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.

Della and MRCOOL 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, MRCOOL scores higher on 6 of the 6 ratings.

Della
MRCOOL
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Della	MRCOOL
Efficiency index	39%median — · 27th ranked	54%median — · 15th ranked
COP at 5°F	42%median 1.80 · 25th ranked	49%median 1.94 · 18th ranked
Capacity retention at 5°F	37%median 70% · 26th ranked	41%median 64% · 24th ranked
HSPF2	23%median 8.5 · 27th ranked	51%median 8.6 · 15th ranked
SEER2	35%median 19.0 · 27th ranked	50%median 16.6 · 12th ranked
EER2	28%median 10.0 · 27th ranked	56%median 11.7 · 12th ranked
Heating capacity at 5°F	37%median 11,600 Btu/h · 26th ranked	43%median 17,800 Btu/h · 21st ranked
Outdoor models	22	111
AHRI certifications	22	361

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Della	MRCOOL
CEE 2025 Tier 1 (Split ASHP)	54.5%12 models	46.8%52 models
CEE 2026 Tier 1 (Split ASHP)	45.5%10 models	43.2%48 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	36.4%8 models	25.2%28 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	18.2%4 models	22.5%25 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

Della
MRCOOL
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	Della	MRCOOL
Ducted, up to 1.5 tons	None	8 · index 55%
Ducted, 2 tons	None	13 · index 57%
Ducted, 2.5–3 tons	None	24 · index 55%
Ducted, 3.5–4.5 tons	None	27 · index 55%
Ducted, 5 tons and up	None	4 · index 41%
Non-ducted, up to 1.5 tons	16 · index 43%	23 · index 56%
Non-ducted, 2 tons	3 · index 39%	7 · index 56%
Non-ducted, 2.5–3 tons	3 · index 27%	10 · index 45%
Non-ducted, 3.5–4.5 tons	None	2 · index 49%

