8 Most Efficient Mini Splits (2026): Maximum Energy Savings
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Energy efficiency powers 2026’s top mini splits, minimizing electricity use while maximizing comfort. High SEER and HSPF ratings define the most efficient models, cutting costs across BTU ranges. I’ve selected eight standout mini splits to detail their efficiency specs: SEER, HSPF and more, offering data-driven insights for your choice.
Efficiency Highlights: Top 8 Mini Splits
Below are eight of 2026’s most efficient mini splits, excelling in SEER and HSPF across capacities. Specs guide your decision.
| Model | BTU | SEER | HSPF | Energy Saving Features | Price Range* |
|---|---|---|---|---|---|
| Mitsubishi MSZ-FS06NA | 6,000 | 32.2 | 11.9 | Econo Cool, 3D i-see Sensor, Check Filter Status | $2,000-$2,100 |
| Fujitsu 09LZBS1 | 9,000 | 33.1 | 13.4 | Economy Mode, Energy Saver Mode, Energy Saving Program (ESP) | $1,900-$2,200 |
| Fujitsu 12LZBS1 | 12,000 | 29.4 | 12.9 | Economy Mode, Energy Saver Mode, Energy Saving Program (ESP) | $2,200-$2,400 |
| Fujitsu 15LZBS1 | 15,000 | 25.3 | 12.8 | Economy Mode, Energy Saver Mode, Energy Saving Program (ESP) | $2,300-$2,500 |
| Cooper & Hunter Olivia 18K | 18,000 | 24 | 10.5 | ECO Mode, WiFi Control (built-in), Follow Me | $1,500-$1,600 |
| LG ArtCool Premier 24K | 24,000 | 23 | 10 | Active Energy Control (AEC), kW Manager, Low Refrigerant Detection | $2,800-$3,000 |
| Cooper & Hunter Oliva 30K | 30,000 | 21 | 8.2 | ECO Mode, WiFi Control (built-in), Follow Me | $2,100-$2,200 |
| Della Versa 36K | 36,000 | 19 | 8.5 | ECO Mode, WiFi Control (built-in), Smart Geo Location | $2,100-$2,200 |
* Prices as of 2 April 2025. Always check and compare prices from multiple retailers to get the best deal.
What Makes a Mini Split Efficient?
The efficiency of a mini split is measured by SEER and HSPF. The former tells the cooling efficiency and the latter tells the heating efficiency over a season (summer/winter). The higher the value of SEER and HSPF, the greater the efficiency.
SEER stands for Seasonal Energy Efficiency Ratio. Currently, mini splits are rated based on the second version of SEER which is the SEER2. In general, SEER2 is slightly lower than the previous SEER due to stricter test conditions.
HSPF stands for Heating Seasonal Performance Factor. Similarly, the latest version is HSPF2. In addition, HSPF is further separated into region IV milder climates and region V for colder regions.
The efficiency ratings in this post is based on SEER2 and HSPF2-IV. They are cross-checked at AHRI directory to ensure the marketed values are tally with the certified values.
Here are the 9,000 BTU efficiency benchmarks for quick comparison:
- Low efficiency: 16-19 SEER
- Mid efficiency: 20-24 SEER
- High efficiency: 25-33 SEER
Generally, high SEER rating mini splits are also high in HSPF rating. However, not all of them have equal “SEER-to-HSPF” ratio. Therefore, if you need a mini split primarily for heating, prioritize high HSPF models.
The higher the BTU, the lower the SEER and HSPF ratings. Hence, we need to compare the efficiency in the context of same BTU class, detailed below.
Most Efficient 6000 BTU: Mitsubishi MSZ-FS06NA (32.2 SEER)
- BTU: 6,000
- SEER: 32.2
- HSPF: 11.9
- Heating: Down to minus 13°F
- Coverage: 200-300 sqft
The Mitsubishi MSZ-FS06NA is the most efficient 6000 BTU mini split. Its 32.2 SEER rating is almost 1.5 times higher than the last place (21.6 SEER). Its 11.9 HSPF rating is outstanding, though not the highest.
Energy Saving Features:
- Econo Cool mode increases discharge air temperature without any loss in comfort, achieving an additional 20% energy efficiency.
- 3D i-see Sensor reduces power consumption when no occupancy is detected.
- Check Filter Status via the Kumo Cloud app to alert on dirty filter, maintaining its high efficiency at all time.
In a 200-sqft room, the Mitsubishi MSZ-FS06NA saves you the most energy. If you need an all-season cooling and heating solution for your playroom, home office, or grow room, this model is an excellent choice.
