ZERO heat pumps: how do their ratings compare?
A typical ZERO heat pump beats 53% of similar heat pumps (same size and type), which is about average. ZERO has 119 heat pump models in this list.
Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated
Overall score
53%
of similar heat pumps beaten by its typical model
About averageZERO has no QMID (the manufacturer ID the 25C tax credit needs) on file, so it is not ranked against other brands. Based on 130 models with every rating.
- Efficiency on a 5°F dayCOP at 5°FBeats 45%
- Heating power kept at 5°FCapacity at 5°F vs 47°FBeats 52%
- Winter-long heating efficiencyHSPF2Beats 57%
- Summer-long cooling efficiencySEER2Beats 58%
- Hot-day cooling efficiencyEER2Beats 48%
Average (50%)
Each bar: the share of similar heat pumps a typical model beats on that rating.
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Rebate standards
71%
meet CEE 2025 Tier 1, the level many utility rebates use.
84 models. All brands: 57%.
65%
meet Xcel Energy Colorado’s cold-climate rebate levels.
77 models. All brands: 53%.
0%
reach the cold-climate tier: full heating output and a COP of 2.1 or more at 5°F.
None of its models yet. All brands: 3%.
ZERO all-around best, by size
Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating against units their size.
Showing Ductless, 2 tons (21,000–26,999 Btu/h cooling). What size is my system?
9 of ZERO’s 9 models of this size and type have all five ratings.
- 1ZMSB-24HV-USHHR2-Owith ductless indoor unit ZMSB-24HV-USHHR2-IZERO2 tons · 24,000 Btu/h · DuctlessCold-climate pick, score 73.7Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 71% (Capacity at 5°F vs 47°F)
- Below the middle
- Efficiency at 5°F
- 2.15 (COP at 5°F)
- Great
- Winter efficiency
- 10.0 (HSPF2)
- Good
- Cooling efficiency
- 23.5 (SEER2)
- Top 10%
- Hot-day cooling
- 13.0 (EER2)
- Great
- 2ZMSB-24HV-USHHCR2-Owith ductless indoor unit ZMSB-24HV-USHHCR2-IZERO2 tons · 23,000 Btu/h · DuctlessCold-climate pick, score 77.2Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 92% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 13.3 (HSPF2)
- Top 10%
- Cooling efficiency
- 22.3 (SEER2)
- Good
- Hot-day cooling
- 12.5 (EER2)
- Good
- 3ZMSB-24HVT-USR1-S23-Owith ductless indoor unit ZMSB-24HVT-USR1-S23-IZERO2 tons · 23,000 Btu/h · DuctlessCold-climate pick, score 61.6Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 73% (Capacity at 5°F vs 47°F)
- Below the middle
- Efficiency at 5°F
- 2.10 (COP at 5°F)
- Good
- Winter efficiency
- 10.0 (HSPF2)
- Good
- Cooling efficiency
- 23.0 (SEER2)
- Great
- Hot-day cooling
- 12.0 (EER2)
- Good
- 4Z4SOV-27HDMB-USZERO2 tons · 26,000 Btu/h · DuctlessCold-climate pick, score 41.1Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 70% (Capacity at 5°F vs 47°F)
- Below the middle
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 9.5 (HSPF2)
- Below the middle
- Cooling efficiency
- 23.0 (SEER2)
- Great
- Hot-day cooling
- 12.2 (EER2)
- Good
- 5ZMSB-24HVT-USHHCR2with ductless indoor unit ZMSB-24HVT-USHHCR2ZERO2 tons · 24,000 Btu/h · DuctlessCold-climate pick, score 58.0Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 93% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 1.80 (COP at 5°F)
- Below the middle
- Winter efficiency
- 10.0 (HSPF2)
- Good
- Cooling efficiency
- 22.5 (SEER2)
- Good
- Hot-day cooling
- 11.7 (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.
What to do next
The advanced view has ZERO’s ranks on each rating, its models inside every size and type, cold-weather curves and its newest certifications.
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