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COMFORMATIC vs MAMMOTH: heat pump ratings compared

Against heat pumps of the same size and type, a typical COMFORMATIC model beats 44% and a typical MAMMOTH model 39%. COMFORMATIC rates higher overall.

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

COMFORMATIC

44%

of similar heat pumps beaten by its typical model

Below average

4 models listed

MAMMOTH

39%

of similar heat pumps beaten by its typical model

Well below average

4 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 37%MAMMOTH: Beats 15%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FCOMFORMATIC: Beats 64%MAMMOTH: Beats 29%
  • Winter-long heating efficiencyHSPF2COMFORMATIC: Beats 42%MAMMOTH: Beats 41%
  • Summer-long cooling efficiencySEER2COMFORMATIC: Beats 44%MAMMOTH: Beats 55%
  • Hot-day cooling efficiencyEER2COMFORMATIC: Beats 39%MAMMOTH: Beats 43%

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
    50%
    MAMMOTH
    50%

  • Xcel CC

    COMFORMATIC
    50%
    MAMMOTH
    50%

  • CEE Advanced

    COMFORMATIC
    0%
    MAMMOTH
    0%

  • ENERGY STAR CC

    COMFORMATIC
    50%
    MAMMOTH
    50%

Top cold-climate picks, ducted 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 Ducted, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

COMFORMATIC

  1. 1GFMCX18-H2COMFORMATIC1.5 tons · 17,000 Btu/h · DuctedKeeps 78% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    78% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.88 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    8.1 (HSPF2)
    Below the middle
    36.0score / 100

MAMMOTH

No ducted, up to 1.5 tons model from MAMMOTH.

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