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 iCongo 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 6 of the 6 ratings.

Bosch
iCongo
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 9, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Bosch	iCongo
Efficiency index	62% (higher)median — · 3rd ranked	42% (higher)median —
COP at 5°F	63% (higher)median 2.10 · 5th ranked	37% (higher)median 1.82
Capacity retention at 5°F	62% (higher)median 75% · 4th ranked	52% (higher)median 68%
HSPF2	68% (higher)median 9.5 · 4th ranked	49% (higher)median 8.4
SEER2	65% (higher)median 19.0 · 3rd ranked	48% (higher)median 15.8
EER2	55% (higher)median 11.7 · 12th ranked	28% (higher)median 10.0
Heating capacity at 5°F	65% (higher)median 23,000 Btu/h · 4th ranked	55% (higher)median 25,200 Btu/h
Outdoor models	47	47
AHRI certifications	1,789	97

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Bosch	iCongo
CEE 2025 Tier 1 (Split ASHP)	93.6%44 models	31.9%15 models
CEE 2026 Tier 1 (Split ASHP)	91.5%43 models	31.9%15 models
CEE Advanced Tier (Split ASHP)	14.9%7 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	83%39 models	31.9%15 models
DOE Cold Climate Heat Pump Challenge	14.9%7 models	0%0 models
ENERGY STAR Cold Climate	85.1%40 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 · 4 groups where both have models

