STEALTH heat pump efficiency: 11 outdoor models compared

STEALTH has 11 heat pump outdoor models certified with this refrigerant group, in 11 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 STEALTH makes. STEALTH 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 9, 2026updated Oct 10, 2026 · sources

Outdoor models: 11
AHRI certifications: 11
Efficiency index: 54%; Typical model vs same-size, same-type peers (11 models)
Meet CEE 2025: 72.7%; 8 models

How STEALTH 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.

STEALTH against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of STEALTH’s own modelsSTEALTH is strongest on heating capacity at 5°F (its typical model beats 62% of comparable models) and weakest on EER2 (39%).

STEALTH
Middle half of its models
Other ranked manufacturers

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

Average peer percentile of STEALTH’s models
Rating	Beats comparable models	Rank	Raw median
Efficiency index11 models scored	54%	Not ranked	—
COP at 5°F11 models scored	53%	Not ranked	2.00
Capacity retention at 5°F11 models scored	59%	Not ranked	78%
HSPF211 models scored	59%	Not ranked	9.0
SEER211 models scored	62%	Not ranked	18.0
EER211 models scored	39%	Not ranked	11.3
Heating capacity at 5°F11 models scored	62%	Not ranked	24,600 Btu/h

Standards met

Share of STEALTH’s models with at least one qualifying certification
Standard	Share	Models
CEE 2025 Tier 1 (Split ASHP)	72.7%	8
CEE 2026 Tier 1 (Split ASHP)	72.7%	8
CEE Advanced Tier (Split ASHP)	0%	0
Xcel Energy Colorado cold-climate ASHP (2025)	63.6%	7
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.

STEALTH’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

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

Source: AHRI Directory · as of Oct 9, 2026

Share of comparable models beaten, per peer group
Size and duct type	Models	Index	COP@5°F	HSPF2	SEER2
Ducted, up to 1.5 tons	1	47%	63%	29%	55%
Ducted, 2 tons	1	37%	36%	44%	43%
Ducted, 2.5–3 tons	2	42%	42%	58%	63%
Ducted, 3.5–4.5 tons	2	51%	62%	73%	54%
Non-ducted, up to 1.5 tons	1	60%	63%	66%	58%
Non-ducted, 2 tons	1	72%	51%	70%	82%
Non-ducted, 2.5–3 tons	3	62%	53%	59%	70%

Every STEALTH model in the market

STEALTH’s 11 models with a known size and duct type, over the shape of the whole catalog.

STEALTH models by size and ratingColoured: STEALTH · grey shapes: all 14,508 models · lines: catalog medians by size

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

Dots: 11 stealth models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 14,508 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	826	1.64	1.71	1.75	1.85	2.24
Ducted, 1 ton	407	1.80	1.90	2.05	2.41	2.45
Ducted, 1.5 tons	992	1.75	1.86	2.00	2.17	2.40
Ducted, 2 tons	999	1.75	1.86	2.00	2.18	2.30
Ducted, 2.5 tons	1,040	1.70	1.80	2.00	2.10	2.36
Ducted, 3 tons	696	1.80	1.90	2.00	2.10	2.42
Ducted, 3.5 tons	864	1.70	1.80	2.00	2.10	2.46
Ducted, 4 tons	727	1.80	1.86	2.00	2.12	2.40
Ducted, 4.5 tons	690	1.70	1.80	1.90	2.10	2.20
Ducted, 5 tons	86	1.89	2.00	2.10	2.10	2.10
Non-ducted, 0.5 tons	1,186	1.75	1.80	1.90	2.00	2.22
Non-ducted, 1 ton	1,343	1.80	1.80	1.99	2.10	2.21
Non-ducted, 1.5 tons	1,261	1.80	1.80	2.00	2.10	2.31
Non-ducted, 2 tons	761	1.80	1.98	2.00	2.10	2.30
Non-ducted, 2.5 tons	403	1.80	1.85	2.00	2.00	2.10
Non-ducted, 3 tons	473	1.90	1.98	2.00	2.03	2.20
Non-ducted, 3.5 tons	280	2.00	2.00	2.00	2.05	2.10
Non-ducted, 4 tons	204	1.96	2.00	2.05	2.10	2.11
Non-ducted, 4.5 tons	78	1.90	1.91	1.95	2.01	2.01
Non-ducted, 5 tons	84	1.99	2.00	2.05	2.20	2.20

