BOSTON AC vs Coast Air heat pumps

Measured against models of the same size and duct type, BOSTON AC scores higher on 5 of the 6 ratings. BOSTON AC has 6 outdoor models, Coast Air has 6 outdoor models. BOSTON AC and Coast Air have no QMID on file and are not ranked.

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CompareData as of Oct 11, 2026updated Oct 11, 2026 · 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.

BOSTON AC and Coast Air 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, BOSTON AC scores higher on 5 of the 6 ratings.

BOSTON AC
Coast Air
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	BOSTON AC	Coast Air
Efficiency index	56% (higher)median —	50% (higher)median —
COP at 5°F	55% (higher)median 1.99	52% (higher)median 1.95
Capacity retention at 5°F	52% (higher)median 73%	16% (higher)median 63%
HSPF2	45%median 9.0	46%median 9.1
SEER2	65% (higher)median 22.0	54% (higher)median 21.5
EER2	59% (higher)median 12.5	48% (higher)median 12.5
Heating capacity at 5°F	43% (higher)median 9,070 Btu/h	26% (higher)median 11,700 Btu/h
Outdoor models	6	6
AHRI certifications	6	6

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	BOSTON AC	Coast Air
CEE 2025 Tier 1 (Split ASHP)	100%6 models	66.7%4 models
CEE 2026 Tier 1 (Split ASHP)	100%6 models	66.7%4 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	83.3%5 models	0%0 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	0%0 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 · 2 groups where both have models

BOSTON AC
Coast Air
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	BOSTON AC	Coast Air
Non-ducted, up to 1.5 tons	5 · index 58%	3 · index 60%
Non-ducted, 2 tons	1 · index 47%	1 · index 51%
Non-ducted, 2.5–3 tons	None	2 · index 21%

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	BOSTON ACCold-climate score, best model	Coast AirCold-climate score, best model
Non-ducted, up to 1.5 tons	68.8(50 is the typical model of its size class)BA12HCT23X2Owith ductless indoor unit BA12HCT23X2I5 of 5 models qualify · AHRI 214720280	None on this board (0 of 3 models qualify)
Non-ducted, 2 tons	None on this board (0 of 1 models qualify)	None on this board (0 of 1 models qualify)
Non-ducted, 2.5–3 tons	No models in this size class	None on this board (0 of 2 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	BOSTON ACAll-around score, best model	Coast AirAll-around score, best model
Non-ducted, up to 1.5 tons	70.8(50 is the typical model of its size class)BA12HCT23X2Owith ductless indoor unit BA12HCT23X2I5 of 5 models have all five ratings · AHRI 214720280	72.3(50 is the typical model of its size class) (higher)A-CAD09-0Awith ductless indoor unit B-CAD09-0A3 of 3 models have all five ratings · AHRI 214312526
Non-ducted, 2 tons	46.5(50 is the typical model of its size class)BA24HCT20X2Owith ductless indoor unit BA24HCT20X2I1 of 1 models have all five ratings · AHRI 214796637	51.4(50 is the typical model of its size class) (higher)A-CAD24-1Awith ductless indoor unit B-CAD24-1A1 of 1 models have all five ratings · AHRI 211126489
Non-ducted, 2.5–3 tons	No models in this size class	20.9(50 is the typical model of its size class)A-CAD36-1Awith ductless indoor unit B-CAD36-1A1 of 2 models have all five ratings · AHRI 211126488

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	BOSTON AC	Coast Air
COP at 5°F	beats 89% · 2.21BA18HCT22X2ONon-ducted, up to 1.5 tons	beats 70% · 2.05A-CAD18-1ANon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 61% · 76%BA12HCT23X2ONon-ducted, up to 1.5 tons	beats 23% · 63%A-CAD24-1ANon-ducted, 2 tons
HSPF2	beats 57% · 9.5BA12HCT23X2ONon-ducted, up to 1.5 tons	beats 85% · 10.8A-CAD09-0ANon-ducted, up to 1.5 tons
SEER2	beats 73% · 23.0BA12HCT23X2ONon-ducted, up to 1.5 tons	beats 87% · 25.0A-CAD09-0ANon-ducted, up to 1.5 tons
EER2	beats 68% · 13.0BA12HCT23X2ONon-ducted, up to 1.5 tons	beats 89% · 14.5A-CAD09-0ANon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 73% · 12,600 Btu/hBA18HCT22X2ONon-ducted, up to 1.5 tons	beats 63% · 11,700 Btu/hA-CAD18-1ANon-ducted, up to 1.5 tons

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