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.

AIR TECH and UA United Appliances 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, AIR TECH scores higher on 6 of the 6 ratings.

AIR TECH
UA United Appliances
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 9, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	AIR TECH	UA United Appliances
Efficiency index	70% (higher)median —	40% (higher)median —
COP at 5°F	57% (higher)median 2.00	29% (higher)median 1.80
Capacity retention at 5°F	75% (higher)median 96%	41% (higher)median 74%
HSPF2	67% (higher)median 9.5	55% (higher)median 10.0
SEER2	83% (higher)median 22.0	53% (higher)median 20.0
EER2	64% (higher)median 11.6	24% (higher)median 10.5
Heating capacity at 5°F	78% (higher)median 33,000 Btu/h	43% (higher)median 16,000 Btu/h
Outdoor models	13	13
AHRI certifications	27	13

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	AIR TECH	UA United Appliances
CEE 2025 Tier 1 (Split ASHP)	92.3%12 models	53.8%7 models
CEE 2026 Tier 1 (Split ASHP)	92.3%12 models	53.8%7 models
CEE Advanced Tier (Split ASHP)	7.7%1 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	92.3%12 models	61.5%8 models
DOE Cold Climate Heat Pump Challenge	7.7%1 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 · 6 groups where both have models

AIR TECH
UA United Appliances
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 9, 2026

