Buck Cool heat pump efficiency: 5 outdoor models compared

Buck Cool has 5 heat pump outdoor models certified with this refrigerant group, in 5 AHRI-certified combinations. Each model is compared with models of the same size and duct type, so the scores below do not depend on which sizes Buck Cool makes. Buck Cool has no QMID (IRS Qualified Manufacturer ID) on file, so it is not ranked against other manufacturers.

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ManufacturerData as of Oct 11, 2026updated Oct 11, 2026 · sources

Outdoor models: 5
AHRI certifications: 5
Efficiency index: 55%; Typical model vs same-size, same-type peers (4 models)
Meet CEE 2025: 80%; 4 models

How Buck Cool compares with comparable models

For each rating: the share of same-size, same-type models that a typical model of this manufacturer beats (50% is typical), its rank, and the raw median for context. Raw medians are not comparable across manufacturers that make different sizes.

Buck Cool against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of Buck Cool’s own modelsBuck Cool is strongest on capacity retention at 5°F (its typical model beats 70% of comparable models) and weakest on HSPF2 (33%).

Buck Cool
Middle half of its models
Other ranked manufacturers

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

Average peer percentile of Buck Cool’s models
Rating	Beats comparable models	Rank	Raw median
Efficiency index4 models scored	55%	Not ranked	—
COP at 5°F4 models scored	60%	Not ranked	1.98
Capacity retention at 5°F4 models scored	70%	Not ranked	81%
HSPF25 models scored	33%	Not ranked	8.6
SEER25 models scored	43%	Not ranked	20.5
EER25 models scored	48%	Not ranked	12.5
Heating capacity at 5°F4 models scored	55%	Not ranked	11,715 Btu/h

Standards met

Share of Buck Cool’s models with at least one qualifying certification
Standard	Share	Models
CEE 2025 Tier 1 (Split ASHP)	80%	4
CEE 2026 Tier 1 (Split ASHP)	80%	4
CEE Advanced Tier (Split ASHP)	0%	0
Xcel Energy Colorado cold-climate ASHP (2025)	80%	4
DOE Cold Climate Heat Pump Challenge	0%	0
ENERGY STAR Cold Climate	60%	3

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.

Buck Cool’s models inside each size and duct typeShape: every model of the group · blue: the middle half of this manufacturer’s models there, median dot, 10th–90th percentile line

Buck Cool (median, middle 50%, 10th–90th)
All models of the group

Source: AHRI Directory · as of Oct 11, 2026

Share of comparable models beaten, per peer group
Size and duct type	Models	Index	COP@5°F	HSPF2	SEER2
Non-ducted, up to 1.5 tons	3	54%	53%	41%	48%
Non-ducted, 2 tons	1	59%	81%	37%	58%
Non-ducted, 2.5–3 tons	1	—	—	5%	11%

Every Buck Cool model in the market

Buck Cool’s 5 models with a known size and duct type, over the shape of the whole catalog.

Buck Cool models by size and ratingColoured: Buck Cool · grey shapes: all 11,475 models · lines: catalog medians by size

Buck Cool models
Ducted median by size
Non-ducted median by size
Every model at each size (width = count)
Standard threshold

Dots: 5 buck cool models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 11,475 models, half a ton at a time.

Show the data as a table

COP at 5°F by size and duct type (every model, by rated cooling capacity)
Duct type, size	Models	10th pct.	25th	Median	75th	90th
Ducted, 0.5 tons	175	1.70	1.85	1.90	2.10	2.26
Ducted, 1 ton	340	1.85	1.90	2.00	2.40	2.65
Ducted, 1.5 tons	789	1.75	1.85	2.00	2.20	2.55
Ducted, 2 tons	782	1.73	1.80	2.00	2.10	2.33
Ducted, 2.5 tons	735	1.71	1.80	1.90	2.09	2.48
Ducted, 3 tons	652	1.68	1.70	1.90	2.06	2.36
Ducted, 3.5 tons	641	1.61	1.80	1.95	2.20	2.50
Ducted, 4 tons	367	1.70	1.80	1.91	2.02	2.52
Ducted, 4.5 tons	544	1.70	1.80	1.91	2.08	2.34
Ducted, 5 tons	25	1.80	1.80	1.90	1.90	2.15
Non-ducted, 0.5 tons	717	1.75	1.81	1.97	2.10	2.19
Non-ducted, 1 ton	1,064	1.75	1.80	1.90	2.07	2.25
Non-ducted, 1.5 tons	886	1.80	1.80	1.87	2.07	2.21
Non-ducted, 2 tons	564	1.80	1.80	1.83	2.04	2.21
Non-ducted, 2.5 tons	275	1.80	1.81	1.84	1.86	2.03
Non-ducted, 3 tons	502	1.80	1.80	1.90	2.00	2.09
Non-ducted, 3.5 tons	70	1.82	1.83	1.90	2.00	2.28
Non-ducted, 4 tons	263	1.80	1.80	1.98	2.00	2.10
Non-ducted, 4.5 tons	103	1.77	1.77	1.80	1.97	2.02
Non-ducted, 5 tons	29	1.98	2.00	2.10	2.30	2.47

