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DIYCOOL vs ZERO: heat pump ratings compared

Against heat pumps of the same size and type, a typical DIYCOOL model beats 54% and a typical ZERO model 53%. DIYCOOL rates slightly higher overall.

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

DIYCOOL

54%

of similar heat pumps beaten by its typical model

About average

24 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°FDIYCOOL: Beats 53%ZERO: Beats 45%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FDIYCOOL: Beats 51%ZERO: Beats 52%
  • Winter-long heating efficiencyHSPF2DIYCOOL: Beats 63%ZERO: Beats 57%
  • Summer-long cooling efficiencySEER2DIYCOOL: Beats 60%ZERO: Beats 58%
  • Hot-day cooling efficiencyEER2DIYCOOL: Beats 47%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

    DIYCOOL
    79%
    ZERO
    71%

  • Xcel CC

    DIYCOOL
    71%
    ZERO
    65%

  • CEE Advanced

    DIYCOOL
    4%
    ZERO
    0%

  • ENERGY STAR CC

    DIYCOOL
    75%
    ZERO
    53%

All-around best, ductless 5 tons and up

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

Showing Ductless, 5 tons and up (57,000 Btu/h and up cooling). What size is my system?

DIYCOOL

No ductless, 5 tons and up model from DIYCOOL.

ZERO

  1. 1Z4SOV-60HDMB-USZEROAlso listed as Z6SOV-60HDMB-US5 tons · 60,000 Btu/h · DuctlessNot a cold-climate pick: keeps 63% of its heat at 5°FMeets CEE 2025
    Heat kept at 5°F
    60% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Below the middle
    Winter efficiency
    9.6 (HSPF2)
    Good
    Cooling efficiency
    19.2 (SEER2)
    Below the middle
    Hot-day cooling
    10.0 (EER2)
    Below the middle
    32.5score / 100Heating 28 · Cooling 37

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