Source: AHRI Directory · as of Oct 9, 2026

Top STEALTH 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 5 STEALTH 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
1AC-48-HP-E-32STEALTH · Mini-spilt Ducted serieswith ducted air handler AC-48-AH-E-32	4 tons48,000 Btu/h · Ducted	84%	2.10	9.0	40,500	16.0	None	1	218729460	Ducted, 3.5–4.5 tons	72.2
2AC-24Z-E-M3STEALTH · Multi-spilt series	2 tons24,000 Btu/h · Non-ducted	90%	2.00	10.0	21,600	23.0	CEE 25CEE 26Xcel	1	218729440	Non-ducted, 2 tons	67.5
3AC-18Z-E-M2STEALTH · Multi-spilt series	1.5 tons17,700 Btu/h · Non-ducted	81%	2.00	10.0	14,500	22.0	CEE 25CEE 26Xcel	1	218729439	Non-ducted, up to 1.5 tons	64.5
4AC-60-HP-E-32STEALTH · Mini-spilt Ducted serieswith ducted air handler AC-60-AH-E-32	4.5 tons55,000 Btu/h · Ducted	75%	2.00	9.0	41,500	16.0	None	1	218729461	Ducted, 3.5–4.5 tons	62.9
5AC-42Z-E-M5STEALTH · Multi-spilt series	3 tons37,000 Btu/h · Non-ducted	88%	2.00	10.0	32,400	22.0	CEE 25CEE 26Xcel	1	218729443	Non-ducted, 2.5–3 tons	58.8

All-around best

Top 5 STEALTH 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
1AC-24Z-E-M3STEALTH · Multi-spilt series	2 tons24,000 Btu/h · Non-ducted	90%	2.00	10.0	23.0	12.5	CEE 25CEE 26Xcel	1	218729440	Non-ducted, 2 tons	71.8	67.5	76.1	67.5
2AC-30Z-E-M4STEALTH · Multi-spilt series	2.5 tons30,000 Btu/h · Non-ducted	82%	2.00	10.0	23.0	12.5	CEE 25CEE 26Xcel	1	218729441	Non-ducted, 2.5–3 tons	66.6	57.4	75.8	57.4
3AC-36Z-E-M4STEALTH · Multi-spilt series	3 tons36,000 Btu/h · Non-ducted	71%	2.00	10.0	23.0	12.3	CEE 25CEE 26Xcel	1	218729442	Non-ducted, 2.5–3 tons	62.6	51.2	73.9	51.2
4AC-18Z-E-M2STEALTH · Multi-spilt series	1.5 tons17,700 Btu/h · Non-ducted	81%	2.00	10.0	22.0	12.3	CEE 25CEE 26Xcel	1	218729439	Non-ducted, up to 1.5 tons	59.7	64.5	55.0	64.5
5AC-42Z-E-M5STEALTH · Multi-spilt series	3 tons37,000 Btu/h · Non-ducted	88%	2.00	10.0	22.0	12.0	CEE 25CEE 26Xcel	1	218729443	Non-ducted, 2.5–3 tons	57.7	58.8	56.5	58.8

Best model on each rating

STEALTH’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	AC-48-HP-E-32	2.10	Ducted, 3.5–4.5 tons	69%	218729460
Capacity retention at 5°F	AC-24Z-E-M3	90%	Non-ducted, 2 tons	79%	218729440
HSPF2	AC-48-HP-E-32	9.0	Ducted, 3.5–4.5 tons	69%	218729460
SEER2	AC-24Z-E-M3	23.0	Non-ducted, 2 tons	79%	218729440
EER2	AC-30Z-E-M4	12.5	Non-ducted, 2.5–3 tons	75%	218729441
Heating capacity at 5°F	AC-18Z-E-M2	14,500 Btu/h	Non-ducted, up to 1.5 tons	85%	218729439

All 11 STEALTH models in Explore

STEALTH 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.