Source: AHRI Directory · as of Oct 11, 2026

Top Buck Cool models

Its top five cold-climate picks and its top five all-around models across sizes (both scores compare each model with models of its own size and duct type, so sizes compare), then, on each single rating, the model that beats the largest share of comparable models.

Cold-climate picks

Top 4 Buck Cool cold-climate picks across sizes. 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.
# · Outdoor model	Size · type	Cap. 5/47	COP@5°F	HSPF2	Btu/h @5°F	SEER2	Meets	Combos	AHRI ref.	Compared with	Score
1UB1MSHQCO24Buck Cool · Hi MULTI Xtremewith ductless indoor unit UB1MSHQCW24	2 tons23,000 Btu/h · Non-ducted	89%	2.13	8.6	20,500	20.5	CEE 25CEE 26XcelES CC	1	208287576	Non-ducted, 2 tons	64.0
2UB1MSHQCO09Buck Cool · Hi MULTI Xtremewith ductless indoor unit UB1MSHQCW09	1 ton9,000 Btu/h · Non-ducted	81%	2.09	9.0	7,280	18.5	CEE 25CEE 26XcelES CC	1	208287570	Non-ducted, up to 1.5 tons	62.1
3UB1MSHQCO12Buck Cool · HiULTRAwith ductless indoor unit UB1MSHQCW12	1 ton12,000 Btu/h · Non-ducted	81%	1.86	9.5	9,660	21.7	CEE 25CEE 26Xcel	1	208287572	Non-ducted, up to 1.5 tons	55.9
4UB1MSHQCO18Buck Cool · Hi MULTI Xtremewith ductless indoor unit UB1MSHQCW18	1.5 tons18,000 Btu/h · Non-ducted	77%	1.87	8.6	13,770	22.5	CEE 25CEE 26XcelES CC	1	208287574	Non-ducted, up to 1.5 tons	43.2

All-around best

Top 4 Buck Cool models on the all-around score across sizes. 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.
# · Outdoor model	Size · type	Cap. 5/47	COP@5°F	HSPF2	SEER2	EER2	Meets	Combos	AHRI ref.	Compared with	Score	Heating half	Cooling half	Cold-climate score
1UB1MSHQCO24Buck Cool · Hi MULTI Xtremewith ductless indoor unit UB1MSHQCW24	2 tons23,000 Btu/h · Non-ducted	89%	2.13	8.6	20.5	12.2	CEE 25CEE 26XcelES CC	1	208287576	Non-ducted, 2 tons	58.5	64.0	53.1	64.0
2UB1MSHQCO18Buck Cool · Hi MULTI Xtremewith ductless indoor unit UB1MSHQCW18	1.5 tons18,000 Btu/h · Non-ducted	77%	1.87	8.6	22.5	13.0	CEE 25CEE 26XcelES CC	1	208287574	Non-ducted, up to 1.5 tons	56.5	43.2	69.8	43.2
3UB1MSHQCO12Buck Cool · HiULTRAwith ductless indoor unit UB1MSHQCW12	1 ton12,000 Btu/h · Non-ducted	81%	1.86	9.5	21.7	12.5	CEE 25CEE 26Xcel	1	208287572	Non-ducted, up to 1.5 tons	55.0	55.9	54.1	55.9
4UB1MSHQCO09Buck Cool · Hi MULTI Xtremewith ductless indoor unit UB1MSHQCW09	1 ton9,000 Btu/h · Non-ducted	81%	2.09	9.0	18.5	12.8	CEE 25CEE 26XcelES CC	1	208287570	Non-ducted, up to 1.5 tons	51.2	62.1	40.3	62.1