Most Efficient 9000 BTU: Fujitsu 09LZBS1 (33.1 SEER)
- BTU: 9,000
- SEER: 33.1
- HSPF: 13.4
- Heating: Down to minus 5°F
- Coverage: 300-450 sqft
- Price Range: $1,900-$2,200 (no kit)
The Fujitsu AIRSTAGE 09LZBS1 is the most efficient 9000 BTU mini split. Its 33.1 SEER rating is more than doubled the efficiency of the last place (16 SEER). Its 13.4 HSPF rating is among the highest.
Energy Saving Features:
- Economy mode automatically changes thermostat setting to avoid unnecessary cooling and heating.
- Energy Saver mode keeps room cool enough for comfort, reducing power consumption.
- Energy Saving Program (ESP) reduces energy consumption in unoccupied zones.
In a 250-sqft living room, the Fujitsu AIRSTAGE 09LZBS1 provides unmatched comfort with the least amount of energy cost. If you’re looking to minimize your energy cost all-year around, this model is top.
Most Efficient 12000 BTU: Fujitsu 12LZBS1 (29.4 SEER)
- BTU: 12,000
- SEER: 29.4
- HSPF: 12.9
- Heating: Down to minus 5°F
- Coverage: 400-600 sqft
- Price Range: $2,200-$2,400 (no kit)
The Fujitsu AIRSTAGE 12LZBS1 is the most efficient 12000 BTU mini split. Its 29.4 SEER rating is higher than the last place (16 SEER) by over 80%. Its 12.9 HSPF rating is the highest in its class.
Energy Saving Features:
- Economy mode automatically changes thermostat setting to avoid unnecessary cooling and heating.
- Energy Saver mode keeps room cool enough for comfort, reducing power consumption.
- Energy Saving Program (ESP) reduces energy consumption in unoccupied zones.
In a 500-sqft living room, the Fujitsu AIRSTAGE 12LZBS1 provides unmatched comfort with the least amount of energy cost. If you’re looking to reduce energy cost, this model is ideal.
Most Efficient 15000 BTU: Fujitsu 15LZBS1 (25.3 SEER)
- BTU: 14,500
- SEER: 25.3
- HSPF: 12.8
- Heating: Down to minus 5°F
- Coverage: 500-750 sqft
- Price Range: $2,300-$2,500 (no kit)
The Fujitsu AIRSTAGE 15LZBS1 is the most efficient 15000 BTU mini split. Its 25.3 SEER rating beats the last place (19.5 SEER) by nearly 30%. But, its high 12.8 HSPF sets itself apart from the crowd.
Energy Saving Features:
- Economy mode automatically changes thermostat setting to avoid unnecessary cooling and heating.
- Energy Saver mode keeps room cool enough for comfort, reducing power consumption.
- Energy Saving Program (ESP) reduces energy consumption in unoccupied zones.
In a 600-sqft open space, the Fujitsu AIRSTAGE 15LZBS1 provides strong cooling and heating without skyrocketing your electricity bill. The energy saving features become significant in such a capacity class.
Most Efficient 18000 BTU: Cooper & Hunter Olivia 18K (24 SEER)
- BTU: 18,000
- SEER: 24
- HSPF: 10.5
- Heating: Down to minus 13°F
- Coverage: 600-900 sqft
The Cooper & Hunter Olivia 18K is the most efficient 18000 BTU mini split. Its 24 SEER rating is 1.5 times higher than the last place (16 SEER). Its 10.5 HSPF is on the high side, consider its BTU.
Energy Saving Features:
- ECO mode for more energy savings.
- Built-in WiFi enables app remote control and scheduling to control usage.
- Follow Me remote controller function optimises operation based on your location.
In a 800-sqft garage converted living space, the Cooper & Hunter Olivia 18K runs optimally with its inverter technology and quiet operation, great for DIY enthusiasts and energy savers.
Most Efficient 24000 BTU: LG ArtCool Premier 24K (23 SEER)
- BTU: 24,000
- SEER: 23
- HSPF: 10
- Heating: Down to minus 13°F
- Coverage: 800-1,200 sqft
- Price Range: $2,800-$3,000 (no kit)
The LG ArtCool Premier 24K is the most efficient 24000 BTU mini split. Its 23 SEER rating is 44% higher than the last place (16 SEER). Its has a respectable 10 HSPF given its size.
Energy Saving Features:
- Active Energy Control (AEC) adjusts energy use based on usage patterns to save energy.
- kW Manager via LG ThinQ app to automatically adjust power consumption and track energy use.
- Low Refrigerant Detection prevents the system from running inefficiently.