STEALTH: 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, up to 1.5 tons	49.3(50 is the typical model of its size class)AC-18-HP-E-32with ducted air handler AC-18-AH-E-321 of 1 models qualify · AHRI 218729456	47.1(50 is the typical model of its size class)AC-18-HP-E-32with ducted air handler AC-18-AH-E-321 of 1 models have all five ratings · AHRI 218729456
Ducted, 2 tons	45.9(50 is the typical model of its size class)AC-24-HP-E-32with ducted air handler AC-24-AH-E-321 of 1 models qualify · AHRI 218729457	37.2(50 is the typical model of its size class)AC-24-HP-E-32with ducted air handler AC-24-AH-E-321 of 1 models have all five ratings · AHRI 218729457
Ducted, 2.5–3 tons	None on this board (0 of 2 models qualify)	42.6(50 is the typical model of its size class)AC-36-HP-E-32with ducted air handler AC-36-AH-E-322 of 2 models have all five ratings · AHRI 218729459
Ducted, 3.5–4.5 tons	72.2(50 is the typical model of its size class)AC-48-HP-E-32with ducted air handler AC-48-AH-E-322 of 2 models qualify · AHRI 218729460	53.2(50 is the typical model of its size class)AC-48-HP-E-32with ducted air handler AC-48-AH-E-322 of 2 models have all five ratings · AHRI 218729460
Non-ducted, up to 1.5 tons	64.5(50 is the typical model of its size class)AC-18Z-E-M21 of 1 models qualify · AHRI 218729439	59.7(50 is the typical model of its size class)AC-18Z-E-M21 of 1 models have all five ratings · AHRI 218729439
Non-ducted, 2 tons	67.5(50 is the typical model of its size class)AC-24Z-E-M31 of 1 models qualify · AHRI 218729440	71.8(50 is the typical model of its size class)AC-24Z-E-M31 of 1 models have all five ratings · AHRI 218729440
Non-ducted, 2.5–3 tons	58.8(50 is the typical model of its size class)AC-42Z-E-M53 of 3 models qualify · AHRI 218729443	66.6(50 is the typical model of its size class)AC-30Z-E-M43 of 3 models have all five ratings · AHRI 218729441

All-around board, every manufacturer

Newest STEALTH certifications

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

The 5 most recently certified STEALTH outdoor models
Outdoor model	Size · type	COP@5°F	Cap. 5/47	HSPF2	SEER2	Meets	Combos	AHRI ref.
AC-60-HP-E-32STEALTH · Mini-spilt Ducted serieswith ducted air handler AC-60-AH-E-32	4.5 tons55,000 Btu/h · Ducted	2.00	75%	9.0	16.0	None	1	218729461
AC-48-HP-E-32STEALTH · Mini-spilt Ducted serieswith ducted air handler AC-48-AH-E-32	4 tons48,000 Btu/h · Ducted	2.10	84%	9.0	16.0	None	1	218729460
AC-36-HP-E-32STEALTH · Mini-spilt Ducted serieswith ducted air handler AC-36-AH-E-32	3 tons35,000 Btu/h · Ducted	2.00	66%	8.6	17.0	None	1	218729459
AC-30-HP-E-32STEALTH · Mini-spilt Ducted serieswith ducted air handler AC-30-AH-E-32	2.5 tons30,000 Btu/h · Ducted	1.89	69%	8.5	18.0	CEE 25CEE 26	1	218729458
AC-24-HP-E-32STEALTH · Mini-spilt Ducted serieswith ducted air handler AC-24-AH-E-32	2 tons23,000 Btu/h · Ducted	1.89	78%	8.5	17.0	CEE 25CEE 26Xcel	1	218729457

Shares hardware with

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

No shared hardware found for STEALTH in this group.

Compare STEALTH

Manufacturers of a similar size, side by side.

Compare with any manufacturer

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