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 Proair 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
Proair
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 11, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Gridless	Proair
Efficiency index	70% (higher)median —	52% (higher)median —
COP at 5°F	64% (higher)median 2.09	49% (higher)median 1.99
Capacity retention at 5°F	73% (higher)median 88%	55% (higher)median 75%
HSPF2	62% (higher)median 9.5	59% (higher)median 9.2
SEER2	73% (higher)median 22.0	55% (higher)median 19.2
EER2	73% (higher)median 12.3	44% (higher)median 10.9
Heating capacity at 5°F	66% (higher)median 18,000 Btu/h	62% (higher)median 22,500 Btu/h
Outdoor models	15	30
AHRI certifications	28	70

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Gridless	Proair
CEE 2025 Tier 1 (Split ASHP)	100%15 models	70%21 models
CEE 2026 Tier 1 (Split ASHP)	100%15 models	70%21 models
CEE Advanced Tier (Split ASHP)	13.3%2 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	100%15 models	66.7%20 models
DOE Cold Climate Heat Pump Challenge	13.3%2 models	0%0 models
ENERGY STAR Cold Climate	100%15 models	0%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 · 8 groups where both have models

Gridless
Proair
All models of the group

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

Source: AHRI Directory · as of Oct 11, 2026

Models per peer group · efficiency index within the group
Size and duct type	Gridless	Proair
Ducted, 2 tons	1 · index 47%	3 · index 46%
Ducted, 2.5–3 tons	1 · index 65%	7 · index 58%
Ducted, 3.5–4.5 tons	1 · index 82%	7 · index 59%
Ducted, 5 tons and up	1 · index 81%	1 · index 63%
Ducted, up to 1.5 tons	None	4 · index 61%
Non-ducted, up to 1.5 tons	7 · index 77%	7 · index 44%
Non-ducted, 2 tons	1 · index 61%	2 · index 43%
Non-ducted, 2.5–3 tons	2 · index 63%	5 · index 47%
Non-ducted, 3.5–4.5 tons	1 · index 44%	3 · index 57%
Non-ducted, 5 tons and up	None	1 · index 27%

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 type	GridlessCold-climate score, best model	ProairCold-climate score, best model
Ducted, up to 1.5 tons	No models in this size class	72.8(50 is the typical model of its size class)P30-18CENHP-R454with ducted air handler PAC-24B18T-INT3 of 4 models qualify · AHRI 217500210
Ducted, 2 tons	82.1(50 is the typical model of its size class) (higher)GRID24OCwith ducted air handler GRID24VAH1 of 1 models qualify · AHRI 217115267	55.0(50 is the typical model of its size class)P30-24CENHP-R454with ducted air handler PAC-24B18T-INT3 of 3 models qualify · AHRI 217500211
Ducted, 2.5–3 tons	87.9(50 is the typical model of its size class) (higher)GRID36OCwith ducted air handler GRID36VAH1 of 1 models qualify · AHRI 217115268	82.5(50 is the typical model of its size class)PMUL-H5P-36HP-M6 of 7 models qualify · AHRI 217500248
Ducted, 3.5–4.5 tons	77.3(50 is the typical model of its size class)GRID48OCwith ducted air handler GRID48VAH1 of 1 models qualify · AHRI 217115269	82.7(50 is the typical model of its size class) (higher)PMUL-H6P-48HP-M7 of 7 models qualify · AHRI 217500251
Ducted, 5 tons and up	88.7(50 is the typical model of its size class)GRID60OCwith ducted air handler GRID60VAH1 of 1 models qualify · AHRI 217115270	None on this board (0 of 1 models qualify)
Non-ducted, up to 1.5 tons	89.7(50 is the typical model of its size class) (higher)GRID09OHHVwith ductless indoor unit GRID09WHHV7 of 7 models qualify · AHRI 217101973	67.2(50 is the typical model of its size class)PMUL-H3P-18HP-M4 of 7 models qualify · AHRI 217500241
Non-ducted, 2 tons	54.1(50 is the typical model of its size class) (higher)GRID24OHVwith ductless indoor unit GRID24WHV1 of 1 models qualify · AHRI 217101978	45.1(50 is the typical model of its size class)POX21-24HFN10-Mwith ductless indoor unit PSAG-24HWM-M2 of 2 models qualify · AHRI 217500223
Non-ducted, 2.5–3 tons	53.7(50 is the typical model of its size class)GRID36OM42 of 2 models qualify · AHRI 217123264	72.6(50 is the typical model of its size class) (higher)PMUL-H5P-36HP-M3 of 5 models qualify · AHRI 217500249
Non-ducted, 3.5–4.5 tons	16.4(50 is the typical model of its size class)GRID48OM51 of 1 models qualify · AHRI 217123265	69.9(50 is the typical model of its size class) (higher)PMUL-H6P-60HP-M3 of 3 models qualify · AHRI 217500255
Non-ducted, 5 tons and up	No models in this size class	None on this board (0 of 1 models qualify)

