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.

TCL 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, Viessmann scores higher on 5 of the 6 ratings.

TCL
Viessmann
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	TCL	Viessmann
Efficiency index	49%median —	60%median —
COP at 5°F	36%median 1.89	53%median 2.00
Capacity retention at 5°F	50%median 75%	72%median 88%
HSPF2	52%median 9.5	74%median 9.5
SEER2	59%median 20.0	59%median 17.0
EER2	41%median 11.2	49%median 11.0
Heating capacity at 5°F	51%median 17,000 Btu/h	74%median 25,000 Btu/h
Outdoor models	177	43
AHRI certifications	636	170

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	TCL	Viessmann
CEE 2025 Tier 1 (Split ASHP)	75.7%134 models	83.7%36 models
CEE 2026 Tier 1 (Split ASHP)	75.7%134 models	83.7%36 models
CEE Advanced Tier (Split ASHP)	0%0 models	4.7%2 models
Xcel Energy Colorado cold-climate ASHP (2025)	72.3%128 models	79.1%34 models
DOE Cold Climate Heat Pump Challenge	0%0 models	4.7%2 models
ENERGY STAR Cold Climate	64.4%114 models	69.8%30 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 · 8 groups where both have models

TCL
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	TCL	Viessmann
Ducted, up to 1.5 tons	10 · index 62%	8 · index 67%
Ducted, 2 tons	11 · index 49%	7 · index 59%
Ducted, 2.5–3 tons	19 · index 59%	16 · index 55%
Ducted, 3.5–4.5 tons	22 · index 51%	11 · index 57%
Non-ducted, up to 1.5 tons	86 · index 47%	5 · index 77%
Non-ducted, 2 tons	18 · index 41%	2 · index 79%
Non-ducted, 2.5–3 tons	29 · index 47%	6 · index 57%
Non-ducted, 3.5–4.5 tons	12 · index 46%	4 · index 52%

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	TCLCold-climate score, best model	ViessmannCold-climate score, best model
Ducted, up to 1.5 tons	67.5(50 is the typical model of its size class)H18TDHXPCwith ducted air handler H18FAHUDE10 of 10 models qualify · AHRI 218332482	86.7(50 is the typical model of its size class) (higher)D5CUHAH18AAKwith ducted air handler D5MUWAQ18XA37 of 8 models qualify · AHRI 218668521
Ducted, 2 tons	70.0(50 is the typical model of its size class)H24TDHXPCwith ducted air handler H24FAHUDE11 of 12 models qualify · AHRI 218332483	85.7(50 is the typical model of its size class) (higher)D5CSHAH24AAKwith ducted air handler D5FSDAH24XHK7 of 7 models qualify · AHRI 217178805
Ducted, 2.5–3 tons	67.2(50 is the typical model of its size class)H30TDHXPCwith ducted air handler H30FAHUDE16 of 18 models qualify · AHRI 218332484	83.2(50 is the typical model of its size class) (higher)D5CMHAH36EAK11 of 16 models qualify · AHRI 217178827
Ducted, 3.5–4.5 tons	69.4(50 is the typical model of its size class)H48SDH20XQCwith ducted air handler H48APH20UDEAlso listed as THH48HDI2NAJ0H2621 of 22 models qualify · AHRI 218453819	82.7(50 is the typical model of its size class) (higher)D5CMHAH48FAK10 of 11 models qualify · AHRI 217178830
Non-ducted, up to 1.5 tons	70.9(50 is the typical model of its size class)TMH18HEI2NAS0U25Also listed as H18FMHD3XPC, TMH18HEI2NAS0U2566 of 86 models qualify · AHRI 218028413	96.7(50 is the typical model of its size class) (higher)D5CSHAH06AAKwith ductless indoor unit D5FSHAH06XAK5 of 5 models qualify · AHRI 217178781
Non-ducted, 2 tons	61.6(50 is the typical model of its size class)H24SBH23XQCwith ductless indoor unit H24SBH23XQE11 of 19 models qualify · AHRI 218451106	89.4(50 is the typical model of its size class) (higher)D5CSHAH24AAKwith ductless indoor unit D5FSCAH24XAK2 of 2 models qualify · AHRI 217178803
Non-ducted, 2.5–3 tons	68.0(50 is the typical model of its size class)TMH27HEI2NAS0U25Also listed as H27FMHD4XPC, TMH27HEI2NAS0U2519 of 28 models qualify · AHRI 218028414	89.4(50 is the typical model of its size class) (higher)D5CLHAH36AAKwith ductless indoor unit D5FCFAH36XAK4 of 6 models qualify · AHRI 217178810
Non-ducted, 3.5–4.5 tons	48.1(50 is the typical model of its size class)TMH48HEI2NAS0U25Also listed as H48FMHD6XPC11 of 12 models qualify · AHRI 218028416	75.5(50 is the typical model of its size class) (higher)D5CMHAH48FAK4 of 4 models qualify · AHRI 217178831

