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airspool vs STEALTH: heat pump ratings compared

Against heat pumps of the same size and type, a typical airspool model beats 66% and a typical STEALTH model 54%. airspool rates higher overall.

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

airspool

66%

of similar heat pumps beaten by its typical model

Well above average

11 models listed

STEALTH

54%

of similar heat pumps beaten by its typical model

About average

11 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°Fairspool: Beats 76%STEALTH: Beats 53%
  • Heating power kept at 5°FCapacity at 5°F vs 47°Fairspool: Beats 75%STEALTH: Beats 59%
  • Winter-long heating efficiencyHSPF2airspool: Beats 72%STEALTH: Beats 59%
  • Summer-long cooling efficiencySEER2airspool: Beats 58%STEALTH: Beats 62%
  • Hot-day cooling efficiencyEER2airspool: Beats 65%STEALTH: Beats 39%

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

    airspool
    73%
    STEALTH
    73%

  • Xcel CC

    airspool
    73%
    STEALTH
    64%

  • CEE Advanced

    airspool
    0%
    STEALTH
    0%

  • ENERGY STAR CC

    airspool
    73%
    STEALTH
    0%

All-around best, ductless 3.5–4.5 tons

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

Showing Ductless, 3.5–4.5 tons (39,000–56,999 Btu/h cooling). What size is my system?

airspool

No ductless, 3.5–4.5 tons model from airspool.

STEALTH

No ductless, 3.5–4.5 tons model from STEALTH.

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