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 type	GridlessAll-around score, best model	ProairAll-around score, best model
Ducted, up to 1.5 tons	No models in this size class	77.4(50 is the typical model of its size class)PMUL-H3P-18HP-M4 of 4 models have all five ratings · AHRI 217500242
Ducted, 2 tons	79.5(50 is the typical model of its size class) (higher)GRID24OCwith ducted air handler GRID24VAH1 of 1 models have all five ratings · AHRI 217115267	64.5(50 is the typical model of its size class)PMUL-A4P-27HP-M3 of 3 models have all five ratings · AHRI 217500230
Ducted, 2.5–3 tons	82.3(50 is the typical model of its size class)GRID36OCwith ducted air handler GRID36VAH1 of 1 models have all five ratings · AHRI 217115268	83.6(50 is the typical model of its size class) (higher)PMUL-H5P-36HP-M7 of 7 models have all five ratings · AHRI 217500248
Ducted, 3.5–4.5 tons	82.3(50 is the typical model of its size class)GRID48OCwith ducted air handler GRID48VAH1 of 1 models have all five ratings · AHRI 217115269	85.1(50 is the typical model of its size class) (higher)PMUL-A6P-48HP-M7 of 7 models have all five ratings · AHRI 217500236
Ducted, 5 tons and up	81.1(50 is the typical model of its size class) (higher)GRID60OCwith ducted air handler GRID60VAH1 of 1 models have all five ratings · AHRI 217115270	62.5(50 is the typical model of its size class)PMUL-A3P-60HP-M1 of 1 models have all five ratings · AHRI 217500239
Non-ducted, up to 1.5 tons	94.5(50 is the typical model of its size class) (higher)GRID09OHHVwith ductless indoor unit GRID09WHHV7 of 7 models have all five ratings · AHRI 217101973	62.7(50 is the typical model of its size class)PMUL-H3P-18HP-M7 of 7 models have all five ratings · AHRI 217500241
Non-ducted, 2 tons	61.3(50 is the typical model of its size class) (higher)GRID24OHVwith ductless indoor unit GRID24WHV1 of 1 models have all five ratings · AHRI 217101978	56.7(50 is the typical model of its size class)PMUL-A4P-27HP-M2 of 2 models have all five ratings · AHRI 217500229
Non-ducted, 2.5–3 tons	64.2(50 is the typical model of its size class)GRID24OM32 of 2 models have all five ratings · AHRI 217123263	66.3(50 is the typical model of its size class) (higher)PMUL-H5P-36HP-M5 of 5 models have all five ratings · AHRI 217500247
Non-ducted, 3.5–4.5 tons	43.7(50 is the typical model of its size class)GRID48OM51 of 1 models have all five ratings · AHRI 217123265	62.6(50 is the typical model of its size class) (higher)PMUL-H6P-60HP-M3 of 3 models have all five ratings · AHRI 217500253
Non-ducted, 5 tons and up	No models in this size class	32.5(50 is the typical model of its size class)PMUL-A3P-60HP-M1 of 1 models have all five ratings · AHRI 217500238

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
Rating	Gridless	Proair
COP at 5°F	beats 98% · 2.42GRID60OCDucted, 5 tons and up	beats 89% · 2.25PMUL-A3P-18HP-MNon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 94% · 75%GRID60OCDucted, 5 tons and up	beats 97% · 107%P30-30CENHP-R454Ducted, 2.5–3 tons
HSPF2	beats 96% · 10.5GRID36OCDucted, 2.5–3 tons	beats 99% · 11.0PMUL-H6P-48HP-MDucted, 3.5–4.5 tons
SEER2	beats 99% · 32.0GRID09OHHVNon-ducted, up to 1.5 tons	beats 96% · 20.4PMUL-A6P-48HP-MDucted, 3.5–4.5 tons
EER2	beats 100% · 18.4GRID09OHHVNon-ducted, up to 1.5 tons	beats 85% · 13.0PMUL-H3P-18HP-MDucted, up to 1.5 tons
Heating capacity at 5°F	beats 93% · 18,000 Btu/hGRID18OHVNon-ducted, up to 1.5 tons	beats 94% · 37,400 Btu/hPMUL-H5P-36HP-MNon-ducted, 2.5–3 tons

More comparisons

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Gridless vs Proair heat pumps