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Bosch vs COSTWAY heat pumps

Measured against models of the same size and duct type, Bosch scores higher on 5 of the 6 ratings. Bosch has 50 outdoor models, COSTWAY has 3 outdoor models.

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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.
Bosch and COSTWAY 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, Bosch scores higher on 5 of the 6 ratings.
  • Bosch
  • COSTWAY
  • Other ranked manufacturers
BoschCOSTWAY

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingBoschCOSTWAY
Efficiency index65% (higher)median — · 4th ranked48% (higher)median —
COP at 5°F55% (higher)median 2.00 · 12th ranked21% (higher)median 1.80
Capacity retention at 5°F60% (higher)median 73% · 8th ranked33% (higher)median 65%
HSPF269% (higher)median 9.3 · 4th ranked46% (higher)median 9.0
SEER270%median 19.2 · 2nd ranked76%median 22.0
EER258% (higher)median 11.7 · 8th ranked50% (higher)median 12.0
Heating capacity at 5°F56% (higher)median 20,000 Btu/h · 12th ranked55% (higher)median 16,200 Btu/h
Outdoor models503
AHRI certifications1,5603

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardBoschCOSTWAY
CEE 2025 Tier 1 (Split ASHP)76%38 models100%3 models
CEE 2026 Tier 1 (Split ASHP)76%38 models100%3 models
CEE Advanced Tier (Split ASHP)2%1 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)64%32 models33.3%1 models
DOE Cold Climate Heat Pump Challenge2%1 models0%0 models
ENERGY STAR Cold Climate30%15 models33.3%1 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
  • Bosch
  • COSTWAY
  • 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 modelsDucted, 5 tons and up1.90239 modelsNon-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsNon-ducted, 3.5–4.5 tons1.97438 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 typeBoschCOSTWAY
Ducted, up to 1.5 tons11 · index 65%None
Ducted, 2 tons9 · index 72%None
Ducted, 2.5–3 tons12 · index 58%None
Ducted, 3.5–4.5 tons7 · index 68%None
Ducted, 5 tons and up5 · index 60%None
Non-ducted, up to 1.5 tons11 · index 68%1 · index 44%
Non-ducted, 2 tons2 · index 81%1 · index 49%
Non-ducted, 2.5–3 tons10 · index 61%1 · index 51%
Non-ducted, 3.5–4.5 tons4 · index 58%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 typeBoschCold-climate score, best modelCOSTWAYCold-climate score, best model
Ducted, up to 1.5 tons75.2(50 is the typical model of its size class)BMS500-AAS009-1CSXHBwith ducted air handler BMS500-AAU009-1AHDXB10 of 11 models qualify · AHRI 204014467No models in this size class
Ducted, 2 tons82.3(50 is the typical model of its size class)BMS500-AAS024-1CSXHBwith ducted air handler BMS500-AAU024-1AHDXB8 of 8 models qualify · AHRI 204014470No models in this size class
Ducted, 2.5–3 tons89.0(50 is the typical model of its size class)BOVD-36HDN1-M20Gwith indoor coil D(A,C,E)36C44+TDR and furnace BGH96M100C5B5 of 12 models qualify · AHRI 215375438No models in this size class
Ducted, 3.5–4.5 tons88.1(50 is the typical model of its size class)BOVA-60HDN1-M20Gwith ducted air handler L(E,G)M48G45 of 8 models qualify · AHRI 212675690No models in this size class
Ducted, 5 tons and up70.2(50 is the typical model of its size class)BRB-60HWD1N1-M19Also listed as BRBA-60HWD1N1-M182 of 5 models qualify · AHRI 202680590No models in this size class
Non-ducted, up to 1.5 tons89.3(50 is the typical model of its size class) (higher)BMS500-AAS009-1CSXRCwith ductless indoor unit BMS500-AAU006-1AHWXC7 of 11 models qualify · AHRI 20775999336.0(50 is the typical model of its size class)FP10794US-WH1 of 1 models qualify · AHRI 215439580
