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.

CanAir and Viessmann 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, CanAir scores higher on 4 of the 6 ratings.

CanAir
Viessmann
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	CanAir	Viessmann
Efficiency index	56% (higher)median —	53% (higher)median —
COP at 5°F	48%median 1.91	52%median 1.95
Capacity retention at 5°F	57% (higher)median 79%	50% (higher)median 67%
HSPF2	70% (higher)median 9.5	63% (higher)median 9.2
SEER2	57%median 19.0	58%median 18.7
EER2	47% (higher)median 11.2	46% (higher)median 10.7
Heating capacity at 5°F	60% (higher)median 20,000 Btu/h	50% (higher)median 18,000 Btu/h
Outdoor models	44	53
AHRI certifications	74	123

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	CanAir	Viessmann
CEE 2025 Tier 1 (Split ASHP)	63.6%28 models	64.2%34 models
CEE 2026 Tier 1 (Split ASHP)	61.4%27 models	60.4%32 models
CEE Advanced Tier (Split ASHP)	0%0 models	3.8%2 models
Xcel Energy Colorado cold-climate ASHP (2025)	56.8%25 models	43.4%23 models
DOE Cold Climate Heat Pump Challenge	0%0 models	3.8%2 models
ENERGY STAR Cold Climate	59.1%26 models	47.2%25 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 · 9 groups where both have models

CanAir
Viessmann
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	CanAir	Viessmann
Ducted, up to 1.5 tons	6 · index 50%	6 · index 61%
Ducted, 2 tons	3 · index 57%	4 · index 65%
Ducted, 2.5–3 tons	10 · index 52%	9 · index 55%
Ducted, 3.5–4.5 tons	6 · index 49%	6 · index 59%
Ducted, 5 tons and up	1 · index 42%	2 · index 49%
Non-ducted, up to 1.5 tons	14 · index 61%	20 · index 53%
Non-ducted, 2 tons	4 · index 59%	4 · index 47%
Non-ducted, 2.5–3 tons	6 · index 59%	11 · index 47%
Non-ducted, 3.5–4.5 tons	1 · index 78%	5 · index 46%

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	CanAirCold-climate score, best model	ViessmannCold-climate score, best model
Ducted, up to 1.5 tons	63.7(50 is the typical model of its size class)MOX430U-18HFN1-Mwith ducted air handler MAC-24HWDN1-MN0Also listed as CDH2018C214 of 5 models qualify · AHRI 209550333	81.3(50 is the typical model of its size class) (higher)DLCSRBH18AAKwith ducted air handler DLFSDAH18XHK5 of 6 models qualify · AHRI 215569862
Ducted, 2 tons	67.3(50 is the typical model of its size class)MOX430-24HFN1-MR0with ducted air handler MAC-24HWDN1-MN04 of 4 models qualify · AHRI 209550328	79.4(50 is the typical model of its size class) (higher)DLCSRBH24AAKwith ducted air handler DLFSDAH24XAK4 of 4 models qualify · AHRI 215569794
Ducted, 2.5–3 tons	78.6(50 is the typical model of its size class)MOE31U-36HFN1-Mwith ducted air handler MAC-36HWFN1-MAlso listed as CDH2036C217 of 10 models qualify · AHRI 209550336	78.6(50 is the typical model of its size class)DLCURAH36ABKwith ducted air handler DLFULAH36XCX + CI3 of 9 models qualify · AHRI 215569769
Ducted, 3.5–4.5 tons	74.9(50 is the typical model of its size class)C28MC548H214 of 6 models qualify · AHRI 207683272	74.9(50 is the typical model of its size class)DLCMHBH48EAK4 of 6 models qualify · AHRI 215569823
Ducted, 5 tons and up	None on this board (0 of 1 models qualify)	None on this board (0 of 2 models qualify)
Non-ducted, up to 1.5 tons	89.3(50 is the typical model of its size class)C28SCH06H21with ductless indoor unit C28SEH06H217 of 14 models qualify · AHRI 207683255	95.0(50 is the typical model of its size class) (higher)DLCPRBH18AAKwith ductless indoor unit DLFPHBH18XAK11 of 20 models qualify · AHRI 215569835
Non-ducted, 2 tons	84.5(50 is the typical model of its size class)C28SCH24H21with ductless indoor unit C28SEH24H213 of 4 models qualify · AHRI 207683259	86.1(50 is the typical model of its size class) (higher)DLCSRBH24AAKwith ductless indoor unit DLFSCBH24XAK2 of 4 models qualify · AHRI 215569833
Non-ducted, 2.5–3 tons	79.3(50 is the typical model of its size class) (higher)C28MC436H222 of 6 models qualify · AHRI 213479407	73.4(50 is the typical model of its size class)DLCMHBH36DAK2 of 11 models qualify · AHRI 215569824
Non-ducted, 3.5–4.5 tons	76.2(50 is the typical model of its size class)C28MC548H211 of 1 models qualify · AHRI 207683271	80.5(50 is the typical model of its size class) (higher)DLCMHBH48EAK3 of 5 models qualify · AHRI 215569822

