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ACC vs MAMMOTH: heat pump ratings compared

Against heat pumps of the same size and type, a typical ACC model beats 55% and a typical MAMMOTH model 39%. ACC rates higher overall.

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

ACC

55%

of similar heat pumps beaten by its typical model

About 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°FACC: Beats 67%MAMMOTH: Beats 15%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FACC: Beats 77%MAMMOTH: Beats 29%
  • Winter-long heating efficiencyHSPF2ACC: Beats 55%MAMMOTH: Beats 41%
  • Summer-long cooling efficiencySEER2ACC: Beats 32%MAMMOTH: Beats 55%
  • Hot-day cooling efficiencyEER2ACC: Beats 12%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

    ACC
    0%
    MAMMOTH
    50%

  • Xcel CC

    ACC
    0%
    MAMMOTH
    50%

  • CEE Advanced

    ACC
    0%
    MAMMOTH
    0%

  • ENERGY STAR CC

    ACC
    0%
    MAMMOTH
    50%

All-around best, ducted 2.5–3 tons

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

Showing Ducted, 2.5–3 tons (27,000–38,999 Btu/h cooling), the most-listed ducted size. Pick yours above. What size is my system?

ACC

None of ACC’s ducted, 2.5–3 tons models has all five ratings.

MAMMOTH

  1. 1V5BV-28WMAKMAMMOTH2.5 tons · 28,000 Btu/h · DuctedNot a cold-climate pick: keeps 43% of its heat at 5°FMeets none of the standards tracked here
    Heat kept at 5°F
    44% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    1.70 (COP at 5°F)
    Below the middle
    Winter efficiency
    7.5 (HSPF2)
    Below the middle
    Cooling efficiency
    16.5 (SEER2)
    Good
    Hot-day cooling
    10.0 (EER2)
    Below the middle
    29.0score / 100Heating 16 · Cooling 42

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