Models per peer group · efficiency index within the group
Size and duct type	AIR TECH	UA United Appliances
Ducted, up to 1.5 tons	2 · index 69%	None
Ducted, 2 tons	2 · index 67%	None
Ducted, 2.5–3 tons	4 · index 69%	1 · index 39%
Ducted, 3.5–4.5 tons	4 · index 67%	1 · index 42%
Ducted, 5 tons and up	1 · index 56%	None
Non-ducted, up to 1.5 tons	1 · index 74%	6 · index 39%
Non-ducted, 2 tons	1 · index 85%	1 · index 27%
Non-ducted, 2.5–3 tons	2 · index 77%	3 · index 42%
Non-ducted, 3.5–4.5 tons	2 · index 71%	1 · index 50%
Non-ducted, 5 tons and up	1 · index 69%	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	AIR TECHCold-climate score, best model	UA United AppliancesCold-climate score, best model
Ducted, up to 1.5 tons	74.7(50 is the typical model of its size class)ATMO18AXR322 of 2 models qualify · AHRI 217489302	No models in this size class
Ducted, 2 tons	63.0(50 is the typical model of its size class)ATMO24AXR322 of 2 models qualify · AHRI 217489303	No models in this size class
Ducted, 2.5–3 tons	72.6(50 is the typical model of its size class)ATCO36AXR32with ducted air handler ATCD36AXR324 of 4 models qualify · AHRI 217221446	None on this board (0 of 1 models qualify)
Ducted, 3.5–4.5 tons	76.8(50 is the typical model of its size class) (higher)ATMO42AXR324 of 4 models qualify · AHRI 217489305	50.3(50 is the typical model of its size class)UADH60-DD6SG1/Owith ducted air handler UADH60-DD6SG1/I1 of 1 models qualify · AHRI 218719022
Ducted, 5 tons and up	65.9(50 is the typical model of its size class)ATVO60GRR321 of 1 models qualify · AHRI 218618846	No models in this size class
Non-ducted, up to 1.5 tons	82.7(50 is the typical model of its size class) (higher)ATMO18AXR321 of 1 models qualify · AHRI 217489298	62.1(50 is the typical model of its size class)UAUH18-DD6SG1/O5 of 6 models qualify · AHRI 218404664
Non-ducted, 2 tons	84.4(50 is the typical model of its size class)ATMO24AXR321 of 1 models qualify · AHRI 217489299	None on this board (0 of 1 models qualify)
Non-ducted, 2.5–3 tons	73.3(50 is the typical model of its size class) (higher)ATMO36AXR322 of 2 models qualify · AHRI 217489300	55.0(50 is the typical model of its size class)UAUH24-DD6SG1/O2 of 3 models qualify · AHRI 218404665
Non-ducted, 3.5–4.5 tons	59.9(50 is the typical model of its size class) (higher)ATMO42AXR322 of 2 models qualify · AHRI 217489309	33.3(50 is the typical model of its size class)UAUH42-DD6SG1/O1 of 1 models qualify · AHRI 218404667
Non-ducted, 5 tons and up	53.2(50 is the typical model of its size class)ATVO60GRR321 of 1 models qualify · AHRI 218618845	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	AIR TECHAll-around score, best model	UA United AppliancesAll-around score, best model
Ducted, up to 1.5 tons	79.1(50 is the typical model of its size class)ATMO18AXR322 of 2 models have all five ratings · AHRI 217489302	No models in this size class
Ducted, 2 tons	78.5(50 is the typical model of its size class)ATMO24AXR322 of 2 models have all five ratings · AHRI 217489303	No models in this size class
Ducted, 2.5–3 tons	81.2(50 is the typical model of its size class) (higher)ATMO36AXR324 of 4 models have all five ratings · AHRI 217489304	38.5(50 is the typical model of its size class)UADH36-DD6SG1/Owith ducted air handler UADH36-DD6SG1/I1 of 1 models have all five ratings · AHRI 218719021
Ducted, 3.5–4.5 tons	87.0(50 is the typical model of its size class) (higher)ATMO42AXR324 of 4 models have all five ratings · AHRI 217489305	41.7(50 is the typical model of its size class)UADH60-DD6SG1/Owith ducted air handler UADH60-DD6SG1/I1 of 1 models have all five ratings · AHRI 218719022
Ducted, 5 tons and up	55.6(50 is the typical model of its size class)ATVO60GRR321 of 1 models have all five ratings · AHRI 218618846	No models in this size class
Non-ducted, up to 1.5 tons	74.3(50 is the typical model of its size class) (higher)ATMO18AXR321 of 1 models have all five ratings · AHRI 217489298	62.2(50 is the typical model of its size class)UAUH18-DD6SG1/O6 of 6 models have all five ratings · AHRI 218404664
Non-ducted, 2 tons	85.3(50 is the typical model of its size class) (higher)ATMO24AXR321 of 1 models have all five ratings · AHRI 217489299	27.4(50 is the typical model of its size class)UAWH24-DD6G1/Owith ductless indoor unit UAWH24-DD6G1/I1 of 1 models have all five ratings · AHRI 218404662
Non-ducted, 2.5–3 tons	78.3(50 is the typical model of its size class) (higher)ATMO36AXR322 of 2 models have all five ratings · AHRI 217489300	55.0(50 is the typical model of its size class)UAUH36-DD6SG1/O3 of 3 models have all five ratings · AHRI 218404666
Non-ducted, 3.5–4.5 tons	74.4(50 is the typical model of its size class) (higher)ATMO42AXR322 of 2 models have all five ratings · AHRI 217489309	49.6(50 is the typical model of its size class)UAUH42-DD6SG1/O1 of 1 models have all five ratings · AHRI 218404667
Non-ducted, 5 tons and up	68.8(50 is the typical model of its size class)ATVO60GRR321 of 1 models have all five ratings · AHRI 218618845	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	AIR TECH	UA United Appliances
COP at 5°F	beats 99% · 2.40ATVO36GRR32Non-ducted, 2.5–3 tons	beats 63% · 2.00UAUH18-DD6SG1/ONon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 98% · 108%ATMO24AXR32Non-ducted, 2 tons	beats 61% · 80%UAWH09-AD6G1/ONon-ducted, up to 1.5 tons
HSPF2	beats 96% · 11.0ATMO36AXR32Non-ducted, 2.5–3 tons	beats 64% · 10.0UAWH12-AD6G1/OAlso listed as UAWH12-DD6G1/ONon-ducted, up to 1.5 tons
SEER2	beats 100% · 22.0ATMO42AXR32Ducted, 3.5–4.5 tons	beats 94% · 24.0UAUH42-DD6SG1/ONon-ducted, 3.5–4.5 tons
EER2	beats 99% · 14.5ATVO36GRR32Non-ducted, 2.5–3 tons	beats 56% · 12.5UAWH09-DD6G1/ONon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 99% · 21,800 Btu/hATMO18AXR32Non-ducted, up to 1.5 tons	beats 83% · 14,000 Btu/hUAUH18-DD6SG1/ONon-ducted, up to 1.5 tons

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AIR TECH vs UA United Appliances heat pumps