Bosch
iCongo
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 9, 2026

Models per peer group · efficiency index within the group
Size and duct type	Bosch	iCongo
Ducted, up to 1.5 tons	10 · index 70%	3 · index 35%
Ducted, 2 tons	7 · index 65%	10 · index 43%
Ducted, 2.5–3 tons	12 · index 55%	12 · index 37%
Ducted, 3.5–4.5 tons	11 · index 68%	22 · index 46%
Ducted, 5 tons and up	4 · index 63%	None
Non-ducted, up to 1.5 tons	9 · index 71%	None
Non-ducted, 2 tons	3 · index 64%	None
Non-ducted, 2.5–3 tons	10 · index 51%	None
Non-ducted, 3.5–4.5 tons	3 · index 60%	None
Non-ducted, 5 tons and up	2 · index 35%	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 type	BoschCold-climate score, best model	iCongoCold-climate score, best model
Ducted, up to 1.5 tons	80.1(50 is the typical model of its size class) (higher)BMS500-AAS009-1CSXRDwith ducted air handler BMS500-AAU009-1AHDXD10 of 10 models qualify · AHRI 215223297	45.5(50 is the typical model of its size class)ZOC-18HIN4-M-SE18with ducted air handler ZVMQFA-18HIN4L-M-SE152 of 3 models qualify · AHRI 217902692
Ducted, 2 tons	85.7(50 is the typical model of its size class) (higher)BMS500-AAS024-1CSXHDwith ducted air handler BMS500-AAU024-1AHDXD8 of 8 models qualify · AHRI 215223291	70.4(50 is the typical model of its size class)ZWDA-24HI1N4-M-SE18Also listed as ZWDA-24HI1N4-M-SE189 of 10 models qualify · AHRI 217022533
Ducted, 2.5–3 tons	83.7(50 is the typical model of its size class) (higher)BOVB-36MTB-M19Ewith ducted air handler BIVB-36MCB-M19X8 of 12 models qualify · AHRI 217903121	69.2(50 is the typical model of its size class)ZOD-36HIN4-M-SE18Hwith ducted air handler ZVMXFB-36HI1N4-C-M-SE183 of 12 models qualify · AHRI 218647967
Ducted, 3.5–4.5 tons	90.9(50 is the typical model of its size class) (higher)BOVA-60MTB-M19Ewith ducted air handler AE*L+DM60B4Z+TXV+TDR10 of 10 models qualify · AHRI 218693518	66.2(50 is the typical model of its size class)ZODA-48HIN4-M-SE18H*with ducted air handler ZVMXFC-48HI1N4-C-M-SE1811 of 22 models qualify · AHRI 218673039
Ducted, 5 tons and up	63.4(50 is the typical model of its size class)BPBA-60RCB-M18SAlso listed as BPBB-60RTB-M18S3 of 4 models qualify · AHRI 216011943	No models in this size class
Non-ducted, up to 1.5 tons	97.5(50 is the typical model of its size class)BMS500-AAS009-1CSXRDwith ductless indoor unit BMS500-AAU006-1AHWXD8 of 9 models qualify · AHRI 217656832	No models in this size class
Non-ducted, 2 tons	89.4(50 is the typical model of its size class)BMS500-AAS024-1CSXHDwith ductless indoor unit BMS500-AAU024-1AHCXD3 of 3 models qualify · AHRI 215223292	No models in this size class
Non-ducted, 2.5–3 tons	78.0(50 is the typical model of its size class)BMS500-AAM036-1CSXHD8 of 10 models qualify · AHRI 215223324	No models in this size class
Non-ducted, 3.5–4.5 tons	73.4(50 is the typical model of its size class)BMS500-AAM048-1CSXHD3 of 3 models qualify · AHRI 215223327	No models in this size class
Non-ducted, 5 tons and up	50.6(50 is the typical model of its size class)BOHA-60MTB-M18S2 of 2 models qualify · AHRI 218059677	No 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 type	BoschAll-around score, best model	iCongoAll-around score, best model
Ducted, up to 1.5 tons	86.7(50 is the typical model of its size class) (higher)BMS500-AAS009-1CSXHDwith ducted air handler BMS500-AAU009-1AHDXD10 of 10 models have all five ratings · AHRI 215223281	38.9(50 is the typical model of its size class)ZOC-18HIN4-M-SE18with ducted air handler ZVMXFA-18HI1N4-C-M-SE183 of 3 models have all five ratings · AHRI 217022537
Ducted, 2 tons	85.6(50 is the typical model of its size class) (higher)BOVA-36RTB-M20Swith ducted air handler L(E,G)M36FJ9 of 9 models have all five ratings · AHRI 217887951	76.9(50 is the typical model of its size class)ZOT6P-24HIN4-M-SE20with ducted air handler ZVMXFB-24HI1N4-M-SE2010 of 10 models have all five ratings · AHRI 217902688
Ducted, 2.5–3 tons	83.6(50 is the typical model of its size class) (higher)BMS500-AAM036-1CSXHD10 of 10 models have all five ratings · AHRI 215223323	54.1(50 is the typical model of its size class)ZOT6P-36HIN4-M-SE20with ducted air handler ZVMXFB-36HI1N4-M-SE2012 of 12 models have all five ratings · AHRI 217902689
Ducted, 3.5–4.5 tons	86.3(50 is the typical model of its size class) (higher)BOVA-60MTB-M19Ewith ducted air handler (V,R)60H210P19*+TXV+AEFE511 of 11 models have all five ratings · AHRI 218796938	65.5(50 is the typical model of its size class)ZWDA-48HI1N4-M-SE18Also listed as ZWDB-48HI1N4S4-M-SE1822 of 22 models have all five ratings · AHRI 217022535
Ducted, 5 tons and up	70.1(50 is the typical model of its size class)BPBA-60RCB-M18SAlso listed as BPBB-60RTB-M18S4 of 4 models have all five ratings · AHRI 216011943	No models in this size class
Non-ducted, up to 1.5 tons	95.8(50 is the typical model of its size class)BMS500-AAS009-1CSXRDwith ductless indoor unit BMS500-AAU006-1AHWXD9 of 9 models have all five ratings · AHRI 217656832	No models in this size class
Non-ducted, 2 tons	86.8(50 is the typical model of its size class)BMS500-AAS024-1CSXRDwith ductless indoor unit BMS500-AAU024-1AHWXD3 of 3 models have all five ratings · AHRI 215223306	No models in this size class
Non-ducted, 2.5–3 tons	78.3(50 is the typical model of its size class)BMS500-AAM036-1CSXHD10 of 10 models have all five ratings · AHRI 215223322	No models in this size class
Non-ducted, 3.5–4.5 tons	75.6(50 is the typical model of its size class)BMS500-AAM048-1CSXHD3 of 3 models have all five ratings · AHRI 215223325	No models in this size class
Non-ducted, 5 tons and up	36.0(50 is the typical model of its size class)BOHA-60MTB-M18S2 of 2 models have all five ratings · AHRI 218059677	No 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
Rating	Bosch	iCongo
COP at 5°F	beats 99% · 2.73BOHA-24MTB-M18SDucted, up to 1.5 tons	beats 99% · 2.80ZOT6PA-42HN4-M-SE14.3Ducted, 3.5–4.5 tons
Capacity retention at 5°F	beats 100% · 127%BOVA-60MTB-M19EDucted, 3.5–4.5 tons	beats 99% · 115%ZOD-36HIN4-M-SE18HDucted, 2.5–3 tons
HSPF2	beats 99% · 11.0BMS500-AAM048-1CSXHDDucted, 3.5–4.5 tons	beats 87% · 10.1ZOD-36HIN4-M-SE18HDucted, 2.5–3 tons
SEER2	beats 97% · 25.0BMS500-AAM027-1CSXRDNon-ducted, 2.5–3 tons	beats 86% · 19.3ZOT6P-36HIN4-M-SE20Ducted, 2.5–3 tons
EER2	beats 100% · 18.1BMS500-AAS009-1CSXRDNon-ducted, up to 1.5 tons	beats 81% · 12.5ZOT6P-24HIN4-M-SE20Ducted, 2 tons
Heating capacity at 5°F	beats 100% · 64,000 Btu/hBOVA-60MTB-M19EDucted, 3.5–4.5 tons	beats 100% · 42,500 Btu/hZOD-36HIN4-M-SE18HDucted, 2.5–3 tons

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Bosch vs iCongo heat pumps