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Endura vs THERMOFLUX heat pumps

Measured against models of the same size and duct type, Endura scores higher on 5 of the 6 ratings. Endura has 9 outdoor models, THERMOFLUX has 9 outdoor models. Endura and THERMOFLUX have no QMID on file and are not ranked.

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CompareData as of updated · 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.
Endura and THERMOFLUX 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, Endura scores higher on 5 of the 6 ratings.
  • Endura
  • THERMOFLUX
  • Other ranked manufacturers
EnduraTHERMOFL…

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingEnduraTHERMOFLUX
Efficiency index63% (higher)median —43% (higher)median —
COP at 5°F47% (higher)median 1.9925% (higher)median 1.80
Capacity retention at 5°F73% (higher)median 77%66% (higher)median 75%
HSPF257%median 9.061%median 8.1
SEER269% (higher)median 19.050% (higher)median 15.2
EER266% (higher)median 12.022% (higher)median 10.0
Heating capacity at 5°F69% (higher)median 36,000 Btu/h67% (higher)median 36,000 Btu/h
Outdoor models99
AHRI certifications259

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardEnduraTHERMOFLUX
CEE 2025 Tier 1 (Split ASHP)100%9 models44.4%4 models
CEE 2026 Tier 1 (Split ASHP)100%9 models44.4%4 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)100%9 models44.4%4 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate100%9 models44.4%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
  • Endura
  • THERMOFLUX
  • All models of the group
Ducted, up to 1.5 tons1.901,783 modelsDucted, 2 tons2.001,090 modelsDucted, 2.5–3 tons2.001,909 modelsDucted, 3.5–4.5 tons2.002,224 modelsDucted, 5 tons and up2.00321 modelsNon-ducted, up to 1.5 tons1.953,455 modelsNon-ducted, 2.5–3 tons2.001,106 modelsNon-ducted, 3.5–4.5 tons2.00564 modelsmedian

Raw ratings are only placed side by side within one size and duct type, where they are comparable.