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	TCLAll-around score, best model	ViessmannAll-around score, best model
Ducted, up to 1.5 tons	72.9(50 is the typical model of its size class)TMH18HEI2NAS0U25*Also listed as H18FMHD3XPC10 of 10 models have all five ratings · AHRI 218625046	87.4(50 is the typical model of its size class) (higher)D5CSHAH09AAKwith ducted air handler D5FSDAH12XAK8 of 8 models have all five ratings · AHRI 217178787
Ducted, 2 tons	70.0(50 is the typical model of its size class)THH24HDI2NAJ0H26with ducted air handler THH24IDI2NAJ0H2613 of 13 models have all five ratings · AHRI 218467218	80.0(50 is the typical model of its size class) (higher)D5CSHAH24AAKwith ducted air handler D5FSDAH24XHK7 of 7 models have all five ratings · AHRI 217178805
Ducted, 2.5–3 tons	80.5(50 is the typical model of its size class)TMH27HEI2NAS0U25*17 of 17 models have all five ratings · AHRI 218625047	85.5(50 is the typical model of its size class) (higher)D5CMHAH30EAK16 of 16 models have all five ratings · AHRI 217178824
Ducted, 3.5–4.5 tons	67.5(50 is the typical model of its size class)TMH42HEI2NAM0U24Also listed as H42FMH20XPC22 of 22 models have all five ratings · AHRI 215351200	84.6(50 is the typical model of its size class) (higher)D5CMHAH48FAK11 of 11 models have all five ratings · AHRI 217178830
Non-ducted, up to 1.5 tons	82.6(50 is the typical model of its size class)TMH18HEI2NAS0U25Also listed as H18FMHD3XPC, TMH18HEI2NAS0U2580 of 87 models have all five ratings · AHRI 218028413	96.5(50 is the typical model of its size class) (higher)D5CSHAH06AAKwith ductless indoor unit D5FSHAH06XAK5 of 5 models have all five ratings · AHRI 217178781
Non-ducted, 2 tons	64.8(50 is the typical model of its size class)H24SBH23XQCwith ductless indoor unit H24SBH23XQE16 of 17 models have all five ratings · AHRI 218451106	78.7(50 is the typical model of its size class) (higher)D5CSHAH24AAKwith ductless indoor unit D5FSHAH24XAK2 of 2 models have all five ratings · AHRI 217178802
Non-ducted, 2.5–3 tons	83.1(50 is the typical model of its size class)TMH27HEI2NAS0U25Also listed as H27FMHD4XPC, TMH27HEI2NAS0U2528 of 29 models have all five ratings · AHRI 218028414	85.8(50 is the typical model of its size class) (higher)D5CMHAH30EAK6 of 6 models have all five ratings · AHRI 217178823
Non-ducted, 3.5–4.5 tons	70.2(50 is the typical model of its size class)TMH48HEI2NAS0U25Also listed as H48FMHD6XPC12 of 12 models have all five ratings · AHRI 218028416	76.7(50 is the typical model of its size class) (higher)D5CMHAH48FAK4 of 4 models have all five ratings · AHRI 217178829

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	TCL	Viessmann
COP at 5°F	beats 88% · 2.25TSH24HDI2NAL0B25Also listed as H24SVH20XQCNon-ducted, 2 tons	beats 97% · 2.40D5CSHAH06AAKNon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 99% · 125%H24TDHXPCDucted, 2 tons	beats 100% · 116%D5CMHAH30EAKNon-ducted, 2.5–3 tons
HSPF2	beats 96% · 10.5TMH27HEI2NAS0U25*Ducted, 2.5–3 tons	beats 99% · 14.8D5CSHAH06AAKNon-ducted, up to 1.5 tons
SEER2	beats 99% · 26.5TMH27HEI2NAS0U25Also listed as H27FMHD4XPC, TMH27HEI2NAS0U25Non-ducted, 2.5–3 tons	beats 99% · 20.5D5CMHAH48FAKDucted, 3.5–4.5 tons
EER2	beats 97% · 14.0TMH27HEI2NAS0U25Also listed as H27FMHD4XPC, TMH27HEI2NAS0U25Non-ducted, 2.5–3 tons	beats 99% · 18.0D5CSHAH06AAKNon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 99% · 30,000 Btu/hH24TDHXPCDucted, 2 tons	beats 98% · 19,600 Btu/hD5CUHAH18AAKDucted, up to 1.5 tons

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TCL vs Viessmann heat pumps