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Gridless vs Hessaire heat pumps

Measured against models of the same size and duct type, Gridless scores higher on 6 of the 6 ratings. Gridless has 11 outdoor models, Hessaire has 11 outdoor models. Gridless and Hessaire have no QMID on file and are not ranked.

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CompareData as of updated · sources

Against comparable models

Each cell is the share of same-size, same-type models that the manufacturer’s typical model beats (50% is typical); the higher score is in bold. Raw medians are underneath for context: they depend on which sizes each one makes, so they are not compared.
Gridless and Hessaire on every ratingPeer scores, 0–100 · grey ticks: every ranked manufacturer · shaded: the middle half of each one’s modelsMeasured against models of the same size and duct type, Gridless scores higher on 6 of the 6 ratings.
  • Gridless
  • Hessaire
  • Other ranked manufacturers
GridlessHessaire

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingGridlessHessaire
Efficiency index60% (higher)median —50% (higher)median —
COP at 5°F40% (higher)median 1.8435% (higher)median 1.86
Capacity retention at 5°F77% (higher)median 86%50% (higher)median 70%
HSPF260% (higher)median 9.539% (higher)median 8.5
SEER268% (higher)median 21.046% (higher)median 17.5
EER256% (higher)median 12.531% (higher)median 10.2
Heating capacity at 5°F67% (higher)median 22,800 Btu/h52% (higher)median 18,000 Btu/h
Outdoor models1111
AHRI certifications1111

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardGridlessHessaire
CEE 2025 Tier 1 (Split ASHP)100%11 models54.5%6 models
CEE 2026 Tier 1 (Split ASHP)100%11 models54.5%6 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)100%11 models36.4%4 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate90.9%10 models36.4%4 models

Sizes and duct types offered

Models in each peer group, with the efficiency index of those models against the rest of the group.
Side by side, inside each size and duct typeShape: every model of the group · bars: each manufacturer’s middle half, median dot, 10th–90th line · 5 groups where both have models
  • Gridless
  • Hessaire
  • All models of the group
Ducted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsNon-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsNon-ducted, 3.5–4.5 tons1.97438 modelsmedian

Raw ratings are only placed side by side within one size and duct type, where they are comparable.

Source: AHRI Directory · as of

Models per peer group · efficiency index within the group
Size and duct typeGridlessHessaire
Ducted, 2 tons1 · index 46%1 · index 48%
Ducted, 2.5–3 tons1 · index 63%1 · index 63%
Ducted, 3.5–4.5 tons1 · index 57%2 · index 51%
Non-ducted, up to 1.5 tons4 · index 63%5 · index 46%
Non-ducted, 2 tons2 · index 64%2 · index 43%
Non-ducted, 2.5–3 tons1 · index 70%None
Non-ducted, 3.5–4.5 tons1 · index 45%None

Cold-climate and all-around picks, size class by size class

Each manufacturer’s best model on each board in every size and duct type, side by side; the higher score is in bold. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there), so the two compare fairly even when they make different sizes.

Cold-climate picks

Best cold-climate pick per size and duct type (keeps at least 70% of its heat at 5°F). Qualifies when its capacity retention at 5°F (capacity at 5°F as a share of capacity at 47°F) is at least 70% and Capacity retention at 5°F, COP at 5°F, HSPF2 are all rated. Score = the equal-weight mean of its peer percentiles on Capacity retention at 5°F, COP at 5°F, HSPF2 (share of the other models in its peer group it beats, 0–100), all from one certified pairing: in each duct type a model is sold in, its qualifying pairing of that type with the best score; equal scores (one decimal) go to the higher heating capacity at 5°F.
Size and duct typeGridlessCold-climate score, best modelHessaireCold-climate score, best model
Ducted, 2 tons57.5(50 is the typical model of its size class)O-AYC24SD-1with ducted air handler I-AYC24VAH-11 of 1 models qualify · AHRI 21324967361.7(50 is the typical model of its size class) (higher)HOC24with ducted air handler HAH241 of 1 models qualify · AHRI 212524529
Ducted, 2.5–3 tons75.1(50 is the typical model of its size class)O-AYC36SD-1with ducted air handler I-AYC36VAH-11 of 1 models qualify · AHRI 21324967475.1(50 is the typical model of its size class)HOC36with ducted air handler HAH361 of 1 models qualify · AHRI 212524530
Ducted, 3.5–4.5 tons56.6(50 is the typical model of its size class)O-AYC48SD-1with ducted air handler I-AYC48VAH-11 of 1 models qualify · AHRI 213249675None on this board (0 of 2 models qualify)
Non-ducted, up to 1.5 tons72.9(50 is the typical model of its size class) (higher)O-AYD09SD-1with ductless indoor unit I-AYD09W-14 of 4 models qualify · AHRI 21326555234.7(50 is the typical model of its size class)H12E1with ductless indoor unit H12E11 of 5 models qualify · AHRI 206913622
Non-ducted, 2 tons56.8(50 is the typical model of its size class) (higher)O-AYD24SD-32 of 2 models qualify · AHRI 21325558432.2(50 is the typical model of its size class)H24E2with ductless indoor unit H24E21 of 2 models qualify · AHRI 213286799
Non-ducted, 2.5–3 tons64.0(50 is the typical model of its size class)O-AYD36SD-41 of 1 models qualify · AHRI 213255585No models in this size class
Non-ducted, 3.5–4.5 tons41.8(50 is the typical model of its size class)O-AYD42SD-51 of 1 models qualify · AHRI 213255586No models in this size class

