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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 up to 1.5 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, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

Gridless

No ducted, up to 1.5 tons model from Gridless.

SLIMAIR TECHNOLOGIES

No ducted, up to 1.5 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.

Open the advanced view