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COMFORMATIC vs YISO: heat pump ratings compared

Against heat pumps of the same size and type, a typical COMFORMATIC model beats 41% and a typical YISO model 66%. YISO rates higher overall.

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

COMFORMATIC

41%

of similar heat pumps beaten by its typical model

Below average

6 models listed

YISO

66%

of similar heat pumps beaten by its typical model

Well above average

7 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°FCOMFORMATIC: Beats 35%YISO: Beats 50%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FCOMFORMATIC: Beats 39%YISO: Beats 52%
  • Winter-long heating efficiencyHSPF2COMFORMATIC: Beats 21%YISO: Beats 75%
  • Summer-long cooling efficiencySEER2COMFORMATIC: Beats 55%YISO: Beats 80%
  • Hot-day cooling efficiencyEER2COMFORMATIC: Beats 44%YISO: Beats 64%

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

    COMFORMATIC
    100%
    YISO
    100%

  • Xcel CC

    COMFORMATIC
    83%
    YISO
    100%

  • CEE Advanced

    COMFORMATIC
    0%
    YISO
    0%

  • ENERGY STAR CC

    COMFORMATIC
    0%
    YISO
    100%

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?

COMFORMATIC

No ductless, 5 tons and up model from COMFORMATIC.

YISO

No ductless, 5 tons and up model from YISO.

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