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	CanAirAll-around score, best model	ViessmannAll-around score, best model
Ducted, up to 1.5 tons	63.4(50 is the typical model of its size class)CDH2018C21with ducted air handler CDH2018F215 of 5 models have all five ratings · AHRI 207706568	85.2(50 is the typical model of its size class) (higher)DLCSRBH09AAKwith ducted air handler DLFSDAH09XAK6 of 6 models have all five ratings · AHRI 215569786
Ducted, 2 tons	74.1(50 is the typical model of its size class)C28MC324H214 of 4 models have all five ratings · AHRI 207683266	80.1(50 is the typical model of its size class) (higher)DLCSRBH24AAKwith ducted air handler DLFSDAH24XAK4 of 4 models have all five ratings · AHRI 215569794
Ducted, 2.5–3 tons	74.6(50 is the typical model of its size class) (higher)C28MC328H2110 of 10 models have all five ratings · AHRI 213479405	72.0(50 is the typical model of its size class)DLCMHBH30DAK9 of 9 models have all five ratings · AHRI 215569818
Ducted, 3.5–4.5 tons	82.0(50 is the typical model of its size class)C28MC548H216 of 6 models have all five ratings · AHRI 207683272	82.0(50 is the typical model of its size class)DLCMHBH48EAK6 of 6 models have all five ratings · AHRI 215569823
Ducted, 5 tons and up	41.7(50 is the typical model of its size class)CDH2060C21with ducted air handler CDH2060F211 of 1 models have all five ratings · AHRI 208101228	57.1(50 is the typical model of its size class) (higher)DLCLRCH58AAKwith ducted air handler DLFLDAH58XAK2 of 2 models have all five ratings · AHRI 215569836
Non-ducted, up to 1.5 tons	92.0(50 is the typical model of its size class)C28SCH06H21with ductless indoor unit C28SEH06H2114 of 14 models have all five ratings · AHRI 207683255	93.6(50 is the typical model of its size class) (higher)DLCPRBH18AAKwith ductless indoor unit DLFPHBH18XAK20 of 20 models have all five ratings · AHRI 215569835
Non-ducted, 2 tons	84.3(50 is the typical model of its size class)C28SCH24H21with ductless indoor unit C28SEH24H214 of 4 models have all five ratings · AHRI 207683259	84.3(50 is the typical model of its size class)DLCSRBH24AAKwith ductless indoor unit DLFSHCH24XAK4 of 4 models have all five ratings · AHRI 215569840
Non-ducted, 2.5–3 tons	82.8(50 is the typical model of its size class) (higher)C28MC436H225 of 6 models have all five ratings · AHRI 213479407	70.8(50 is the typical model of its size class)DLCMHBH36DAK11 of 11 models have all five ratings · AHRI 215569824
Non-ducted, 3.5–4.5 tons	77.9(50 is the typical model of its size class) (higher)C28MC548H211 of 1 models have all five ratings · AHRI 207683271	73.8(50 is the typical model of its size class)DLCMHBH48EAK5 of 5 models have all five ratings · AHRI 215569822

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	CanAir	Viessmann
COP at 5°F	beats 97% · 2.39C25SCH12H21Non-ducted, up to 1.5 tons	beats 99% · 2.89DLCPRBH18AAKNon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 92% · 107%C28SCH06H21Non-ducted, up to 1.5 tons	beats 97% · 120%DLCPRBH18AAKNon-ducted, up to 1.5 tons
HSPF2	beats 98% · 13.6C28SCH06H21Non-ducted, up to 1.5 tons	beats 100% · 15.0DLCPRBH09AAKNon-ducted, up to 1.5 tons
SEER2	beats 99% · 24.6C28MC324H21Non-ducted, 2 tons	beats 99% · 20.9DLCMHBH48EAKDucted, 3.5–4.5 tons
EER2	beats 98% · 16.2C28SCH09H21Non-ducted, up to 1.5 tons	beats 98% · 16.2DLCSRBH09AAKNon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 96% · 20,000 Btu/hC28MC218H22Non-ducted, up to 1.5 tons	beats 100% · 24,000 Btu/hDLCPRBH18AAKNon-ducted, up to 1.5 tons

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CanAir vs Viessmann heat pumps