All-around best

Best all-around model per size and duct type. Score = 50% heating, the mean of its peer percentiles on COP at 5°F, Capacity retention at 5°F, HSPF2, plus 50% cooling, the mean of its peer percentiles on SEER2 and EER2 (share of the other models in its peer group it beats, 0–100). All five ratings are required; there is no minimum heat kept at 5°F. In each duct type a model is sold in, it is scored on its pairing of that type with the best score; equal scores (one decimal) go to the higher cold-climate score, then the higher heating capacity at 5°F.
Size and duct typeGridlessAll-around score, best modelHessaireAll-around score, best model
Ducted, 2 tons46.3(50 is the typical model of its size class)O-AYC24SD-1with ducted air handler I-AYC24VAH-11 of 1 models have all five ratings · AHRI 21324967348.4(50 is the typical model of its size class) (higher)HOC24with ducted air handler HAH241 of 1 models have all five ratings · AHRI 212524529
Ducted, 2.5–3 tons63.2(50 is the typical model of its size class)O-AYC36SD-1with ducted air handler I-AYC36VAH-11 of 1 models have all five ratings · AHRI 21324967463.2(50 is the typical model of its size class)HOC36with ducted air handler HAH361 of 1 models have all five ratings · AHRI 212524530
Ducted, 3.5–4.5 tons57.3(50 is the typical model of its size class) (higher)O-AYC48SD-1with ducted air handler I-AYC48VAH-11 of 1 models have all five ratings · AHRI 21324967557.1(50 is the typical model of its size class)HOC48with ducted air handler HAH482 of 2 models have all five ratings · AHRI 212524531
Non-ducted, up to 1.5 tons81.4(50 is the typical model of its size class) (higher)O-AYD09SD-1with ductless indoor unit I-AYD09W-14 of 4 models have all five ratings · AHRI 21326555246.8(50 is the typical model of its size class)H18E2with ductless indoor unit H18E22 of 5 models have all five ratings · AHRI 206913623
Non-ducted, 2 tons67.5(50 is the typical model of its size class) (higher)O-AYD24SD-32 of 2 models have all five ratings · AHRI 21325558442.6(50 is the typical model of its size class)H24E2with ductless indoor unit H24E21 of 2 models have all five ratings · AHRI 213286799
Non-ducted, 2.5–3 tons69.5(50 is the typical model of its size class)O-AYD36SD-41 of 1 models have all five ratings · AHRI 213255585No models in this size class
Non-ducted, 3.5–4.5 tons44.5(50 is the typical model of its size class)O-AYD42SD-51 of 1 models have all five ratings · AHRI 213255586No models in this size class

All-around board, every manufacturer

Standout model on each rating

Each manufacturer’s model that beats the largest share of comparable models on the rating; the higher share is in bold.
Top model per rating by peer percentile, with its AHRI-certified value and peer group
RatingGridlessHessaire
COP at 5°Fbeats 75% · 2.05O-AYC36SD-1Ducted, 2.5–3 tonsbeats 75% · 2.05HOC36Ducted, 2.5–3 tons
Capacity retention at 5°Fbeats 99% · 113%O-AYD36SD-4Non-ducted, 2.5–3 tonsbeats 63% · 76%HOC36Ducted, 2.5–3 tons
HSPF2beats 83% · 9.5O-AYC36SD-1Ducted, 2.5–3 tonsbeats 83% · 9.5HOC36Ducted, 2.5–3 tons
SEER2beats 89% · 25.5O-AYD09SD-1Non-ducted, up to 1.5 tonsbeats 82% · 17.5HOC48Ducted, 3.5–4.5 tons
EER2beats 89% · 14.5O-AYD09SD-1Non-ducted, up to 1.5 tonsbeats 68% · 13.0H18E2Non-ducted, up to 1.5 tons
Heating capacity at 5°Fbeats 92% · 18,000 Btu/hO-AYD18SD-2Non-ducted, up to 1.5 tonsbeats 66% · 11,900 Btu/hH18E2Non-ducted, up to 1.5 tons

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