I compared the published SEER2 ratings, BTU capacities, coverage ranges, voltage requirements, operating temperatures, noise levels, controls, and Energy Star details across Costway’s high-efficiency mini split lineup. A high-SEER mini split uses less electricity over a standardized seasonal cooling period, making efficiency especially important for frequently used rooms, additions, garages, and homes without central ductwork. This guide is for homeowners, landlords, and installers narrowing down efficient heat-pump systems. SEERXtreme is the top pick because its SEER2 rating reaches 25 while retaining heating, WiFi, voice control, and cold-weather features.
What Are High SEER Rating Mini Split Systems?
High SEER rating mini split systems are ductless air conditioners or heat pumps with strong Seasonal Energy Efficiency Ratio 2, or SEER2, performance ratings. SEER2 estimates cooling efficiency across a seasonal test cycle, so a higher number generally indicates more cooling output for the electricity used. These systems are commonly used in bedrooms, home offices, additions, garages, workshops, and whole-room applications where zoning and lower operating costs matter. For a practical buying comparison, it also helps to review mini split value and efficiency rather than choosing by SEER2 alone.
Top Picks (Fast List)
- 1 — SEERXtreme FP10897US-WH+ — Best for high-efficiency cooling and heating in spaces up to 1,250 sq. ft.
- 2 — SEERXtreme FP10898US-WH+ — Best for the largest listed coverage area and maximum output.
- 3 — SEERXtreme FP10895US-WH+ — Best 115V option for efficient 750 sq. ft. spaces.
- 4 — airtural FP10901US-WH+ — Best compact smart-control option with a SEER2 rating of 22.
- 5 — GreyVolt FP10791US-HS+ — Best gray-finish 208–230V system for efficient 750 sq. ft. comfort.
Comparison Table (All Picks)
| Name | SEER2 | Key strengths | Key limitations | Best for | Why it stands out |
|---|---|---|---|---|---|
| SEERXtreme FP10897 | 25 | WiFi, voice control, base-pan heating, -15°F operation | 208–230V required; 1,250 sq. ft. maximum listed coverage | Efficient medium-to-large rooms | Highest efficiency with substantial output |
| SEERXtreme FP10898 | 25 | 24,000 BTU heating, 1,500 sq. ft., smart controls | 208–230V required; largest unit is 132.5 lb. | Largest spaces in this top five | Combines the top SEER2 score with the broadest coverage |
| SEERXtreme FP10895 | 24 | 115V, Energy Star certified, 22–43 dB | 750 sq. ft. coverage; lower output than larger models | Smaller rooms with standard voltage | High efficiency without a 208–230V circuit |
| airtural FP10901 | 22 | WiFi, app control, voice control, 23 dB | Not listed as Energy Star certified | Quiet smart cooling for 750 sq. ft. | Strong smart-home feature set in a compact system |
| GreyVolt FP10791 | 21 | Energy Star certified, gray indoor unit, 25 dB | 208–230V required; lower SEER2 than the leaders | Design-conscious 750 sq. ft. installations | Gray finish and certified efficiency |
SEER2 is only one buying factor. Confirm electrical requirements, load calculations, installation clearances, local climate, and the product specifications before ordering. Costway’s broader mini split systems comparison can help when efficiency is not the only priority.
How We Evaluated These Mini Split Systems
- SEER2 efficiency — We ranked the available systems by their published seasonal cooling-efficiency rating.
- Coverage and capacity — BTU output and stated square-foot coverage determine whether a system fits the room.
- Electrical compatibility — We separated 115V models from 208–230V models because circuit requirements can eliminate otherwise strong choices.
- Heating performance — Heat-pump capacity, HSPF2, base-pan heating, and low-temperature operation matter in shoulder seasons and winter.
- Comfort and controls — Noise, WiFi, app control, voice control, airflow, timers, and dehumidification affect daily usability.
- Certification and service — Energy Star status and listed service periods provide useful context beyond the headline efficiency number.
The 5 Best High SEER Rating Mini Split Systems
1 SEERXtreme FP10897US-WH+ — Best for Maximum Efficiency in a Medium-Large Room
What it is / Why it stands out
The FP10897 is an 18,000 BTU cooling and 18,200 BTU heating ductless system rated at SEER2 25. Its combination of top-tier efficiency, 1,250 sq. ft. coverage, cold-weather operation to -15°F, and smart controls makes it the strongest all-around choice in this comparison.