Source: AHRI Directory · as of

Models per peer group · efficiency index within the group
Size and duct typeEnduraTHERMOFLUX
Ducted, up to 1.5 tons1 · index 65%None
Ducted, 2 tons1 · index 44%2 · index 47%
Ducted, 2.5–3 tons4 · index 63%3 · index 37%
Ducted, 3.5–4.5 tons2 · index 71%4 · index 46%
Ducted, 5 tons and up1 · index 81%None
Non-ducted, up to 1.5 tons1 · index 69%None
Non-ducted, 2.5–3 tons2 · index 63%None
Non-ducted, 3.5–4.5 tons1 · index 44%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 typeEnduraCold-climate score, best modelTHERMOFLUXCold-climate score, best model
Ducted, up to 1.5 tons66.2(50 is the typical model of its size class)HBEFLM2-OD181 of 1 models qualify · AHRI 218457862No models in this size class
Ducted, 2 tons82.1(50 is the typical model of its size class) (higher)HBEFU-24R454Bwith ducted air handler HBEC-FC24R454B1 of 1 models qualify · AHRI 21845784568.9(50 is the typical model of its size class)TMFS24HDI2NAJ0H26with ducted air handler TMFS24IDI2NAJ0H261 of 2 models qualify · AHRI 218787998
Ducted, 2.5–3 tons87.9(50 is the typical model of its size class) (higher)HBEFU-36R454Bwith ducted air handler HBEC-FC36R454B4 of 4 models qualify · AHRI 21845784664.5(50 is the typical model of its size class)TMFS36HDI2NAJ0H26with ducted air handler TMFS36IDI2NAJ0H261 of 3 models qualify · AHRI 218787999
Ducted, 3.5–4.5 tons77.3(50 is the typical model of its size class) (higher)HBEFU-48R454Bwith ducted air handler HBEC-FC48R454B2 of 2 models qualify · AHRI 21845784769.4(50 is the typical model of its size class)TMFS48HDI2NAJ0H26with ducted air handler TMFS48IDI2NAJ0H264 of 4 models qualify · AHRI 218788000
Ducted, 5 tons and up88.7(50 is the typical model of its size class)HBEFU-60R454Bwith ducted air handler HBEC-FC60R454B1 of 1 models qualify · AHRI 218457848No models in this size class
Non-ducted, up to 1.5 tons69.5(50 is the typical model of its size class)HBEFLM2-OD181 of 1 models qualify · AHRI 218457861No models in this size class
Non-ducted, 2.5–3 tons53.7(50 is the typical model of its size class)HBEFLM4-OD362 of 2 models qualify · AHRI 218457871No models in this size class
Non-ducted, 3.5–4.5 tons16.4(50 is the typical model of its size class)HBEFLM5-OD421 of 1 models qualify · AHRI 218457868No 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 typeEnduraAll-around score, best modelTHERMOFLUXAll-around score, best model
Ducted, up to 1.5 tons64.6(50 is the typical model of its size class)HBEFLM2-OD181 of 1 models have all five ratings · AHRI 218457862No models in this size class
Ducted, 2 tons79.5(50 is the typical model of its size class) (higher)HBEFU-24R454Bwith ducted air handler HBEC-FC24R454B1 of 1 models have all five ratings · AHRI 21845784570.0(50 is the typical model of its size class)TMFS24HDI2NAJ0H26with ducted air handler TMFS24IDI2NAJ0H262 of 2 models have all five ratings · AHRI 218787998
Ducted, 2.5–3 tons82.3(50 is the typical model of its size class) (higher)HBEFU-36R454Bwith ducted air handler HBEC-FC36R454B4 of 4 models have all five ratings · AHRI 21845784657.9(50 is the typical model of its size class)TMFS36HDI2NAJ0H26with ducted air handler TMFS36IDI2NAJ0H263 of 3 models have all five ratings · AHRI 218787999
Ducted, 3.5–4.5 tons82.3(50 is the typical model of its size class) (higher)HBEFU-48R454Bwith ducted air handler HBEC-FC48R454B2 of 2 models have all five ratings · AHRI 21845784765.0(50 is the typical model of its size class)TMFS48HDI2NAJ0H26with ducted air handler TMFS48IDI2NAJ0H264 of 4 models have all five ratings · AHRI 218788000
Ducted, 5 tons and up81.1(50 is the typical model of its size class)HBEFU-60R454Bwith ducted air handler HBEC-FC60R454B1 of 1 models have all five ratings · AHRI 218457848No models in this size class
Non-ducted, up to 1.5 tons69.2(50 is the typical model of its size class)HBEFLM2-OD181 of 1 models have all five ratings · AHRI 218457861No models in this size class
Non-ducted, 2.5–3 tons64.2(50 is the typical model of its size class)HBEFLM3-OD272 of 2 models have all five ratings · AHRI 218457864No models in this size class
Non-ducted, 3.5–4.5 tons43.7(50 is the typical model of its size class)HBEFLM5-OD421 of 1 models have all five ratings · AHRI 218457868No 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
RatingEnduraTHERMOFLUX
COP at 5°Fbeats 98% · 2.42HBEFU-60R454BDucted, 5 tons and upbeats 32% · 1.85TMFS48HDI2NAJ0H26Ducted, 3.5–4.5 tons
Capacity retention at 5°Fbeats 94% · 75%HBEFU-60R454BDucted, 5 tons and upbeats 94% · 100%TMFS48HDI2NAJ0H26Ducted, 3.5–4.5 tons
HSPF2beats 96% · 10.5HBEFU-36R454BDucted, 2.5–3 tonsbeats 81% · 10.0TMFS24HDI2NAJ0H26Ducted, 2 tons
SEER2beats 95% · 19.0HBEFU-60R454BDucted, 5 tons and upbeats 76% · 18.0TMFS48HDI2NAJ0H26Ducted, 3.5–4.5 tons
EER2beats 94% · 12.9HBEFLM4-OD36Ducted, 2.5–3 tonsbeats 60% · 12.0TMFS24HDI2NAJ0H26Ducted, 2 tons
Heating capacity at 5°Fbeats 93% · 18,000 Btu/hHBEFLM2-OD18Non-ducted, up to 1.5 tonsbeats 91% · 50,000 Btu/hTMFS55HDI2NAJ0H26Ducted, 3.5–4.5 tons

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