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AIR-CON vs ZERO: heat pump ratings compared

Against heat pumps of the same size and type, a typical AIR-CON model beats 55% and a typical ZERO model 49%. AIR-CON rates higher overall.

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

AIR-CON

55%

of similar heat pumps beaten by its typical model

About average

65 models listed

ZERO

49%

of similar heat pumps beaten by its typical model

About average

69 models listed

Rating by ratingEach bar is the share of same-size, same-type heat pumps that a typical model beats, so the two brands compare fairly even if they make different sizes.
  • Efficiency on a 5°F dayCOP at 5°FAIR-CON: Beats 47%ZERO: Beats 48%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FAIR-CON: Beats 52%ZERO: Beats 43%
  • Winter-long heating efficiencyHSPF2AIR-CON: Beats 46%ZERO: Beats 46%
  • Summer-long cooling efficiencySEER2AIR-CON: Beats 54%ZERO: Beats 53%
  • Hot-day cooling efficiencyEER2AIR-CON: Beats 50%ZERO: Beats 46%

Average (50%)Dashed outline: the other brand, for comparison

Want ranks, distributions per size class and cold-weather curves? Switch to Advanced

Rebate standards

Share of each brand’s models that meet the level. Programs can have other rules too.

  • CEE 2025

    AIR-CON
    55%
    ZERO
    59%

  • Xcel CC

    AIR-CON
    49%
    ZERO
    48%

  • CEE Advanced

    AIR-CON
    0%
    ZERO
    0%

  • ENERGY STAR CC

    AIR-CON
    39%
    ZERO
    25%

Top cold-climate picks, ductless up to 1.5 tons

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, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

AIR-CON

  1. 1ASLCI4H4S09with ductless indoor unit ASLEC4H4S09AIR-CON1 ton · 9,000 Btu/h · DuctlessKeeps 83% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    83% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.25 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    76.9score / 100
  2. 2ABZCI4H4S09with ductless indoor unit ABZEM4H4S09AIR-CON1 ton · 9,000 Btu/h · DuctlessKeeps 81% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    81% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.05 (COP at 5°F)
    Good
    Seasonal efficiency
    10.5 (HSPF2)
    Great
    73.2score / 100
  3. 3ABHCI4H4S09with ductless indoor unit ABHEM4H4S09AIR-CON1 ton · 9,000 Btu/h · DuctlessKeeps 86% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    86% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.94 (COP at 5°F)
    Good
    Seasonal efficiency
    10.5 (HSPF2)
    Great
    70.3score / 100

ZERO

  1. 1ZMSB-09HV-USHHwith ductless indoor unit ZMSB-09HV-USHHZERO1 ton · 9,000 Btu/h · DuctlessKeeps 86% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    86% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.22 (COP at 5°F)
    Great
    Seasonal efficiency
    11.6 (HSPF2)
    Top 10%
    86.0score / 100
  2. 2ZMSB-12HV-USHHwith ductless indoor unit ZMSB-12HV-USHHZERO1 ton · 12,000 Btu/h · DuctlessKeeps 74% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    74% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.25 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    10.8 (HSPF2)
    Great
    77.8score / 100
  3. 3ZMSB-18HV-USHHwith ductless indoor unit ZMSB-18HV-USHHZERO1.5 tons · 18,000 Btu/h · DuctlessKeeps 71% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    71% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.35 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    10.5 (HSPF2)
    Great
    75.3score / 100

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.

Open the advanced view