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.

Airdach and Della 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, Della scores higher on 4 of the 6 ratings.

Airdach
Della
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Airdach	Della
Efficiency index	40%median —	48%median — · 24th ranked
COP at 5°F	48% (higher)median 1.94	43% (higher)median 1.93 · 26th ranked
Capacity retention at 5°F	34%median 71%	44%median 73% · 21st ranked
HSPF2	28%median 7.5	50%median 9.5 · 16th ranked
SEER2	29%median 14.3	55%median 21.0 · 14th ranked
EER2	49% (higher)median 11.4	41% (higher)median 11.2 · 23rd ranked
Heating capacity at 5°F	31%median 15,700 Btu/h	46%median 12,250 Btu/h · 21st ranked
Outdoor models	29	94
AHRI certifications	45	133

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Airdach	Della
CEE 2025 Tier 1 (Split ASHP)	24.1%7 models	68.1%64 models
CEE 2026 Tier 1 (Split ASHP)	24.1%7 models	68.1%64 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	31%9 models	66%62 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	0%0 models	43.6%41 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 · 7 groups where both have models

Airdach
Della
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	Airdach	Della
Ducted, up to 1.5 tons	2 · index —	3 · index 67%
Ducted, 2 tons	3 · index 36%	2 · index 46%
Ducted, 2.5–3 tons	7 · index 48%	6 · index 65%
Ducted, 3.5–4.5 tons	10 · index 54%	6 · index 54%
Non-ducted, up to 1.5 tons	5 · index 30%	60 · index 46%
Non-ducted, 2 tons	1 · index 25%	13 · index 45%
Non-ducted, 2.5–3 tons	1 · index 30%	12 · index 42%
Non-ducted, 3.5–4.5 tons	None	5 · index 44%

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	AirdachCold-climate score, best model	DellaCold-climate score, best model
Ducted, up to 1.5 tons	None on this board (0 of 2 models qualify)	57.7(50 is the typical model of its size class)048-TLP-MODU-1D23 of 3 models qualify · AHRI 217568631
Ducted, 2 tons	None on this board (0 of 3 models qualify)	56.4(50 is the typical model of its size class)048-TCQ-MODU-1D32 of 2 models qualify · AHRI 218718736
Ducted, 2.5–3 tons	59.2(50 is the typical model of its size class)A3TH36180OV1DGwith ducted air handler A3DH36000OE1DT1 of 7 models qualify · AHRI 218797045	63.1(50 is the typical model of its size class) (higher)048-TPH-MODU-1D46 of 6 models qualify · AHRI 218718740
Ducted, 3.5–4.5 tons	69.8(50 is the typical model of its size class) (higher)A3TH60180OV1DGwith ducted air handler A3DH60000OE1DT1 of 10 models qualify · AHRI 218797046	63.6(50 is the typical model of its size class)048-TCQ-MODU-1D56 of 6 models qualify · AHRI 218718738
Non-ducted, up to 1.5 tons	41.6(50 is the typical model of its size class)ACSH0920VR1-D3with ductless indoor unit AIWH0900VR1-D35 of 5 models qualify · AHRI 217101992	70.9(50 is the typical model of its size class) (higher)048-TPH-MODU-1D342 of 60 models qualify · AHRI 218471007
Non-ducted, 2 tons	13.5(50 is the typical model of its size class)ACSH2419VR1-D3with ductless indoor unit AIWH2400VR1-D31 of 1 models qualify · AHRI 217101991	77.5(50 is the typical model of its size class) (higher)048-MS-24K2VR-22S-MX-OUTwith ductless indoor unit 048-MS-24K2VR-22S-MX-IN6 of 13 models qualify · AHRI 218043770
Non-ducted, 2.5–3 tons	22.3(50 is the typical model of its size class)ACSH3621VR1-D3with ductless indoor unit AIWH3600VR1-D31 of 1 models qualify · AHRI 217101990	68.0(50 is the typical model of its size class) (higher)048-TPH-MODU-1D48 of 12 models qualify · AHRI 218471008
Non-ducted, 3.5–4.5 tons	No models in this size class	48.1(50 is the typical model of its size class)048-TPH-MODU-1D64 of 5 models qualify · AHRI 218471010