In a 1000-sqft room, the LG ArtCool Premier 24K keeps the space comfortable while constantly adjusting its energy use to save you as much electricity as possible, a great model for large spaces.
Most Efficient 30000 BTU: Cooper & Hunter Olivia 30K (21 SEER)
- BTU: 30,000
- SEER: 21
- HSPF: 8.2
- Heating: Down to 5°F
- Coverage: 1,000-1,500 sqft
The Cooper & Hunter Olivia 30K is the most efficient 30000 BTU mini split. Its 21 SEER rating is 20% higher than the last place (17.5 SEER). Its 8.2 HSPF scores second place in the class.
Energy Saving Features:
- ECO mode for more energy savings.
- Built-in WiFi enables app remote control and scheduling to control usage.
- Follow Me remote controller function optimises operation based on your location.
In a 1200-sqft space, the Cooper & Hunter Olivia 30K saves energy. However, its heating performance is limited, better suited for those who primarily need large cooling.
Most Efficient 36000 BTU: Della Versa 36K (19 SEER)
- BTU: 36,000
- SEER: 19
- HSPF: 8.5
- Heating: Down to minus 4°F
- Coverage: 1,200-1,800 sqft
The Della Versa 36K is the most efficient 36000 BTU mini split. Its 19 SEER rating is nearly 20% higher than the last place (15.9 SEER). Its 8.5 HSPF is also among the top in the class.
Energy Saving Features:
- ECO mode for more energy savings.
- Built-in WiFi enables app remote control and scheduling to control usage.
- Smart Geo Location provides automated on/off control, saving energy.
In a 1500-sqft house, the Della Versa 36K keeps your electricity cost at minimum. Its built-in features optimize performance, ensuring every bit of energy counts.
How to Choose an Efficient Mini Split
Choosing an efficient mini split requires data-driven decisions.
- Size It Right: Match BTU to space: 20–30 BTU/sqft (e.g., 1,000 sqft = 20,000-30,000 BTU).
- Focus on SEER & HSPF: Aim for SEER 20+ if you prioritize cooling and HSPF 10+ for heating focused.
- Heating performance: Heating below minus 5°F fits cold climates.
- DIY or Pro Install: DIY saves labor cost; pros cost more but offer longer warranty.
- Set a Realistic Budget: High efficiency models are much more expensive.
Prioritize specs for your needs. For all-season uses, choose one with high SEER and HSPF.
FAQ
Answers to efficiency questions:
What’s the highest SEER mini split?
The Fujitsu 09LZBS1 hits 33.1 SEER2, leading the market.
Which mini split is most efficient for heating?
The Fujitsu LZBS1 series has the highest overall heating efficiency (HSPF) across all BTUs.
How much can high SEER save?
The difference of savings between 20 SEER2 and 15 SEER2 is up to 33%, as per Carrier.
Is HSPF critical?
Yes, HSPF measures the heating efficiency, critical for those who prioritize heating.
What is inverter technology?
Inverter technology enables the compressor to change its speed, achieving greater comfort at lower power consumption.
Which is the most efficient DIY mini split?
The Cooper & Hunter Olivia series is the most efficient mini split that comes with the installation kit. In terms of DIY-friendly, the MrCool DIY 4th Gen has respectably high SEER ratings.
See my full mini split guides to learn more.
Conclusion
These eight mini splits showcase 2026’s top efficiency in its class, ultra-high SEER, top HSPF and plenty of energy saving features to maximize your savings. Fujitsu, Mitsubishi, LG, Cooper & Hunter and Della offer standout energy-saving perks. Explore the table and reviews to find your match.
If highest efficiency isn’t a priority, you might want to explore the best mini-split air conditioners for different needs.
What do you think about this post? Leave a comment down below!
Well my Gree sapphire 9k is seer 38 and cost $1200.
Your research is lacking.
Hi Eben, yes based on the SEER standard, Gree Sapphire was the most efficient unit. However, as the standard moves to SEER2, the Sapphire series is now up to 27 SEER2 which is still among the highest. Thank you.
Gree Sapphire is 38 seer.
Your list is incorrect, if your research would be done without bias,it would be obvious.
Ps my sapphire cos $1200, retail
So why is your post not updated?
It is the most efficient available as of now.
What is your point in this posting infactual information to the public .
I assume monetary gain.
As I have replied earlier, please refer to SEER2 as the latest energy efficiency standard. Also, verify using AHRI directory to ensure the certified and tested model tallies with the marketing material. As of writing, Gree Sapphire is 27 SEER2. Thank you.