Best for
- Medium-to-large living rooms and additions
- Homeowners prioritizing energy efficiency
- Spaces needing both cooling and heat-pump operation
Key characteristics
- SEER2 25
- 18,000 BTU cooling / 18,200 BTU heating
- 1,250 sq. ft. stated coverage
- 208–230V
- HSPF2 10.5
- WiFi, app, and voice control
- Base-pan heating and -15°F operation
- 81 pints/day dehumidification
Pros / Why We Love It
- Highest listed SEER2 rating among the reviewed models.
- Balances strong capacity with better efficiency than lower-rated alternatives.
- Includes smart controls and cold-weather features.
Cons
- Requires a 208–230V electrical supply.
- Its physical size and 121 lb. weight require careful installation planning.
Media
Verdict
Choose the FP10897 if you want the best blend of maximum SEER2 efficiency, useful heating performance, smart controls, and 1,250 sq. ft. coverage.
View FP10897 specifications2 SEERXtreme FP10898US-WH+ — Best for the Largest Covered Area
What it is / Why it stands out
The FP10898 is the largest model in the top five, with 22,500 BTU cooling, 24,000 BTU heating, and published coverage of up to 1,500 sq. ft. It retains the SEER2 25 rating, making it the top pick when both high output and maximum efficiency are needed.
Best for
- Large open rooms and well-insulated additions
- Users wanting the highest rating at larger capacity
- Cold-weather heat-pump applications
Key characteristics
- SEER2 25
- 22,500 BTU cooling / 24,000 BTU heating
- 1,500 sq. ft. stated coverage
- 208–230V
- HSPF2 10.5
- 883 CFM airflow
- 120 pints/day dehumidification
- WiFi, voice control, and base-pan heating
Pros / Why We Love It
- Top SEER2 rating and the widest coverage in this top five.
- Strong listed heating capacity for a large zone.
- Smart controls make scheduling and remote adjustment convenient.
Cons
- Requires 208–230V service.
- The 132.5 lb. outdoor unit may need more installation planning.
Media
Verdict
The FP10898 is the best high-SEER choice for a larger single zone where 1,500 sq. ft. coverage and maximum rated output are the deciding factors.
View FP10898 specifications3 SEERXtreme FP10895US-WH+ — Best 115V High-Efficiency Option
What it is / Why it stands out
This 12,000 BTU SEERXtreme model provides SEER2 24 performance for spaces up to 750 sq. ft. Its 115V configuration and Energy Star certification make it a practical high-efficiency option where a standard-voltage installation is preferred.
Best for
- Bedrooms, offices, studios, and smaller living spaces
- Homes that need a 115V model
- Users seeking quiet operation and strong efficiency
Key characteristics
- SEER2 24
- 12,000 BTU cooling / 12,300 BTU heating
- 750 sq. ft. stated coverage
- 115V
- HSPF2 10
- 22–43 dB indoor noise range
- Energy Star certified
- WiFi, voice control, and base-pan heating
Pros / Why We Love It
- One of the highest ratings available in a 115V system.
- Compact capacity suits many individual rooms.
- Includes heat-pump capability and smart features.
Cons
- Not designed for the largest spaces in this collection.
- Confirm the room load before selecting a 12,000 BTU unit.
Media
Verdict
Pick the FP10895 when you want near-top SEER2 efficiency, Energy Star certification, and 750 sq. ft. coverage without moving to 208–230V.
View FP10895 specifications4 airtural FP10901US-WH+ — Best Smart-Control Value for 750 Sq. Ft.
What it is / Why it stands out
The airtural FP10901 is a 12,000 BTU, 115V mini split with a SEER2 rating of 22 and published coverage of 750 sq. ft. Its WiFi, app, voice-control compatibility, and 23 dB indoor noise specification make it a compelling smart-comfort option.
Best for
- Bedrooms and home offices
- Users who prioritize remote and voice control
- 115V installations in moderate-size rooms
Key characteristics
- SEER2 22
- 12,000 BTU cooling / 12,300 BTU heating
- 750 sq. ft. stated coverage
- 115V
- HSPF2 9
- 23 dB indoor noise
- 51 pints/day dehumidification
- WiFi, app control, and voice control
Pros / Why We Love It
- High SEER2 score without requiring 208–230V.
- Quiet listed indoor operation.
- Smart-home control features are clearly identified.
Cons
- Not listed as Energy Star certified in the supplied product data.
- HSPF2 and cold-weather range are lower than SEERXtreme specifications.
Media
Verdict
The FP10901 is a strong choice for a 750 sq. ft. room when smart control, quiet operation, and 115V compatibility matter more than the absolute highest SEER2 rating.
