed temperature operating range.
There is a naming inconsistency in the supplied product information: the brand field says Climate Choice, while the description refers to LifePLus. Confirm the exact listing, included components, installation requirements, and warranty details before ordering. The available specifications do not clearly establish whether professional installation is required, so ask the seller or an HVAC installer.
Compared with Rellytech, this model has a lower listed sleep-mode sound level and similar stated efficiency figures, but its supplied description provides less detail about certification and warranty. It does not list app or voice control, unlike the Senville and Upstreman options.
Pros:
- 19 SEER2 and 8.5 HSPF2 ratings
- Listed for spaces up to 750 square feet
- Sleep mode under 35 dB, plus mute and display blackout
- Six operating modes and a 24-hour timer
Cons:
- Brand naming differs between the supplied product details
- Installation requirements and warranty terms are not fully stated
Verdict: Consider this Climate Choice model if quiet-mode features and its stated efficiency suit your needs, but verify the product identity and installation details before buying.
How to Choose a Ductless Mini Split for Your Home
Match the Capacity to the Room and Its Heat Load
BTU capacity is a starting point, not a complete sizing method. The products here range from 12,000 BTU, with several listings stating coverage up to 750 square feet, to a 24,000-BTU system listed for up to 1,050 square feet. Those coverage figures are not guarantees for every home. Ceiling height, insulation, windows, sun exposure, room layout, and local weather all affect heating and cooling needs. Ask an HVAC professional to perform a load calculation rather than choosing by floor area alone.
Check the Electrical Requirements Before You Buy
Electrical service can narrow your options quickly. Rellytech and Climate Choice list 115V/110V power, while MRCOOL DIY Select and Upstreman specify 230V. Do not assume an existing outlet or circuit is suitable. Have a qualified electrician or installer check the required circuit, breaker, wiring, and disconnect before ordering.
Compare Efficiency Ratings in Context
SEER2 measures cooling efficiency, while HSPF2 relates to heat-pump heating efficiency. Among these products, Rellytech and Climate Choice list 19 SEER2 and 8.5 HSPF2; Upstreman lists 20 SEER2; and MRCOOL lists up to 16.5 SEER2 and up to 8.3 HSPF2. The supplied Senville details do not include either rating. Compare complete system specifications, and remember that actual energy use also depends on climate, installation, settings, and how often you run the system.
Think About Winter Performance in Your Climate
A heat pump’s ability to provide useful heat in cold weather matters if it will be your main source of heating. Senville lists heat-pump function down to 5°F, while Upstreman gives an operating range from -4°F to 122°F without specifying how that range maps to each mode. Other product details do not provide a clear low-temperature heating point. Ask for performance information at the outdoor temperatures typical in your area, and consider whether you need a backup heat source.
Choose the Control Features You Will Actually Use
App and voice controls can help if you want to change settings remotely or connect the unit to routines. Senville lists Alexa compatibility, MRCOOL lists app and voice-assistant control, and Upstreman lists Wi-Fi control through the Smart Life app. Rellytech and Climate Choice emphasize remote, timer, ECO, and sleep functions instead. Extra features are useful only if they match the way you plan to use the system.
Understand the Installation Work
Most split systems have an indoor unit, an outdoor unit, refrigerant lines, electrical connections, and a path through the wall. Rellytech and Senville state that professional installation is required. MRCOOL’s Quick Connect line set is designed for DIY installation without several common refrigerant-service tools, but you still need to follow instructions and local rules. For the other models, confirm whether professional installation is required and what is included before purchase. Installation costs and permits are not specified in the product details.
Check Line-Set Details, Warranty, and Included Parts
The Senville package lists a 16-foot line set and communication wire, with refrigerant pre-loaded for up to 25 feet of line set. MRCOOL lists a pre-charged Quick Connect line set. Check the length and included parts for any model against the location of your indoor and outdoor units, and ask an installer about any additional materials. Also read the full warranty terms: Senville lists five years for parts and the compressor, while Rellytech lists an eight-year warranty. Confirm what each warranty covers, who handles service, and whether labor is included.
Consider Noise, Airflow, and Placement
Noise ratings and comfort features can matter in bedrooms, offices, and quiet living areas. The product details list sleep-mode levels of under 35 dB for Climate Choice, 42 dB for Rellytech, and as low as 21.5 dB(A) in silent mode for MRCOOL. These figures are not necessarily measured under the same conditions, so use them as a guide rather than a direct comparison. Placement also matters: make sure the indoor unit can distribute air across the room without blowing directly on a bed or work area.
Frequently Asked Questions
What size mini split do I need for my home?
It depends on the room’s heating and cooling load, not only its square footage. The listings give coverage estimates, but insulation, windows, ceiling height, sunlight, layout, and climate can change the right capacity. Ask an HVAC professional to size the system for your space.
Can a ductless mini split heat as well as cool?
Each system in this comparison is described as a heat-pump or heating-and-cooling unit. Cold-weather performance differs by model. Check the listed operating details and ask whether the unit can meet your heating needs at the outdoor temperatures common in your area.
Do mini splits need professional installation?
Rellytech and Senville explicitly call for professional HVAC installation. MRCOOL is designed for DIY installation with its Quick Connect line set, but local permits, electrical work, and installation rules still apply. Confirm the instructions and requirements for the specific model before starting work.
Can I install a mini split myself?
Some systems are designed with DIY installation in mind, including the MRCOOL model in this comparison. That does not mean every installation is suitable for a homeowner or exempt from local codes. Check the manufacturer’s instructions, permit requirements, and electrical needs before deciding.
Do I need 115V or 230V power?
It depends on the system. Rellytech and Climate Choice list 115V/110V, while MRCOOL DIY Select and Upstreman list 230V. Check the product specifications and have your electrical service assessed before purchasing.
Are mini splits energy efficient?
These systems use heat-pump and, in several cases, inverter technology. The supplied SEER2 and HSPF2 ratings offer a way to compare listed efficiency, but real energy use varies with climate, sizing, installation, and use. Choose a properly sized unit and compare the complete specifications rather than relying on a single feature.
Is a mini split a good choice for one room?
A single-zone mini split can be a practical option for a room, addition, or other area that lacks ductwork. Check that the capacity suits the space and that the indoor and outdoor units can be installed in suitable locations. For several rooms, ask whether one single-zone unit or a multi-zone system better fits your home.
Final Recommendation
For a typical single room, start by comparing the 12,000-BTU options against a professional load calculation and your electrical service. Upstreman offers the highest stated SEER2 rating and app control, while Rellytech and Climate Choice list 115V/110V operation and strong efficiency figures. Senville is the clearest fit for shoppers who value Alexa control and a stated low-temperature heating point. For a larger space, consider the 24,000-BTU MRCOOL DIY Select only if its capacity, 230V requirement, and installation approach suit your project. Check current listing details and have an installer confirm fit before you buy.
