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ZERO heat pumps: how do their ratings compare?

A typical ZERO heat pump beats 49% of similar heat pumps (same size and type), which is about average. ZERO has 69 heat pump models in this list.

Covers older R-410A heat pumps, no longer installed new. See models sold today · Updated

Overall score

49%

of similar heat pumps beaten by its typical model

About average

ZERO has no QMID (the manufacturer ID the 25C tax credit needs) on file, so it is not ranked against other brands. Based on 62 models with every rating.

ZERO, rating by ratingStrongest on summer-long cooling efficiency (beats 53%), weakest on heating power kept at 5°f (beats 43%).
  • Efficiency on a 5°F dayCOP at 5°FBeats 48%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FBeats 43%
  • Winter-long heating efficiencyHSPF2Beats 46%
  • Summer-long cooling efficiencySEER2Beats 53%
  • Hot-day cooling efficiencyEER2Beats 46%

Average (50%)

Each bar: the share of similar heat pumps a typical model beats on that rating.

Want ZERO’s ranks and its models inside every size class? Switch to Advanced

Rebate standards

Share of this brand’s models that meet the efficiency levels rebate programs use. Programs can have other rules too.

  • 59%

    meet CEE 2025 Tier 1, the level many utility rebates use.

    41 models. All brands: 48%.

    See them

  • 48%

    meet Xcel Energy Colorado’s cold-climate rebate levels.

    33 models. All brands: 38%.

    See them

  • 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: 1%.

Top ZERO cold-climate picks, by size

Only units that keep at least 70% of their heat at 5°F, ranked on heat kept, efficiency at 5°F and seasonal efficiency (HSPF2), against units their size.

Showing Ductless, 2 tons (21,000–26,999 Btu/h cooling). What size is my system?

4 of ZERO’s 9 models of this size and type qualify.

  1. 1ZSOV-24HDM-USwith ductless indoor unit ZEV-24HDM-USZERO2 tons · 24,000 Btu/h · DuctlessKeeps 76% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    76% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.20 (COP at 5°F)
    Great
    Seasonal efficiency
    10.3 (HSPF2)
    Great
    74.2score / 100
  2. 2ZMSB-24HV-USHHCwith ductless indoor unit ZMSB-24HV-USHHCZEROAlso listed as ZMSB-24HV-USHHC-O2 tons · 23,000 Btu/h · DuctlessKeeps 88% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    88% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.3 (HSPF2)
    Great
    61.1score / 100
  3. 3ZMSB-24HV-USHHwith ductless indoor unit ZMSB-24HV-USHHZERO2 tons · 24,000 Btu/h · DuctlessKeeps 75% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    75% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.22 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    8.5 (HSPF2)
    Below the middle
    55.7score / 100

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.

Open the advanced view