AIRDACH vs Della heat pumps

Measured against models of the same size and duct type, AIRDACH scores higher on 6 of the 6 ratings. AIRDACH has 23 outdoor models, Della has 22 outdoor models. AIRDACH has no QMID on file and is not ranked.

New to heat pump ratings? The Simple view explains them in plain words →

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.

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, AIRDACH scores higher on 6 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	57% (higher)median —	39% (higher)median — · 27th ranked
COP at 5°F	47% (higher)median 1.91	42% (higher)median 1.80 · 25th ranked
Capacity retention at 5°F	39% (higher)median 67%	37% (higher)median 70% · 26th ranked
HSPF2	49% (higher)median 8.1	23% (higher)median 8.5 · 27th ranked
SEER2	54% (higher)median 16.0	35% (higher)median 19.0 · 27th ranked
EER2	58% (higher)median 11.7	28% (higher)median 10.0 · 27th ranked
Heating capacity at 5°F	41% (higher)median 14,000 Btu/h	37% (higher)median 11,600 Btu/h · 26th ranked
Outdoor models	23	22
AHRI certifications	34	22

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)	39.1%9 models	54.5%12 models
CEE 2026 Tier 1 (Split ASHP)	39.1%9 models	45.5%10 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	21.7%5 models	36.4%8 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	0%0 models	18.2%4 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 · 3 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 57%	None
Ducted, 2 tons	2 · index —	None
Ducted, 2.5–3 tons	5 · index 66%	None
Ducted, 3.5–4.5 tons	6 · index 64%	None
Non-ducted, up to 1.5 tons	6 · index 58%	16 · index 43%
Non-ducted, 2 tons	1 · index 56%	3 · index 39%
Non-ducted, 2.5–3 tons	4 · index 50%	3 · index 27%
Non-ducted, 3.5–4.5 tons	1 · index 52%	None

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	46.5(50 is the typical model of its size class)AMSH1800VM1-D1 of 2 models qualify · AHRI 210474672	No models in this size class
Ducted, 2 tons	None on this board (0 of 2 models qualify)	No models in this size class
Ducted, 2.5–3 tons	None on this board (0 of 5 models qualify)	No models in this size class
Ducted, 3.5–4.5 tons	None on this board (0 of 6 models qualify)	No models in this size class
Non-ducted, up to 1.5 tons	70.6(50 is the typical model of its size class) (higher)ACSH1823VM2-Dwith ductless indoor unit AIWH1800VM2-D3 of 6 models qualify · AHRI 209948207	68.8(50 is the typical model of its size class)048-TP-12K2V-23S-OUTwith ductless indoor unit 048-TP-12K2V-23S-IN8 of 16 models qualify · AHRI 213927343
Non-ducted, 2 tons	None on this board (0 of 1 models qualify)	None on this board (0 of 3 models qualify)
Non-ducted, 2.5–3 tons	50.1(50 is the typical model of its size class)AMSH2700VM1-D1 of 4 models qualify · AHRI 210474674	None on this board (0 of 3 models qualify)
Non-ducted, 3.5–4.5 tons	39.4(50 is the typical model of its size class)AMSH4800VM1-D1 of 1 models qualify · AHRI 210474680	No models in this size class

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	56.7(50 is the typical model of its size class)AMSH1800VM1-D1 of 2 models have all five ratings · AHRI 210474672	No models in this size class
Ducted, 2 tons	None on this board (0 of 2 models have all five ratings)	No models in this size class
Ducted, 2.5–3 tons	75.5(50 is the typical model of its size class)AMSH2700VM1-D2 of 5 models have all five ratings · AHRI 210474675	No models in this size class
Ducted, 3.5–4.5 tons	63.5(50 is the typical model of its size class)AMSH4800VM1-D1 of 6 models have all five ratings · AHRI 210474681	No models in this size class
Non-ducted, up to 1.5 tons	75.9(50 is the typical model of its size class) (higher)ACSH1823VM2-Dwith ductless indoor unit AIWH1800VM2-D6 of 6 models have all five ratings · AHRI 209948207	70.8(50 is the typical model of its size class)048-TP-12K2V-23S-OUTwith ductless indoor unit 048-TP-12K2V-23S-IN10 of 16 models have all five ratings · AHRI 213927343
Non-ducted, 2 tons	56.2(50 is the typical model of its size class) (higher)ACSH2421VM2-Dwith ductless indoor unit AIWH2400VM2-D1 of 1 models have all five ratings · AHRI 209948204	53.0(50 is the typical model of its size class)048-TP-24K2V-20S-OUTwith ductless indoor unit 048-TP-24K2V-20S-IN2 of 3 models have all five ratings · AHRI 213927345
Non-ducted, 2.5–3 tons	67.1(50 is the typical model of its size class) (higher)AMSH2700VM1-D3 of 4 models have all five ratings · AHRI 210474674	29.5(50 is the typical model of its size class)048-TL-36K-MODU3 of 3 models have all five ratings · AHRI 211042067
Non-ducted, 3.5–4.5 tons	51.7(50 is the typical model of its size class)AMSH4800VM1-D1 of 1 models have all five ratings · AHRI 210474680	No models in this size class

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 96% · 2.38ACSH1823VM2-DNon-ducted, up to 1.5 tons	beats 89% · 2.21048-TP-18K2V-22S-OUTNon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 67% · 80%ACSH0924VM2-DNon-ducted, up to 1.5 tons	beats 64% · 77%048-TP-9K2V-23S-OUTNon-ducted, up to 1.5 tons
HSPF2	beats 95% · 9.7AMSH4800VM1-DDucted, 3.5–4.5 tons	beats 57% · 9.5048-TP-12K2V-23S-OUTNon-ducted, up to 1.5 tons
SEER2	beats 98% · 21.0AMSH2700VM1-DDucted, 2.5–3 tons	beats 79% · 23.5048-TP-9K2V-23S-OUTNon-ducted, up to 1.5 tons
EER2	beats 85% · 14.0ACSH0924VM2-DNon-ducted, up to 1.5 tons	beats 68% · 13.0048-TP-9K2V-23S-OUTNon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 85% · 14,000 Btu/hAMSH1800VM1-DNon-ducted, up to 1.5 tons	beats 78% · 13,000 Btu/h048-TL-18K-MODUNon-ducted, up to 1.5 tons

More comparisons

Pick any two manufacturers