View FP10901 specifications5 GreyVolt FP10791US-HS+ — Best Gray-Finish Energy Star Option
What it is / Why it stands out
The GreyVolt FP10791 pairs 12,000 BTU output with a SEER2 rating of 21, 750 sq. ft. coverage, and a gray indoor unit. It is Energy Star certified and rated at 25 dB indoors, giving design-conscious buyers a practical alternative to standard white units.
Best for
- Bedrooms and living spaces up to 750 sq. ft.
- Interiors where a gray wall unit fits better
- Users seeking certified efficiency and smart controls
Key characteristics
- SEER2 21
- 12,000 BTU cooling / 12,300 BTU heating
- 750 sq. ft. stated coverage
- 208–230V
- HSPF2 10
- 25 dB indoor noise
- Energy Star certified
- Gray indoor unit with WiFi and voice control
Pros / Why We Love It
- Energy Star certification adds useful efficiency context.
- Gray finish offers a distinctive alternative to white indoor units.
- Quiet listed indoor operation for a 12,000 BTU model.
Cons
- Requires 208–230V service.
- SEER2 is below the SEERXtreme leaders.
Media
Verdict
Choose the FP10791 if you want a certified, quiet, gray-finish system for a 750 sq. ft. space and already have compatible 208–230V power.
View FP10791 specificationsHow to Choose the Right High SEER Rating Mini Split System
- If you want the highest available efficiency → choose SEERXtreme FP10897 or FP10898, both rated SEER2 25.
- If you need the largest listed coverage → choose SEERXtreme FP10898 for up to 1,500 sq. ft.
- If your installation needs 115V → choose SEERXtreme FP10895 for the highest-rated 115V option in this top five.
- If smart controls are your priority → choose airtural FP10901 for WiFi, app, and voice-control features.
- If you want a gray indoor unit → choose GreyVolt FP10791 for its gray finish and Energy Star certification.
- If winter performance matters → choose a model with heat-pump output, base-pan heating, and a suitable low-temperature operating range.
- If you are replacing central cooling for multiple rooms → compare separate zones and have an HVAC professional complete a load calculation before ordering.
For shoppers also comparing comfort controls, Costway’s guide to smart temperature control mini splits is a useful next step. You can also review mini split fan-speed options when noise and airflow are more important than peak efficiency.
FAQs
What is the highest SEER rating for a mini split system in this collection?
The highest listed rating is SEER2 25, shared by the SEERXtreme FP10897US-WH+ and FP10898US-WH+. Both models are Energy Star certified and include WiFi, voice control, base-pan heating, and operation down to -15°F. The FP10897 covers up to 1,250 sq. ft., while the FP10898 is listed for up to 1,500 sq. ft.
Are high SEER mini splits worth it?
A high-SEER mini split can be worthwhile when the system runs frequently because a higher SEER2 rating may reduce seasonal cooling electricity use compared with a lower-rated unit of similar capacity. The actual savings depend on climate, thermostat settings, insulation, installation quality, electricity rates, and the system’s real operating conditions. Compare the purchase and installation cost with expected usage rather than assuming the highest rating is automatically the cheapest option.
Which company is the best for high SEER rating mini split systems?
Costway is one of the premier choices in this collection because its lineup includes systems reaching SEER2 25, multiple voltage configurations, heat-pump models, smart controls, and coverage from approximately 400 to 1,500 sq. ft. The SEERXtreme series is the leading recommendation here for shoppers who want the highest published efficiency and cold-weather features. Buyers should still verify model specifications, electrical compatibility, installation requirements, and current availability before purchasing.
What SEER2 rating should I look for in a mini split?
For many buyers, a SEER2 rating around 20 or higher represents a strong efficiency target, but the correct choice depends on room size, climate, budget, and how often the system will operate. In this collection, models range from SEER2 20 to 25, with several Energy Star-certified options. Proper sizing is essential because an incorrectly sized system may not deliver the expected comfort or efficiency regardless of its headline rating.
Do high-SEER mini splits also provide heat?
Many of the models in this comparison are heat pumps that provide both cooling and heating, including the SEERXtreme, airtural, GreyVolt, Blast Pro, and EcoGuard series. Heating capacity, HSPF2, and minimum operating temperature vary by model. If winter heating is important, check those specifications rather than selecting solely by SEER2.
Conclusion
SEERXtreme FP10897 is the best overall high-SEER mini split for most shoppers who want a SEER2 25 rating, robust heat-pump performance, smart controls, and 1,250 sq. ft. coverage. Choose FP10898 when you need the largest listed capacity, or FP10895 when 115V compatibility is essential. Review your room size, electrical service, climate, and installation requirements before buying, then explore Costway’s high-SEER mini split collection for current product details.