Rankings
Most Efficient Mini Splits
Ranked by each unit's normalized efficiency score, which standardizes SEER2 and HSPF2 across sizes into one comparable number out of 10. The headline SEER2 is shown for context. See all rankings · the most-efficient guide.
- 01
Efficiency
10.0/10 - 02
Mitsubishi Electric · 12,000 BTU
Most Efficient Mitsubishi Mini Split? MSZ-FX12NLHZ Review (2026)
29.9 SEER2
Efficiency
10.0/10 - 03
Efficiency
10.0/10 - 04
Efficiency
10.0/10 - 05
Efficiency
8.0/10 - 06
Efficiency
8.0/10 - 07
Efficiency
6.0/10 - 08
Efficiency
6.0/10 - 09
Efficiency
6.0/10 - 10
Efficiency
6.0/10 - 11
Efficiency
6.0/10 - 12
Efficiency
6.0/10 - 13
Zone Air · 12,000 BTU
Zone Air DIY Series Review (2026): U.S.-Assembled Pre-Charged Mini Split
24 SEER2
Efficiency
6.0/10 - 14
Efficiency
6.0/10 - 15
MRCOOL · 12,000 BTU
MRCOOL DIY 5th Gen Review: Real-World Performance, Hyper Heat & DIY Installation
23.6 SEER2
Efficiency
6.0/10 - 16
MRCOOL · 12,000 BTU
MRCOOL DIY 4th Gen Review (2026): How It Stacks Up Against DIY Alternatives
23.5 SEER2
Efficiency
6.0/10 - 17
Efficiency
6.0/10 - 18
Efficiency
6.0/10 - 19
Efficiency
4.0/10 - 20
Efficiency
4.0/10