Best model on each rating

Buck Cool’s model with the highest peer percentile on each rating, ranked by that one rating only
Rating	Model	Value	Compared with	Beats	AHRI ref.
COP at 5°F	UB1MSHQCO24	2.13	Non-ducted, 2 tons	81%	208287576
Capacity retention at 5°F	UB1MSHQCO24	89%	Non-ducted, 2 tons	69%	208287576
HSPF2	UB1MSHQCO12	9.5	Non-ducted, up to 1.5 tons	57%	208287572
SEER2	UB1MSHQCO18	22.5	Non-ducted, up to 1.5 tons	67%	208287574
EER2	UB1MSHQCO18	13.0	Non-ducted, up to 1.5 tons	68%	208287574
Heating capacity at 5°F	UB1MSHQCO18	13,770 Btu/h	Non-ducted, up to 1.5 tons	83%	208287574

All 5 Buck Cool models in Explore

Buck Cool size class by size class: cold-climate and all-around

Its best model on each board in every size and duct type it makes. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there). Cold-climate picks must keep at least 70% of their heat at 5°F; the all-around score needs all five ratings and has no such bar.

Buck Cool: best cold-climate pick and best all-around model per size and duct type, with how many of its models are on each board (top 5 and 5 per class are in the snapshot)
Size and duct type	Cold-climate pickCold-climate score, best model	All-around bestAll-around score, best model
Non-ducted, up to 1.5 tons	62.1(50 is the typical model of its size class)UB1MSHQCO09with ductless indoor unit UB1MSHQCW093 of 3 models qualify · AHRI 208287570	56.5(50 is the typical model of its size class)UB1MSHQCO18with ductless indoor unit UB1MSHQCW183 of 3 models have all five ratings · AHRI 208287574
Non-ducted, 2 tons	64.0(50 is the typical model of its size class)UB1MSHQCO24with ductless indoor unit UB1MSHQCW241 of 1 models qualify · AHRI 208287576	58.5(50 is the typical model of its size class)UB1MSHQCO24with ductless indoor unit UB1MSHQCW241 of 1 models have all five ratings · AHRI 208287576
Non-ducted, 2.5–3 tons	None on this board (0 of 1 models qualify)	None on this board (0 of 1 models have all five ratings)

All-around board, every manufacturer

Newest Buck Cool certifications

By AHRI reference number; AHRI issues references in increasing order.

The 5 most recently certified Buck Cool outdoor models
Outdoor model	Size · type	COP@5°F	Cap. 5/47	HSPF2	SEER2	Meets	Combos	AHRI ref.
UB1MSHQCO36Buck Coolwith ductless indoor unit UB1MSHQCW36	3 tons35,000 Btu/h · Non-ducted	—	—	7.5	16.5	None	1	208287621
UB1MSHQCO24Buck Cool · Hi MULTI Xtremewith ductless indoor unit UB1MSHQCW24	2 tons23,000 Btu/h · Non-ducted	2.13	89%	8.6	20.5	CEE 25CEE 26XcelES CC	1	208287576
UB1MSHQCO18Buck Cool · Hi MULTI Xtremewith ductless indoor unit UB1MSHQCW18	1.5 tons18,000 Btu/h · Non-ducted	1.87	77%	8.6	22.5	CEE 25CEE 26XcelES CC	1	208287574
UB1MSHQCO12Buck Cool · HiULTRAwith ductless indoor unit UB1MSHQCW12	1 ton12,000 Btu/h · Non-ducted	1.86	81%	9.5	21.7	CEE 25CEE 26Xcel	1	208287572
UB1MSHQCO09Buck Cool · Hi MULTI Xtremewith ductless indoor unit UB1MSHQCW09	1 ton9,000 Btu/h · Non-ducted	2.09	81%	9.0	18.5	CEE 25CEE 26XcelES CC	1	208287570

Shares hardware with

Manufacturers whose models are the same equipment under another badge. About OEM families

No shared hardware found for Buck Cool in this group.

Compare Buck Cool

Manufacturers of a similar size, side by side.

Compare with any manufacturer

Buck Cool includes these brand names as listed in AHRI: Buck Cool. Standards are checked against published thresholds; program rules beyond ratings are not checked.