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Gridless vs SLIMAIR TECHNOLOGIES: heat pump ratings compared

Against heat pumps of the same size and type, a typical Gridless model beats 60% and a typical SLIMAIR TECHNOLOGIES model 47%. Gridless rates higher overall.

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

Gridless

60%

of similar heat pumps beaten by its typical model

Well above average

11 models listed

SLIMAIR TECHNOLOGIES

47%

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°FGridless: Beats 40%SLIMAIR TECHNOLOGIES: Beats 14%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FGridless: Beats 77%SLIMAIR TECHNOLOGIES: Beats 33%
  • Winter-long heating efficiencyHSPF2Gridless: Beats 60%SLIMAIR TECHNOLOGIES: Beats 32%
  • Summer-long cooling efficiencySEER2Gridless: Beats 68%SLIMAIR TECHNOLOGIES: Beats 32%
  • Hot-day cooling efficiencyEER2Gridless: Beats 56%SLIMAIR TECHNOLOGIES: Beats 38%

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%
    SLIMAIR TECHNOLOGIES
    18%

  • Xcel CC

    Gridless
    100%
    SLIMAIR TECHNOLOGIES
    9%

  • CEE Advanced

    Gridless
    0%
    SLIMAIR TECHNOLOGIES
    0%

  • ENERGY STAR CC

    Gridless
    91%
    SLIMAIR TECHNOLOGIES
    0%

Top cold-climate picks, ducted 2 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 tons (21,000–26,999 Btu/h cooling). What size is my system?

Gridless

  1. 1O-AYC24SD-1with ducted air handler I-AYC24VAH-1Gridless2 tons · 22,000 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
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    9.0 (HSPF2)
    Good
    57.5score / 100

SLIMAIR TECHNOLOGIES

No ducted, 2 tons model from SLIMAIR TECHNOLOGIES.

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.

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