ACC heat pump efficiency: 4 outdoor models compared

ACC has 4 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 ACC makes. ACC 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: 4
AHRI certifications: 5
Efficiency index: 55%; Typical model vs same-size, same-type peers (1 model)
Meet CEE 2025: 0%; 0 models

How ACC 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.

ACC against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of ACC’s own modelsACC is strongest on heating capacity at 5°F (its typical model beats 79% of comparable models) and weakest on EER2 (12%).

ACC
Middle half of its models
Other ranked manufacturers

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

Average peer percentile of ACC’s models
Rating	Beats comparable models	Rank	Raw median
Efficiency index1 model scored	55%	Not ranked	—
COP at 5°F1 model scored	67%	Not ranked	2.08
Capacity retention at 5°F1 model scored	77%	Not ranked	59%
HSPF24 models scored	55%	Not ranked	8.6
SEER24 models scored	32%	Not ranked	15.3
EER24 models scored	12%	Not ranked	8.6
Heating capacity at 5°F1 model scored	79%	Not ranked	35,600 Btu/h

Standards met

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

Sizes and duct types offered

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

ACC’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

ACC (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
Ducted, 2.5–3 tons	1	—	—	64%	28%
Ducted, 3.5–4.5 tons	1	—	—	81%	38%
Ducted, 5 tons and up	1	55%	67%	70%	58%
Non-ducted, 2.5–3 tons	1	—	—	5%	5%

Every ACC model in the market

ACC’s 4 models with a known size and duct type, over the shape of the whole catalog.

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

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

Dots: 4 acc 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 ACC 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

No ACC model keeps at least 70% of its heat at 5°F with all three cold-climate ratings.

All-around best

Top 1 ACC 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
1MSH603E18MCAAACCwith ducted air handler MST363E18ADAA	5 tons57,000 Btu/h · Ducted	59%	2.08	8.4	15.4	9.0	None	2	203991110	Ducted, 5 tons and up	54.5	71.3	37.7	Not a pick

Best model on each rating

ACC’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	MSH603E18MCAA	2.08	Ducted, 5 tons and up	67%	203991110
Capacity retention at 5°F	MSH603E18MCAA	59%	Ducted, 5 tons and up	73%	203991110
HSPF2	MSH483E18MCAA	9.3	Ducted, 3.5–4.5 tons	80%	203991109
SEER2	MSH603E18MCAA	15.4	Ducted, 5 tons and up	54%	203991110
EER2	MSH603E18MCAA	9.0	Ducted, 5 tons and up	16%	203991110
Heating capacity at 5°F	MSH603E18MCAA	35,600 Btu/h	Ducted, 5 tons and up	78%	203991110

All 4 ACC models in Explore

ACC 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.

ACC: 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
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)
Ducted, 3.5–4.5 tons	None on this board (0 of 1 models qualify)	None on this board (0 of 1 models have all five ratings)
Ducted, 5 tons and up	None on this board (0 of 1 models qualify)	54.5(50 is the typical model of its size class)MSH603E18MCAAwith ducted air handler MST363E18ADAA1 of 1 models have all five ratings · AHRI 203991110
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 ACC certifications

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

The 4 most recently certified ACC outdoor models
Outdoor model	Size · type	COP@5°F	Cap. 5/47	HSPF2	SEER2	Meets	Combos	AHRI ref.
MSH603E18MCAAACCwith ducted air handler MST603E18ADAA	5 tons57,000 Btu/h · Ducted	2.08	59%	8.4	15.4	None	2	206199281
MSH483E18MCAAACCwith ducted air handler MST483E18ADAA	4 tons48,000 Btu/h · Ducted	—	—	9.3	15.1	None	1	203991109
MSH363E18MCAAACCwith ducted air handler MST363E18ADAA	3 tons36,000 Btu/h · Ducted	—	—	8.8	15.0	None	1	203991108
MSH363E23MCAAACCwith ductless indoor unit MSH363E23AXAA	3 tons36,000 Btu/h · Non-ducted	—	—	7.5	16.0	None	1	203991107

Shares hardware with

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

No shared hardware found for ACC in this group.

Compare ACC

Manufacturers of a similar size, side by side.

Compare with any manufacturer

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