Non-ducted, 2 tons86.1(50 is the typical model of its size class)BMS500-AAS024-1CSXHCwith ductless indoor unit BMS500-AAU024-1AHCXC2 of 2 models qualify · AHRI 207760018None on this board (0 of 1 models qualify)
Non-ducted, 2.5–3 tons79.3(50 is the typical model of its size class)BMS500-AAM036-1CSXHC3 of 10 models qualify · AHRI 207760039None on this board (0 of 1 models qualify)
Non-ducted, 3.5–4.5 tons76.2(50 is the typical model of its size class)BMS500-AAM048-1CSXHC1 of 4 models qualify · AHRI 207760042No 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 typeBoschAll-around score, best modelCOSTWAYAll-around score, best model
Ducted, up to 1.5 tons85.2(50 is the typical model of its size class)BMS500-AAS009-1CSXHCwith ducted air handler BMS500-AAU009-1AHDXB11 of 11 models have all five ratings · AHRI 207760001No models in this size class
Ducted, 2 tons87.9(50 is the typical model of its size class)BOVA-36HDN1-M20Gwith ducted air handler AE(D,N,U)+CM36B34+TDR9 of 9 models have all five ratings · AHRI 213885831No models in this size class
Ducted, 2.5–3 tons85.5(50 is the typical model of its size class)BOVD-36HDN1-M20Gwith indoor coil D(A,C,E)36C44+TDR and furnace BGH96M100C5B11 of 12 models have all five ratings · AHRI 215375438No models in this size class
Ducted, 3.5–4.5 tons88.4(50 is the typical model of its size class)BOVA-60HDN1-M20Gwith ducted air handler L(E,G)M48G46 of 7 models have all five ratings · AHRI 212675690No models in this size class
Ducted, 5 tons and up75.1(50 is the typical model of its size class)BRB-60HWD1N1-M19Also listed as BRBA-60HWD1N1-M185 of 5 models have all five ratings · AHRI 202680590No models in this size class
Non-ducted, up to 1.5 tons92.0(50 is the typical model of its size class) (higher)BMS500-AAS009-1CSXRCwith ductless indoor unit BMS500-AAU006-1AHWXC11 of 11 models have all five ratings · AHRI 20775999343.5(50 is the typical model of its size class)FP10794US-WH1 of 1 models have all five ratings · AHRI 215439580
Non-ducted, 2 tons84.3(50 is the typical model of its size class) (higher)BMS500-AAS024-1CSXHCwith ductless indoor unit BMS500-AAU024-1AHWXC2 of 2 models have all five ratings · AHRI 20775999749.4(50 is the typical model of its size class)FP10795US-WH1 of 1 models have all five ratings · AHRI 215439581
Non-ducted, 2.5–3 tons82.8(50 is the typical model of its size class) (higher)BMS500-AAM036-1CSXHC8 of 10 models have all five ratings · AHRI 20776003951.2(50 is the typical model of its size class)FP10796US-WH1 of 1 models have all five ratings · AHRI 215439582
Non-ducted, 3.5–4.5 tons77.9(50 is the typical model of its size class)BMS500-AAM048-1CSXHC3 of 4 models have all five ratings · AHRI 207760042No 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
RatingBoschCOSTWAY
COP at 5°Fbeats 99% · 3.03BOVD-36HDN1-M20GDucted, 2.5–3 tonsbeats 26% · 1.80FP10795US-WHNon-ducted, 2 tons
Capacity retention at 5°Fbeats 100% · 126%BOVD-36HDN1-M20GDucted, 2.5–3 tonsbeats 44% · 70%FP10794US-WHNon-ducted, up to 1.5 tons
HSPF2beats 98% · 13.6BMS500-AAS009-1CSXRCNon-ducted, up to 1.5 tonsbeats 48% · 9.0FP10795US-WHNon-ducted, 2 tons
SEER2beats 99% · 24.6BMS500-AAM027-1CSXRCNon-ducted, 2.5–3 tonsbeats 85% · 22.0FP10795US-WHNon-ducted, 2 tons
EER2beats 98% · 16.2BMS500-AAS009-1CSXHCNon-ducted, up to 1.5 tonsbeats 67% · 12.0FP10796US-WHNon-ducted, 2.5–3 tons
Heating capacity at 5°Fbeats 96% · 20,000 Btu/hBMS500-AAM018-1CSXHCNon-ducted, up to 1.5 tonsbeats 84% · 13,800 Btu/hFP10794US-WHNon-ducted, up to 1.5 tons

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