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	DellaCold-climate score, best model	MRCOOLCold-climate score, best model
Ducted, up to 1.5 tons	No models in this size class	73.5(50 is the typical model of its size class)DIYH-18-HP-C-230C25with ducted air handler DIYH-18-HP-MUAH-230C252 of 8 models qualify · AHRI 210295926
Ducted, 2 tons	No models in this size class	69.5(50 is the typical model of its size class)CENTRAL-24-HP-C-230A00with ducted air handler CENTRAL-24-HP-MUAH230A005 of 11 models qualify · AHRI 211497151
Ducted, 2.5–3 tons	No models in this size class	74.8(50 is the typical model of its size class)CENTRAL-36-HP-C-230A00with ducted air handler CENTRAL-36-HP-MUAH230A006 of 26 models qualify · AHRI 210279122
Ducted, 3.5–4.5 tons	No models in this size class	77.1(50 is the typical model of its size class)CENTRAL-60-HP-C-230A00with ducted air handler CENTRAL-60-HP-MUAH230A006 of 27 models qualify · AHRI 210279124
Ducted, 5 tons and up	No models in this size class	None on this board (0 of 4 models qualify)
Non-ducted, up to 1.5 tons	68.8(50 is the typical model of its size class)048-TP-12K2V-23S-OUTwith ductless indoor unit 048-TP-12K2V-23S-IN8 of 16 models qualify · AHRI 213927343	86.0(50 is the typical model of its size class) (higher)O-ES-09-HP-C-230Bwith ductless indoor unit O-09-HP-WMAH-230B8 of 23 models qualify · AHRI 208552810
Non-ducted, 2 tons	None on this board (0 of 3 models qualify)	84.5(50 is the typical model of its size class)O-HH-24-HP-C-230Awith ductless indoor unit O-24-HP-WMAH-230BAlso listed as O-HH-24-HP-C-230B3 of 7 models qualify · AHRI 207339164
Non-ducted, 2.5–3 tons	None on this board (0 of 3 models qualify)	53.7(50 is the typical model of its size class)DIY-MULTI3-27HP230C1 of 10 models qualify · AHRI 207339195
Non-ducted, 3.5–4.5 tons	No models in this size class	None on this board (0 of 2 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	DellaAll-around score, best model	MRCOOLAll-around score, best model
Ducted, up to 1.5 tons	No models in this size class	59.4(50 is the typical model of its size class)MULTI2-18HP230B4 of 8 models have all five ratings · AHRI 208552830
Ducted, 2 tons	No models in this size class	68.2(50 is the typical model of its size class)DIYH-24-HP-C-230C25with ducted air handler DIYH-24-HP-MUAH-230C2510 of 13 models have all five ratings · AHRI 210288098
Ducted, 2.5–3 tons	No models in this size class	75.4(50 is the typical model of its size class)MULTI3-27HP230B14 of 24 models have all five ratings · AHRI 208552953
Ducted, 3.5–4.5 tons	No models in this size class	69.0(50 is the typical model of its size class)MHP17048A-*Awith indoor coil MCHP51CNPA+TDR+TXV and furnace MGM80SE090C5A16 of 27 models have all five ratings · AHRI 211737253
Ducted, 5 tons and up	No models in this size class	62.6(50 is the typical model of its size class)MHP17060A-**Awith indoor coil MCVP60CNPA+TDR and furnace MGM80SE090C5A2 of 4 models have all five ratings · AHRI 212619860
Non-ducted, up to 1.5 tons	70.8(50 is the typical model of its size class)048-TP-12K2V-23S-OUTwith ductless indoor unit 048-TP-12K2V-23S-IN10 of 16 models have all five ratings · AHRI 213927343	88.4(50 is the typical model of its size class) (higher)O-ES-09-HP-C-230Bwith ductless indoor unit O-09-HP-WMAH-230B23 of 23 models have all five ratings · AHRI 208552810
Non-ducted, 2 tons	53.0(50 is the typical model of its size class)048-TP-24K2V-20S-OUTwith ductless indoor unit 048-TP-24K2V-20S-IN2 of 3 models have all five ratings · AHRI 213927345	84.3(50 is the typical model of its size class) (higher)O-HH-24-HP-C-230Awith ductless indoor unit O-24-HP-WMAH-230BAlso listed as O-HH-24-HP-C-230B7 of 7 models have all five ratings · AHRI 207339164
Non-ducted, 2.5–3 tons	29.5(50 is the typical model of its size class)048-TL-36K-MODU3 of 3 models have all five ratings · AHRI 211042067	78.2(50 is the typical model of its size class) (higher)MULTI3-27HP230B7 of 10 models have all five ratings · AHRI 208552834
Non-ducted, 3.5–4.5 tons	No models in this size class	56.1(50 is the typical model of its size class)MULTI5-48HP230B2 of 2 models have all five ratings · AHRI 208552838

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	Della	MRCOOL
COP at 5°F	beats 89% · 2.21048-TP-18K2V-22S-OUTNon-ducted, up to 1.5 tons	beats 97% · 2.39O-ES-12-HP-C-230BNon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 64% · 77%048-TP-9K2V-23S-OUTNon-ducted, up to 1.5 tons	beats 97% · 98%MDPH180484Ducted, 3.5–4.5 tons
HSPF2	beats 57% · 9.5048-TP-12K2V-23S-OUTNon-ducted, up to 1.5 tons	beats 98% · 9.8DIY-MULTI5-48HP230CDucted, 3.5–4.5 tons
SEER2	beats 79% · 23.5048-TP-9K2V-23S-OUTNon-ducted, up to 1.5 tons	beats 99% · 24.6MULTI3-27HP230BNon-ducted, 2.5–3 tons
EER2	beats 68% · 13.0048-TP-9K2V-23S-OUTNon-ducted, up to 1.5 tons	beats 99% · 14.0MHP17024A-**ADucted, 2 tons
Heating capacity at 5°F	beats 78% · 13,000 Btu/h048-TL-18K-MODUNon-ducted, up to 1.5 tons	beats 99% · 54,356 Btu/hCENTRAL-60-HP-C-230A00Ducted, 3.5–4.5 tons

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Della vs MRCOOL heat pumps