COOL PRO vs DiamondAir heat pumps

Measured against models of the same size and duct type, COOL PRO scores higher on 2 of the 6 ratings. COOL PRO has 7 outdoor models, DiamondAir has 7 outdoor models. COOL PRO and DiamondAir 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.

COOL PRO and DiamondAir 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, COOL PRO scores higher on 2 of the 6 ratings.

COOL PRO
DiamondAir
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	COOL PRO	DiamondAir
Efficiency index	—median —	—median —
COP at 5°F	—median —	—median —
Capacity retention at 5°F	—median —	—median —
HSPF2	26%median 7.5	26%median 7.5
SEER2	23% (higher)median 14.3	21% (higher)median 14.3
EER2	61% (higher)median 11.7	60% (higher)median 11.7
Heating capacity at 5°F	—median —	—median —
Outdoor models	7	7
AHRI certifications	7	7

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	COOL PRO	DiamondAir
CEE 2025 Tier 1 (Split ASHP)	0%0 models	0%0 models
CEE 2026 Tier 1 (Split ASHP)	0%0 models	0%0 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	0%0 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 · 4 groups where both have models

COOL PRO
DiamondAir
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	COOL PRO	DiamondAir
Ducted, up to 1.5 tons	1 · index —	1 · index —
Ducted, 2 tons	1 · index —	1 · index —
Ducted, 2.5–3 tons	2 · index —	3 · index —
Ducted, 3.5–4.5 tons	3 · index —	2 · index —

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	COOL PROCold-climate score, best model	DiamondAirCold-climate score, best model
Ducted, up to 1.5 tons	None on this board (0 of 1 models qualify)	None on this board (0 of 1 models qualify)
Ducted, 2 tons	None on this board (0 of 1 models qualify)	None on this board (0 of 1 models qualify)
Ducted, 2.5–3 tons	None on this board (0 of 2 models qualify)	None on this board (0 of 3 models qualify)
Ducted, 3.5–4.5 tons	None on this board (0 of 3 models qualify)	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	COOL PROAll-around score, best model	DiamondAirAll-around score, best model
Ducted, up to 1.5 tons	None on this board (0 of 1 models have all five ratings)	None on this board (0 of 1 models have all five ratings)
Ducted, 2 tons	None on this board (0 of 1 models have all five ratings)	None on this board (0 of 1 models have all five ratings)
Ducted, 2.5–3 tons	None on this board (0 of 2 models have all five ratings)	None on this board (0 of 3 models have all five ratings)
Ducted, 3.5–4.5 tons	None on this board (0 of 3 models have all five ratings)	None on this board (0 of 2 models have all five ratings)

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	COOL PRO	DiamondAir
COP at 5°F	—	—
Capacity retention at 5°F	—	—
HSPF2	beats 27% · 7.5CP143S42HPCODucted, 3.5–4.5 tons	beats 27% · 7.5D1448HCL32ADucted, 3.5–4.5 tons
SEER2	beats 28% · 15.2CP143S30HPCODucted, 2.5–3 tons	beats 22% · 14.3D1448HCL32ADucted, 3.5–4.5 tons
EER2	beats 74% · 12.0CP143S30HPCODucted, 2.5–3 tons	beats 67% · 11.7D1448HCL32ADucted, 3.5–4.5 tons
Heating capacity at 5°F	—	—

More comparisons

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