AIR C vs OLMO: heat pump ratings compared
Against heat pumps of the same size and type, a typical AIR C model beats 78% and a typical OLMO model 43%. AIR C rates higher overall.
Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated
AIR C
78%
of similar heat pumps beaten by its typical model
Well above average11 models listed
OLMO
43%
of similar heat pumps beaten by its typical model
Below average11 models listed
- Efficiency on a 5°F dayCOP at 5°FAIR C: Beats 60%OLMO: Beats 45%
- Heating power kept at 5°FCapacity at 5°F vs 47°FAIR C: Beats 85%OLMO: Beats 40%
- Winter-long heating efficiencyHSPF2AIR C: Beats 88%OLMO: Beats 33%
- Summer-long cooling efficiencySEER2AIR C: Beats 81%OLMO: Beats 45%
- Hot-day cooling efficiencyEER2AIR C: Beats 79%OLMO: Beats 50%
Average (50%)Dashed outline: the other brand, for comparison
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Rebate standards
CEE 2025
- AIR C
- 91%
- OLMO
- 91%
Xcel CC
- AIR C
- 100%
- OLMO
- 55%
CEE Advanced
- AIR C
- 0%
- OLMO
- 0%
ENERGY STAR CC
- AIR C
- 0%
- OLMO
- 36%
All-around best, ductless up to 1.5 tons
Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating against units their size.
Showing Ductless, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?
AIR C
- 1UE-SH09S1Pwith ductless indoor unit UI-SH09MS1PAIR C1 ton · 9,000 Btu/h · DuctlessCold-climate pick, score 85.9Meets CEE 2025, CEE 2026, Xcel CC
- Heat kept at 5°F
- 113% (Capacity at 5°F vs 47°F)
- Top 10%
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 14.6 (HSPF2)
- Top 10%
- Cooling efficiency
- 33.3 (SEER2)
- Top 10%
- Hot-day cooling
- 17.0 (EER2)
- Top 10%
- 2UE-SH12S1Pwith ductless indoor unit UI-SH12MS1PAIR C1 ton · 12,000 Btu/h · DuctlessCold-climate pick, score 85.4Meets CEE 2025, CEE 2026, Xcel CC
- Heat kept at 5°F
- 113% (Capacity at 5°F vs 47°F)
- Top 10%
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 12.7 (HSPF2)
- Top 10%
- Cooling efficiency
- 29.4 (SEER2)
- Top 10%
- Hot-day cooling
- 14.2 (EER2)
- Great
- 3UE-H18M1PAIR C1.5 tons · 19,000 Btu/h · DuctlessCold-climate pick, score 73.1Meets CEE 2025, CEE 2026, Xcel CC
- Heat kept at 5°F
- 95% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 10.4 (HSPF2)
- Great
- Cooling efficiency
- 25.0 (SEER2)
- Great
- Hot-day cooling
- 15.0 (EER2)
- Top 10%
OLMO
- 1OS-RMS18-230VOOLMO1.5 tons · 18,000 Btu/h · DuctlessCold-climate pick, score 69.5Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 100% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 1.99 (COP at 5°F)
- Good
- Winter efficiency
- 10.0 (HSPF2)
- Good
- Cooling efficiency
- 22.0 (SEER2)
- Good
- Hot-day cooling
- 13.3 (EER2)
- Great
- 2OS-SR09-230VOwith ductless indoor unit OS-09SRW-230VIOLMO1 ton · 9,000 Btu/h · DuctlessNot a cold-climate pick: keeps 60% of its heat at 5°FMeets CEE 2025, CEE 2026
- Heat kept at 5°F
- 63% (Capacity at 5°F vs 47°F)
- Below the middle
- Efficiency at 5°F
- 2.10 (COP at 5°F)
- Great
- Winter efficiency
- 9.5 (HSPF2)
- Below the middle
- Cooling efficiency
- 23.0 (SEER2)
- Good
- Hot-day cooling
- 13.0 (EER2)
- Good
- 3OS-SR18-230VOwith ductless indoor unit OS-18SRW-230VIOLMO1.5 tons · 18,000 Btu/h · DuctlessCold-climate pick, score 69.0Meets CEE 2025, CEE 2026, Xcel CC
- Heat kept at 5°F
- 76% (Capacity at 5°F vs 47°F)
- Good
- Efficiency at 5°F
- 2.49 (COP at 5°F)
- Top 10%
- Winter efficiency
- 9.8 (HSPF2)
- Good
- Cooling efficiency
- 21.0 (SEER2)
- Below the middle
- Hot-day cooling
- 12.0 (EER2)
- Below the middle
These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.
Next steps
The advanced view adds ranks, both brands’ models inside every size class, standout models per rating and cold-weather curves.
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