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Gridless vs ISLANDAIRE: heat pump ratings compared

Against heat pumps of the same size and type, a typical Gridless model beats 70% and a typical ISLANDAIRE model 17%. Gridless rates higher overall.

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

Gridless

70%

of similar heat pumps beaten by its typical model

Well above average

15 models listed

ISLANDAIRE

17%

of similar heat pumps beaten by its typical model

Well below average

15 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°FGridless: Beats 64%ISLANDAIRE: Beats 22%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FGridless: Beats 73%ISLANDAIRE: Beats 17%
  • Winter-long heating efficiencyHSPF2Gridless: Beats 62%ISLANDAIRE: Beats 5%
  • Summer-long cooling efficiencySEER2Gridless: Beats 73%ISLANDAIRE: Beats 19%
  • Hot-day cooling efficiencyEER2Gridless: Beats 73%ISLANDAIRE: Beats 20%

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

    Gridless
    100%
    ISLANDAIRE
    0%

  • Xcel CC

    Gridless
    100%
    ISLANDAIRE
    0%

  • CEE Advanced

    Gridless
    13%
    ISLANDAIRE
    0%

  • ENERGY STAR CC

    Gridless
    100%
    ISLANDAIRE
    0%

Top cold-climate picks, ducted 3.5–4.5 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, 3.5–4.5 tons (39,000–56,999 Btu/h cooling). What size is my system?

Gridless

  1. 1GRID48OCwith ducted air handler GRID48VAHGridless4 tons · 48,000 Btu/h · DuctedKeeps 77% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    77% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.52 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    9.0 (HSPF2)
    Good
    77.3score / 100

ISLANDAIRE

No ducted, 3.5–4.5 tons model from ISLANDAIRE.

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