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Gridless vs ISLANDAIRE heat pumps

Measured against models of the same size and duct type, Gridless scores higher on 6 of the 6 ratings. Gridless has 15 outdoor models, ISLANDAIRE has 15 outdoor models. Gridless and ISLANDAIRE 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 ISLANDAIRE 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
  • ISLANDAIRE
  • Other ranked manufacturers
GridlessISLANDAI…

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingGridlessISLANDAIRE
Efficiency index70% (higher)median —17% (higher)median —
COP at 5°F64% (higher)median 2.0922% (higher)median 1.67
Capacity retention at 5°F73% (higher)median 88%17% (higher)median 56%
HSPF262% (higher)median 9.55% (higher)median 6.6
SEER273% (higher)median 22.019% (higher)median 14.4
EER273% (higher)median 12.320% (higher)median 10.4
Heating capacity at 5°F66% (higher)median 18,000 Btu/h33% (higher)median 6,900 Btu/h
Outdoor models1515
AHRI certifications2815

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardGridlessISLANDAIRE
CEE 2025 Tier 1 (Split ASHP)100%15 models0%0 models
CEE 2026 Tier 1 (Split ASHP)100%15 models0%0 models
CEE Advanced Tier (Split ASHP)13.3%2 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)100%15 models0%0 models
DOE Cold Climate Heat Pump Challenge13.3%2 models0%0 models
ENERGY STAR Cold Climate100%15 models0%0 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 · 1 groups where both have models
  • Gridless
  • ISLANDAIRE
  • All models of the group
Ducted, up to 1.5 tons1.901,783 modelsDucted, 2 tons2.001,090 modelsDucted, 2.5–3 tons2.001,909 modelsDucted, 3.5–4.5 tons2.002,224 modelsDucted, 5 tons and up2.00321 modelsNon-ducted, up to 1.5 tons1.953,455 modelsNon-ducted, 2 tons2.00863 modelsNon-ducted, 2.5–3 tons2.001,106 modelsNon-ducted, 3.5–4.5 tons2.00564 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 typeGridlessISLANDAIRE
Ducted, 2 tons1 · index 47%1 · index 11%
Ducted, 2.5–3 tons1 · index 65%None
Ducted, 3.5–4.5 tons1 · index 82%None
Ducted, 5 tons and up1 · index 81%None
Ducted, up to 1.5 tonsNone14 · index 18%
Non-ducted, up to 1.5 tons7 · index 77%None
Non-ducted, 2 tons1 · index 61%None
Non-ducted, 2.5–3 tons2 · index 63%None
Non-ducted, 3.5–4.5 tons1 · index 44%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 modelISLANDAIRECold-climate score, best model
Ducted, up to 1.5 tonsNo models in this size class41.3(50 is the typical model of its size class)EZMB10L9A1S95AA3 of 14 models qualify · AHRI 218722968
Ducted, 2 tons82.1(50 is the typical model of its size class)GRID24OCwith ducted air handler GRID24VAH1 of 1 models qualify · AHRI 217115267None on this board (0 of 1 models qualify)
Ducted, 2.5–3 tons87.9(50 is the typical model of its size class)GRID36OCwith ducted air handler GRID36VAH1 of 1 models qualify · AHRI 217115268No models in this size class
Ducted, 3.5–4.5 tons77.3(50 is the typical model of its size class)GRID48OCwith ducted air handler GRID48VAH1 of 1 models qualify · AHRI 217115269No models in this size class
Ducted, 5 tons and up88.7(50 is the typical model of its size class)GRID60OCwith ducted air handler GRID60VAH1 of 1 models qualify · AHRI 217115270No models in this size class
Non-ducted, up to 1.5 tons89.7(50 is the typical model of its size class)GRID09OHHVwith ductless indoor unit GRID09WHHV7 of 7 models qualify · AHRI 217101973No models in this size class
Non-ducted, 2 tons54.1(50 is the typical model of its size class)GRID24OHVwith ductless indoor unit GRID24WHV1 of 1 models qualify · AHRI 217101978No models in this size class
Non-ducted, 2.5–3 tons53.7(50 is the typical model of its size class)GRID36OM42 of 2 models qualify · AHRI 217123264No models in this size class
Non-ducted, 3.5–4.5 tons16.4(50 is the typical model of its size class)GRID48OM51 of 1 models qualify · AHRI 217123265No 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 modelISLANDAIREAll-around score, best model
Ducted, up to 1.5 tonsNo models in this size class36.3(50 is the typical model of its size class)EZMB10L9A1S95AA14 of 14 models have all five ratings · AHRI 218722968
Ducted, 2 tons79.5(50 is the typical model of its size class) (higher)GRID24OCwith ducted air handler GRID24VAH1 of 1 models have all five ratings · AHRI 21711526711.2(50 is the typical model of its size class)EZVV24L**1N*7A*1 of 1 models have all five ratings · AHRI 218807233
Ducted, 2.5–3 tons82.3(50 is the typical model of its size class)GRID36OCwith ducted air handler GRID36VAH1 of 1 models have all five ratings · AHRI 217115268No models in this size class
Ducted, 3.5–4.5 tons82.3(50 is the typical model of its size class)GRID48OCwith ducted air handler GRID48VAH1 of 1 models have all five ratings · AHRI 217115269No models in this size class
Ducted, 5 tons and up81.1(50 is the typical model of its size class)GRID60OCwith ducted air handler GRID60VAH1 of 1 models have all five ratings · AHRI 217115270No models in this size class
Non-ducted, up to 1.5 tons94.5(50 is the typical model of its size class)GRID09OHHVwith ductless indoor unit GRID09WHHV7 of 7 models have all five ratings · AHRI 217101973No models in this size class
Non-ducted, 2 tons61.3(50 is the typical model of its size class)GRID24OHVwith ductless indoor unit GRID24WHV1 of 1 models have all five ratings · AHRI 217101978No models in this size class
Non-ducted, 2.5–3 tons64.2(50 is the typical model of its size class)GRID24OM32 of 2 models have all five ratings · AHRI 217123263No models in this size class
Non-ducted, 3.5–4.5 tons43.7(50 is the typical model of its size class)GRID48OM51 of 1 models have all five ratings · AHRI 217123265No 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
RatingGridlessISLANDAIRE
COP at 5°Fbeats 98% · 2.42GRID60OCDucted, 5 tons and upbeats 89% · 2.32EZMB10L9A1S95AADucted, up to 1.5 tons
Capacity retention at 5°Fbeats 94% · 75%GRID60OCDucted, 5 tons and upbeats 41% · 72%EZMB10L5A1S95AADucted, up to 1.5 tons
HSPF2beats 96% · 10.5GRID36OCDucted, 2.5–3 tonsbeats 13% · 7.5EZMB10L5A1S95AADucted, up to 1.5 tons
SEER2beats 99% · 32.0GRID09OHHVNon-ducted, up to 1.5 tonsbeats 51% · 16.4EZMB10L9A1S95AADucted, up to 1.5 tons
EER2beats 100% · 18.4GRID09OHHVNon-ducted, up to 1.5 tonsbeats 31% · 11.1EZVV12L8*Also listed as EZVV09L2, EZVV09L8, EZVV15L2, EZVV15L8Ducted, up to 1.5 tons
Heating capacity at 5°Fbeats 93% · 18,000 Btu/hGRID18OHVNon-ducted, up to 1.5 tonsbeats 58% · 11,100 Btu/hEZVV18L8*Also listed as EZVV24L3, EZVV24L8Ducted, up to 1.5 tons

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