Skip to content
Rebate.Blue

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

AIR-CON

  1. 1ASLCI4H4S24with ductless indoor unit ASLEC4H4S24AIR-CON2 tons · 24,000 Btu/h · DuctlessKeeps 73% of its heat at 5°FMeets 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
    2.20 (COP at 5°F)
    Great
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    68.3score / 100
  2. 2AMSCI4H4S24AIR-CON2 tons · 24,000 Btu/h · DuctlessKeeps 100% of its heat at 5°FMeets 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
    1.84 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.1 (HSPF2)
    Good
    64.4score / 100
  3. 3ABXCI4H4S24with ductless indoor unit ABXEM4H4S24AIR-CON2 tons · 23,000 Btu/h · DuctlessKeeps 89% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    89% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.13 (COP at 5°F)
    Great
    Seasonal efficiency
    8.6 (HSPF2)
    Below the middle
    64.0score / 100

ZERO

  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.

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