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Brothers vs KeplerX heat pumps

Measured against models of the same size and duct type, KeplerX scores higher on 2 of the 6 ratings. Brothers has 8 outdoor models, KeplerX has 8 outdoor models. Brothers and KeplerX 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.
Brothers and KeplerX 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, KeplerX scores higher on 2 of the 6 ratings.
  • Brothers
  • KeplerX
  • Other ranked manufacturers
BrothersKeplerX

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingBrothersKeplerX
Efficiency index—median —53%median —
COP at 5°F—median —49%median 1.91
Capacity retention at 5°F—median —78%median 82%
HSPF224%median 7.533%median 7.5
SEER217%median 14.322%median 14.3
EER256% (higher)median 11.654% (higher)median 11.5
Heating capacity at 5°F—median —95%median 48,500 Btu/h
Outdoor models88
AHRI certifications2512

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardBrothersKeplerX
CEE 2025 Tier 1 (Split ASHP)0%0 models0%0 models
CEE 2026 Tier 1 (Split ASHP)0%0 models0%0 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)0%0 models0%0 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate0%0 models0%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 · 3 groups where both have models
  • Brothers
  • KeplerX
  • All models of the group
Ducted, up to 1.5 tons2.00884 modelsDucted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 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 typeBrothersKeplerX
Ducted, up to 1.5 tons2 · index —1 · index —
Ducted, 2 tons2 · index —1 · index —
Ducted, 2.5–3 tons4 · index —2 · index —
Ducted, 3.5–4.5 tonsNone4 · index 53%

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 typeBrothersCold-climate score, best modelKeplerXCold-climate score, best model
Ducted, up to 1.5 tonsNone on this board (0 of 2 models qualify)None on this board (0 of 1 models qualify)
Ducted, 2 tonsNone on this board (0 of 2 models qualify)None on this board (0 of 1 models qualify)
Ducted, 2.5–3 tonsNone on this board (0 of 4 models qualify)None on this board (0 of 2 models qualify)
Ducted, 3.5–4.5 tonsNo models in this size class71.3(50 is the typical model of its size class)K18HVH60WD2Uwith ducted air handler K18HVH60WD2H1 of 4 models qualify · AHRI 214655291

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 typeBrothersAll-around score, best modelKeplerXAll-around score, best model
Ducted, up to 1.5 tonsNone on this board (0 of 2 models have all five ratings)None on this board (0 of 1 models have all five ratings)
Ducted, 2 tonsNone on this board (0 of 2 models have all five ratings)None on this board (0 of 1 models have all five ratings)
Ducted, 2.5–3 tonsNone on this board (0 of 4 models have all five ratings)None on this board (0 of 2 models have all five ratings)
Ducted, 3.5–4.5 tonsNo models in this size class53.3(50 is the typical model of its size class)K18HVH60WD2Uwith ducted air handler K18HVH60WD2H1 of 4 models have all five ratings · AHRI 214655291

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
RatingBrothersKeplerX
COP at 5°F—beats 49% · 1.91K18HVH60WD2UDucted, 3.5–4.5 tons
Capacity retention at 5°F—beats 75% · 82%K18HVH60WD2UDucted, 3.5–4.5 tons
HSPF2beats 27% · 7.8BRO-24HN5Ducted, 2 tonsbeats 87% · 9.4K18HVH60WD2UDucted, 3.5–4.5 tons
SEER2beats 24% · 15.2BRO-24HN5Ducted, 2 tonsbeats 50% · 15.3K18HVH60WD2UDucted, 3.5–4.5 tons
EER2beats 67% · 11.7BRO-30HN5Ducted, 2.5–3 tonsbeats 68% · 11.5K15HVH42W2VDucted, 3.5–4.5 tons
Heating capacity at 5°F—beats 95% · 48,500 Btu/hK18HVH60WD2UDucted, 3.5–4.5 tons

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