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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 45% and a typical ZERO model 53%. ZERO rates higher overall.

Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated

AIR-CON

45%

of similar heat pumps beaten by its typical model

About average

41 models listed

ZERO

53%

of similar heat pumps beaten by its typical model

About average

119 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 57%ZERO: Beats 45%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FAIR-CON: Beats 33%ZERO: Beats 52%
  • Winter-long heating efficiencyHSPF2AIR-CON: Beats 45%ZERO: Beats 57%
  • Summer-long cooling efficiencySEER2AIR-CON: Beats 43%ZERO: Beats 58%
  • Hot-day cooling efficiencyEER2AIR-CON: Beats 39%ZERO: Beats 48%

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
    44%
    ZERO
    71%

  • Xcel CC

    AIR-CON
    34%
    ZERO
    65%

  • CEE Advanced

    AIR-CON
    0%
    ZERO
    0%

  • ENERGY STAR CC

    AIR-CON
    0%
    ZERO
    53%

All-around best, ducted up to 1.5 tons

Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating against units their size.

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

AIR-CON

  1. 1ASGCI8H4M18with ducted air handler ASGEK8H4M18AIR-CON1.5 tons · 17,500 Btu/h · DuctedCold-climate pick, score 69.8Meets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    71% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.41 (COP at 5°F)
    Top 10%
    Winter efficiency
    11.3 (HSPF2)
    Top 10%
    Cooling efficiency
    20.0 (SEER2)
    Great
    Hot-day cooling
    13.3 (EER2)
    Top 10%
    78.4score / 100Heating 70 · Cooling 87

ZERO

  1. 1Z4SOV-18HDMB-USHHZERO1.5 tons · 19,000 Btu/h · DuctedCold-climate pick, score 70.8Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    90% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    10.0 (HSPF2)
    Great
    Cooling efficiency
    20.0 (SEER2)
    Great
    Hot-day cooling
    13.0 (EER2)
    Great
    77.4score / 100Heating 71 · Cooling 84
  2. 2Z4SOV-18HDMB-USZEROAlso listed as Z3SOV-18HDMB-US1.5 tons · 18,000 Btu/h · DuctedCold-climate pick, score 72.6Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    77% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.30 (COP at 5°F)
    Great
    Winter efficiency
    10.0 (HSPF2)
    Great
    Cooling efficiency
    20.0 (SEER2)
    Great
    Hot-day cooling
    12.0 (EER2)
    Good
    74.1score / 100Heating 73 · Cooling 76
  3. 3ZSOVA-18HDMB-USHHwith ducted air handler ZAVA-18HDMB-USZERO1.5 tons · 18,000 Btu/h · DuctedCold-climate pick, score 70.4Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR 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
    9.7 (HSPF2)
    Good
    Cooling efficiency
    19.0 (SEER2)
    Good
    Hot-day cooling
    12.5 (EER2)
    Great
    71.8score / 100Heating 70 · Cooling 73

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