Brothers vs SUNCHILLERS heat pumps

Measured against models of the same size and duct type, SUNCHILLERS scores higher on 3 of the 6 ratings. Brothers has 8 outdoor models, SUNCHILLERS has 8 outdoor models. Brothers and SUNCHILLERS have no QMID on file and are not ranked.

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CompareData as of Oct 11, 2026updated Oct 11, 2026 · 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 SUNCHILLERS 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, SUNCHILLERS scores higher on 3 of the 6 ratings.

Brothers
SUNCHILLERS
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Brothers	SUNCHILLERS
Efficiency index	—median —	68%median —
COP at 5°F	—median —	50%median 2.00
Capacity retention at 5°F	—median —	45%median 68%
HSPF2	24%median 7.5	74%median 10.1
SEER2	17%median 14.3	88%median 23.7
EER2	56%median 11.6	71%median 12.6
Heating capacity at 5°F	—median —	45%median 19,500 Btu/h
Outdoor models	8	8
AHRI certifications	25	20

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Brothers	SUNCHILLERS
CEE 2025 Tier 1 (Split ASHP)	0%0 models	100%8 models
CEE 2026 Tier 1 (Split ASHP)	0%0 models	87.5%7 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	0%0 models	50%4 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	0%0 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 · 3 groups where both have models

Brothers
SUNCHILLERS
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	Brothers	SUNCHILLERS
Ducted, up to 1.5 tons	2 · index —	2 · index 61%
Ducted, 2 tons	2 · index —	1 · index 84%
Ducted, 2.5–3 tons	4 · index —	3 · index 63%
Ducted, 3.5–4.5 tons	None	1 · index 64%
Non-ducted, up to 1.5 tons	None	3 · index 78%
Non-ducted, 2 tons	None	1 · index 78%
Non-ducted, 2.5–3 tons	None	3 · index 64%
Non-ducted, 3.5–4.5 tons	None	1 · index 56%

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	BrothersCold-climate score, best model	SUNCHILLERSCold-climate score, best model
Ducted, up to 1.5 tons	None on this board (0 of 2 models qualify)	67.8(50 is the typical model of its size class)12WODU-ULwith ducted air handler 12DIDU-UL2 of 2 models qualify · AHRI 208447612
Ducted, 2 tons	None on this board (0 of 2 models qualify)	80.3(50 is the typical model of its size class)24WODU-ULwith ducted air handler 24DIDU-UL1 of 1 models qualify · AHRI 208447613
Ducted, 2.5–3 tons	None on this board (0 of 4 models qualify)	None on this board (0 of 3 models qualify)
Ducted, 3.5–4.5 tons	No models in this size class	None on this board (0 of 1 models qualify)
Non-ducted, up to 1.5 tons	No models in this size class	86.0(50 is the typical model of its size class)9WODU-ULwith ductless indoor unit 9WIDU-UL2 of 3 models qualify · AHRI 208447609
Non-ducted, 2 tons	No models in this size class	60.4(50 is the typical model of its size class)24WODU-ULwith ductless indoor unit 24WIDU-UL1 of 1 models qualify · AHRI 208447611
Non-ducted, 2.5–3 tons	No models in this size class	None on this board (0 of 3 models qualify)
Non-ducted, 3.5–4.5 tons	No models in this size class	None on this board (0 of 1 models qualify)

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	BrothersAll-around score, best model	SUNCHILLERSAll-around score, best model
Ducted, up to 1.5 tons	None on this board (0 of 2 models have all five ratings)	61.5(50 is the typical model of its size class)12WODU-ULwith ducted air handler 12DIDU-UL2 of 2 models have all five ratings · AHRI 208447612
Ducted, 2 tons	None on this board (0 of 2 models have all five ratings)	83.8(50 is the typical model of its size class)24WODU-ULwith ducted air handler 24DIDU-UL1 of 1 models have all five ratings · AHRI 208447613
Ducted, 2.5–3 tons	None on this board (0 of 4 models have all five ratings)	75.4(50 is the typical model of its size class)M27ODU-UL2P3 of 3 models have all five ratings · AHRI 207804190
Ducted, 3.5–4.5 tons	No models in this size class	63.5(50 is the typical model of its size class)M48ODU-UL2P1 of 1 models have all five ratings · AHRI 207804196
Non-ducted, up to 1.5 tons	No models in this size class	88.4(50 is the typical model of its size class)9WODU-ULwith ductless indoor unit 9WIDU-UL3 of 3 models have all five ratings · AHRI 208447609
Non-ducted, 2 tons	No models in this size class	77.5(50 is the typical model of its size class)24WODU-ULwith ductless indoor unit 24WIDU-UL1 of 1 models have all five ratings · AHRI 208447611
Non-ducted, 2.5–3 tons	No models in this size class	78.2(50 is the typical model of its size class)M27ODU-UL2P3 of 3 models have all five ratings · AHRI 207804189
Non-ducted, 3.5–4.5 tons	No models in this size class	56.1(50 is the typical model of its size class)M48ODU-UL2P1 of 1 models have all five ratings · AHRI 207804195

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	Brothers	SUNCHILLERS
COP at 5°F	—	beats 97% · 2.3912WODU-ULNon-ducted, up to 1.5 tons
Capacity retention at 5°F	—	beats 71% · 86%9WODU-ULNon-ducted, up to 1.5 tons
HSPF2	beats 27% · 7.8BRO-24HN5Ducted, 2 tons	beats 98% · 11.224WODU-ULDucted, 2 tons
SEER2	beats 24% · 15.2BRO-24HN5Ducted, 2 tons	beats 99% · 24.6M27ODU-UL2PNon-ducted, 2.5–3 tons
EER2	beats 67% · 11.7BRO-30HN5Ducted, 2.5–3 tons	beats 97% · 14.024WODU-ULNon-ducted, 2 tons
Heating capacity at 5°F	—	beats 85% · 14,000 Btu/hM18ODU-UL2PNon-ducted, up to 1.5 tons

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