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	AirdachAll-around score, best model	DellaAll-around score, best model
Ducted, up to 1.5 tons	None on this board (0 of 2 models have all five ratings)	72.9(50 is the typical model of its size class)048-TPH-MODU-1D33 of 3 models have all five ratings · AHRI 218718739
Ducted, 2 tons	35.7(50 is the typical model of its size class)A4TH24152MN1DLwith ducted air handler A4DH2400ME1DT1 of 3 models have all five ratings · AHRI 218331772	54.0(50 is the typical model of its size class) (higher)048-TCQ-MODU-1D32 of 2 models have all five ratings · AHRI 218718736
Ducted, 2.5–3 tons	57.4(50 is the typical model of its size class)A3TH36180OV1DGwith ducted air handler A3DH36000OE1DT3 of 7 models have all five ratings · AHRI 218797045	79.9(50 is the typical model of its size class) (higher)048-TPH-MODU-1D46 of 6 models have all five ratings · AHRI 218718740
Ducted, 3.5–4.5 tons	59.5(50 is the typical model of its size class)A3TH60180OV1DGwith ducted air handler A3DH60000OE1DT4 of 10 models have all five ratings · AHRI 218797046	67.5(50 is the typical model of its size class) (higher)048-TLP-MODU-1D56 of 6 models have all five ratings · AHRI 217568634
Non-ducted, up to 1.5 tons	44.9(50 is the typical model of its size class)ACSH0920VR1-D3with ductless indoor unit AIWH0900VR1-D35 of 5 models have all five ratings · AHRI 217101992	82.6(50 is the typical model of its size class) (higher)048-TPH-MODU-1D355 of 60 models have all five ratings · AHRI 218471007
Non-ducted, 2 tons	24.5(50 is the typical model of its size class)ACSH2419VR1-D3with ductless indoor unit AIWH2400VR1-D31 of 1 models have all five ratings · AHRI 217101991	68.1(50 is the typical model of its size class) (higher)048-MS-24K2VR-22S-MX-OUTwith ductless indoor unit 048-MS-24K2VR-22S-MX-IN12 of 13 models have all five ratings · AHRI 218043770
Non-ducted, 2.5–3 tons	30.4(50 is the typical model of its size class)ACSH3621VR1-D3with ductless indoor unit AIWH3600VR1-D31 of 1 models have all five ratings · AHRI 217101990	83.1(50 is the typical model of its size class) (higher)048-TPH-MODU-1D412 of 12 models have all five ratings · AHRI 218471008
Non-ducted, 3.5–4.5 tons	No models in this size class	70.2(50 is the typical model of its size class)048-TPH-MODU-1D65 of 5 models have all five ratings · AHRI 218471010

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	Airdach	Della
COP at 5°F	beats 86% · 2.30A4TH42152MN1DLDucted, 3.5–4.5 tons	beats 89% · 2.27048-MS-24K2VR-21S-OUTNon-ducted, 2 tons
Capacity retention at 5°F	beats 55% · 73%A3TH36180OV1DGDucted, 2.5–3 tons	beats 95% · 105%048-TPH-MODU-1D3Ducted, up to 1.5 tons
HSPF2	beats 64% · 8.8A3TH60180OV1DGDucted, 3.5–4.5 tons	beats 96% · 10.5048-TPH-MODU-1D4Ducted, 2.5–3 tons
SEER2	beats 76% · 18.0A3TH60180OV1DGDucted, 3.5–4.5 tons	beats 99% · 26.5048-TPH-MODU-1D4Non-ducted, 2.5–3 tons
EER2	beats 83% · 12.0A4TH48152MN1DLDucted, 3.5–4.5 tons	beats 97% · 14.0048-TPH-MODU-1D4Non-ducted, 2.5–3 tons
Heating capacity at 5°F	beats 69% · 12,100 Btu/hACSH1820VR1-D3Non-ducted, up to 1.5 tons	beats 98% · 19,800 Btu/h048-TPH-MODU-1D3Non-ducted, up to 1.5 tons

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Airdach vs Della heat pumps