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ACC vs ULTRA MAXI AIR: heat pump ratings compared

Against heat pumps of the same size and type, a typical ACC model beats 55% and a typical ULTRA MAXI AIR model 31%. 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

ULTRA MAXI AIR

31%

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%ULTRA MAXI AIR: Beats 35%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FACC: Beats 77%ULTRA MAXI AIR: Beats 7%
  • Winter-long heating efficiencyHSPF2ACC: Beats 55%ULTRA MAXI AIR: Beats 38%
  • Summer-long cooling efficiencySEER2ACC: Beats 32%ULTRA MAXI AIR: Beats 42%
  • Hot-day cooling efficiencyEER2ACC: Beats 12%ULTRA MAXI AIR: Beats 26%

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%
    ULTRA MAXI AIR
    25%

  • Xcel CC

    ACC
    0%
    ULTRA MAXI AIR
    0%

  • CEE Advanced

    ACC
    0%
    ULTRA MAXI AIR
    0%

  • ENERGY STAR CC

    ACC
    0%
    ULTRA MAXI AIR
    0%

Top cold-climate picks, ducted 2.5–3 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, 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 qualifies.

ULTRA MAXI AIR

No ducted, 2.5–3 tons model from ULTRA MAXI AIR.

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