SUNCHILLERS vs TKS heat pumps

Measured against models of the same size and duct type, SUNCHILLERS scores higher on 6 of the 6 ratings. SUNCHILLERS has 8 outdoor models, TKS has 8 outdoor models. SUNCHILLERS and TKS 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.

SUNCHILLERS and TKS 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, SUNCHILLERS scores higher on 6 of the 6 ratings.

SUNCHILLERS
TKS
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	SUNCHILLERS	TKS
Efficiency index	68% (higher)median —	50% (higher)median —
COP at 5°F	50% (higher)median 2.00	34% (higher)median 1.82
Capacity retention at 5°F	45% (higher)median 68%	35% (higher)median 66%
HSPF2	74% (higher)median 10.1	57% (higher)median 9.2
SEER2	88% (higher)median 23.7	66% (higher)median 21.1
EER2	71% (higher)median 12.6	48% (higher)median 10.7
Heating capacity at 5°F	45% (higher)median 19,500 Btu/h	38% (higher)median 17,400 Btu/h
Outdoor models	8	8
AHRI certifications	20	16

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	SUNCHILLERS	TKS
CEE 2025 Tier 1 (Split ASHP)	100%8 models	62.5%5 models
CEE 2026 Tier 1 (Split ASHP)	87.5%7 models	50%4 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	50%4 models	25%2 models
DOE Cold Climate Heat Pump Challenge	0%0 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 · 7 groups where both have models

SUNCHILLERS
TKS
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	SUNCHILLERS	TKS
Ducted, up to 1.5 tons	2 · index 61%	1 · index 59%
Ducted, 2 tons	1 · index 84%	None
Ducted, 2.5–3 tons	3 · index 63%	2 · index 64%
Ducted, 3.5–4.5 tons	1 · index 64%	1 · index 64%
Non-ducted, up to 1.5 tons	3 · index 78%	3 · index 37%
Non-ducted, 2 tons	1 · index 78%	1 · index 27%
Non-ducted, 2.5–3 tons	3 · index 64%	3 · index 52%
Non-ducted, 3.5–4.5 tons	1 · index 56%	1 · index 48%

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	SUNCHILLERSCold-climate score, best model	TKSCold-climate score, best model
Ducted, up to 1.5 tons	67.8(50 is the typical model of its size class) (higher)12WODU-ULwith ducted air handler 12DIDU-UL2 of 2 models qualify · AHRI 208447612	52.0(50 is the typical model of its size class)T2C-18MODU1 of 1 models qualify · AHRI 214594924
Ducted, 2 tons	80.3(50 is the typical model of its size class)24WODU-ULwith ducted air handler 24DIDU-UL1 of 1 models qualify · AHRI 208447613	No models in this size class
Ducted, 2.5–3 tons	None on this board (0 of 3 models qualify)	57.4(50 is the typical model of its size class)T3C-27MODU1 of 2 models qualify · AHRI 214594927
Ducted, 3.5–4.5 tons	None on this board (0 of 1 models qualify)	None on this board (0 of 1 models qualify)
Non-ducted, up to 1.5 tons	86.0(50 is the typical model of its size class)9WODU-ULwith ductless indoor unit 9WIDU-UL2 of 3 models qualify · AHRI 208447609	None on this board (0 of 3 models qualify)
Non-ducted, 2 tons	60.4(50 is the typical model of its size class)24WODU-ULwith ductless indoor unit 24WIDU-UL1 of 1 models qualify · AHRI 208447611	None on this board (0 of 1 models qualify)
Non-ducted, 2.5–3 tons	None on this board (0 of 3 models qualify)	49.3(50 is the typical model of its size class)T3C-27MODU1 of 3 models qualify · AHRI 214594926
Non-ducted, 3.5–4.5 tons	None on this board (0 of 1 models qualify)	None on this board (0 of 1 models qualify)

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	SUNCHILLERSAll-around score, best model	TKSAll-around score, best model
Ducted, up to 1.5 tons	61.5(50 is the typical model of its size class) (higher)12WODU-ULwith ducted air handler 12DIDU-UL2 of 2 models have all five ratings · AHRI 208447612	59.4(50 is the typical model of its size class)T2C-18MODU1 of 1 models have all five ratings · AHRI 214594924
Ducted, 2 tons	83.8(50 is the typical model of its size class)24WODU-ULwith ducted air handler 24DIDU-UL1 of 1 models have all five ratings · AHRI 208447613	No models in this size class
Ducted, 2.5–3 tons	75.4(50 is the typical model of its size class) (higher)M27ODU-UL2P3 of 3 models have all five ratings · AHRI 207804190	71.5(50 is the typical model of its size class)T3C-27MODU2 of 2 models have all five ratings · AHRI 214594927
Ducted, 3.5–4.5 tons	63.5(50 is the typical model of its size class)M48ODU-UL2P1 of 1 models have all five ratings · AHRI 207804196	63.5(50 is the typical model of its size class)T5C-48MODU1 of 1 models have all five ratings · AHRI 214594933
Non-ducted, up to 1.5 tons	88.4(50 is the typical model of its size class) (higher)9WODU-ULwith ductless indoor unit 9WIDU-UL3 of 3 models have all five ratings · AHRI 208447609	52.0(50 is the typical model of its size class)T2C-18MODU3 of 3 models have all five ratings · AHRI 214594923
Non-ducted, 2 tons	77.5(50 is the typical model of its size class) (higher)24WODU-ULwith ductless indoor unit 24WIDU-UL1 of 1 models have all five ratings · AHRI 208447611	27.2(50 is the typical model of its size class)TWS-24ODUwith ductless indoor unit TWS-24IDU1 of 1 models have all five ratings · AHRI 214594921
Non-ducted, 2.5–3 tons	78.2(50 is the typical model of its size class) (higher)M27ODU-UL2P3 of 3 models have all five ratings · AHRI 207804189	66.7(50 is the typical model of its size class)T3C-27MODU3 of 3 models have all five ratings · AHRI 214594926
Non-ducted, 3.5–4.5 tons	56.1(50 is the typical model of its size class) (higher)M48ODU-UL2P1 of 1 models have all five ratings · AHRI 207804195	48.3(50 is the typical model of its size class)T5C-48MODU1 of 1 models have all five ratings · AHRI 214594932

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	SUNCHILLERS	TKS
COP at 5°F	beats 97% · 2.3912WODU-ULNon-ducted, up to 1.5 tons	beats 87% · 2.01TWS-36ODUNon-ducted, 2.5–3 tons
Capacity retention at 5°F	beats 71% · 86%9WODU-ULNon-ducted, up to 1.5 tons	beats 55% · 71%T3C-27MODUDucted, 2.5–3 tons
HSPF2	beats 98% · 11.224WODU-ULDucted, 2 tons	beats 95% · 9.7T5C-48MODUDucted, 3.5–4.5 tons
SEER2	beats 99% · 24.6M27ODU-UL2PNon-ducted, 2.5–3 tons	beats 98% · 21.0T3C-27MODUDucted, 2.5–3 tons
EER2	beats 97% · 14.024WODU-ULNon-ducted, 2 tons	beats 75% · 12.2T3C-27MODUNon-ducted, 2.5–3 tons
Heating capacity at 5°F	beats 85% · 14,000 Btu/hM18ODU-UL2PNon-ducted, up to 1.5 tons	beats 75% · 12,900 Btu/hT2C-18MODUNon-ducted, up to 1.5 tons

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