DiamondAir vs NOVAIR heat pumps

Measured against models of the same size and duct type, NOVAIR scores higher on 3 of the 6 ratings. DiamondAir has 7 outdoor models, NOVAIR has 42 outdoor models. DiamondAir and NOVAIR 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.

DiamondAir and NOVAIR 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, NOVAIR scores higher on 3 of the 6 ratings.

DiamondAir
NOVAIR
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	DiamondAir	NOVAIR
Efficiency index	—median —	76%median —
COP at 5°F	—median —	59%median 2.00
Capacity retention at 5°F	—median —	75%median 96%
HSPF2	26%median 7.5	80%median 10.5
SEER2	21%median 14.3	83%median 24.0
EER2	60%median 11.7	81%median 13.0
Heating capacity at 5°F	—median —	71%median 20,200 Btu/h
Outdoor models	7	42
AHRI certifications	7	119

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	DiamondAir	NOVAIR
CEE 2025 Tier 1 (Split ASHP)	0%0 models	97.6%41 models
CEE 2026 Tier 1 (Split ASHP)	0%0 models	97.6%41 models
CEE Advanced Tier (Split ASHP)	0%0 models	4.8%2 models
Xcel Energy Colorado cold-climate ASHP (2025)	0%0 models	100%42 models
DOE Cold Climate Heat Pump Challenge	0%0 models	4.8%2 models
ENERGY STAR Cold Climate	0%0 models	100%42 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

DiamondAir
NOVAIR
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	DiamondAir	NOVAIR
Ducted, up to 1.5 tons	1 · index —	10 · index 77%
Ducted, 2 tons	1 · index —	2 · index 68%
Ducted, 2.5–3 tons	3 · index —	4 · index 75%
Ducted, 3.5–4.5 tons	2 · index —	4 · index 80%
Non-ducted, up to 1.5 tons	None	19 · index 78%
Non-ducted, 2 tons	None	3 · index 73%
Non-ducted, 2.5–3 tons	None	9 · index 78%
Non-ducted, 3.5–4.5 tons	None	5 · index 68%

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	DiamondAirCold-climate score, best model	NOVAIRCold-climate score, best model
Ducted, up to 1.5 tons	None on this board (0 of 1 models qualify)	93.5(50 is the typical model of its size class)LEA06SZ36-Owith ducted air handler LEA06DUCT-I10 of 10 models qualify · AHRI 217606302
Ducted, 2 tons	None on this board (0 of 1 models qualify)	75.8(50 is the typical model of its size class)LEA24CEN36-Owith ducted air handler LEA24HH-CEN-I2 of 2 models qualify · AHRI 218788024
Ducted, 2.5–3 tons	None on this board (0 of 3 models qualify)	82.5(50 is the typical model of its size class)LEA36MZ5P36-O4 of 4 models qualify · AHRI 217606266
Ducted, 3.5–4.5 tons	None on this board (0 of 2 models qualify)	82.7(50 is the typical model of its size class)LEA48MZ6P36-O4 of 4 models qualify · AHRI 217606269
Non-ducted, up to 1.5 tons	No models in this size class	96.7(50 is the typical model of its size class)LEA06SZ36-Owith ductless indoor unit 4LEA06USK-I18 of 19 models qualify · AHRI 217606280
Non-ducted, 2 tons	No models in this size class	89.4(50 is the typical model of its size class)LEA24SZ36-Owith ductless indoor unit LEA24CASS-I3 of 3 models qualify · AHRI 217606301
Non-ducted, 2.5–3 tons	No models in this size class	78.0(50 is the typical model of its size class)LEA36MZ5P36-O9 of 9 models qualify · AHRI 217606267
Non-ducted, 3.5–4.5 tons	No models in this size class	73.4(50 is the typical model of its size class)LEA48MZ6P36-O5 of 5 models qualify · AHRI 217606270

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	DiamondAirAll-around score, best model	NOVAIRAll-around score, best model
Ducted, up to 1.5 tons	None on this board (0 of 1 models have all five ratings)	95.0(50 is the typical model of its size class)LEA06SZ36-Owith ducted air handler LEA06DUCT-I10 of 10 models have all five ratings · AHRI 217606302
Ducted, 2 tons	None on this board (0 of 1 models have all five ratings)	71.7(50 is the typical model of its size class)LEA24CEN36-Owith ducted air handler LEA24HH-CEN-I2 of 2 models have all five ratings · AHRI 218788024
Ducted, 2.5–3 tons	None on this board (0 of 3 models have all five ratings)	83.6(50 is the typical model of its size class)LEA36MZ5P36-O4 of 4 models have all five ratings · AHRI 217606266
Ducted, 3.5–4.5 tons	None on this board (0 of 2 models have all five ratings)	83.9(50 is the typical model of its size class)LEA48MZ6P36-O4 of 4 models have all five ratings · AHRI 217606269
Non-ducted, up to 1.5 tons	No models in this size class	96.2(50 is the typical model of its size class)LEA06SZ36-Owith ductless indoor unit 4LEA06USK-I18 of 19 models have all five ratings · AHRI 217606280
Non-ducted, 2 tons	No models in this size class	86.8(50 is the typical model of its size class)LEA24SZ26-Owith ductless indoor unit 4LEA24USK-I3 of 3 models have all five ratings · AHRI 217606297
Non-ducted, 2.5–3 tons	No models in this size class	83.1(50 is the typical model of its size class)LEA28MZ-4P-454-O*Also listed as LEA27-MZ-LCT- 454-O9 of 9 models have all five ratings · AHRI 218372843
Non-ducted, 3.5–4.5 tons	No models in this size class	75.6(50 is the typical model of its size class)LEA48MZ6P36-O5 of 5 models have all five ratings · AHRI 217606268

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	DiamondAir	NOVAIR
COP at 5°F	—	beats 99% · 2.51LEA12SZ26-ONon-ducted, up to 1.5 tons
Capacity retention at 5°F	—	beats 100% · 150%LEA06HH-SK-ONon-ducted, up to 1.5 tons
HSPF2	beats 27% · 7.5D1448HCL32ADucted, 3.5–4.5 tons	beats 100% · 15.6LEA06HH-SK-ONon-ducted, up to 1.5 tons
SEER2	beats 22% · 14.3D1448HCL32ADucted, 3.5–4.5 tons	beats 100% · 35.0LEA06HH-SK-ONon-ducted, up to 1.5 tons
EER2	beats 67% · 11.7D1448HCL32ADucted, 3.5–4.5 tons	beats 99% · 18.0LEA06SZ36-ONon-ducted, up to 1.5 tons
Heating capacity at 5°F	—	beats 99% · 22,600 Btu/hLEA18HH-SK-ONon-ducted, up to 1.5 tons

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