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.

Century and ECO-AIR 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, ECO-AIR scores higher on 4 of the 6 ratings.

Century
ECO-AIR
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Century	ECO-AIR
Efficiency index	54%median —	56%median —
COP at 5°F	57% (higher)median 2.00	51% (higher)median 1.98
Capacity retention at 5°F	52%median 65%	53%median 68%
HSPF2	44%median 8.0	69%median 9.4
SEER2	40%median 15.6	62%median 19.3
EER2	53% (higher)median 11.0	47% (higher)median 10.9
Heating capacity at 5°F	51%median 19,800 Btu/h	56%median 20,000 Btu/h
Outdoor models	63	58
AHRI certifications	6,901	142

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Century	ECO-AIR
CEE 2025 Tier 1 (Split ASHP)	44.4%28 models	62.1%36 models
CEE 2026 Tier 1 (Split ASHP)	42.9%27 models	58.6%34 models
CEE Advanced Tier (Split ASHP)	0%0 models	1.7%1 models
Xcel Energy Colorado cold-climate ASHP (2025)	27%17 models	44.8%26 models
DOE Cold Climate Heat Pump Challenge	0%0 models	1.7%1 models
ENERGY STAR Cold Climate	30.2%19 models	50%29 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 · 9 groups where both have models

Century
ECO-AIR
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	Century	ECO-AIR
Ducted, up to 1.5 tons	6 · index 48%	12 · index 61%
Ducted, 2 tons	6 · index 42%	4 · index 70%
Ducted, 2.5–3 tons	15 · index 60%	15 · index 53%
Ducted, 3.5–4.5 tons	18 · index 58%	10 · index 56%
Ducted, 5 tons and up	1 · index 19%	2 · index 49%
Non-ducted, up to 1.5 tons	10 · index 50%	18 · index 55%
Non-ducted, 2 tons	2 · index 49%	5 · index 53%
Non-ducted, 2.5–3 tons	8 · index 63%	10 · index 58%
Non-ducted, 3.5–4.5 tons	3 · index 65%	6 · index 52%

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	CenturyCold-climate score, best model	ECO-AIRCold-climate score, best model
Ducted, up to 1.5 tons	63.7(50 is the typical model of its size class)A-VCD18SA-1with ducted air handler MCD18/24B1A2 of 6 models qualify · AHRI 212940799	86.9(50 is the typical model of its size class) (higher)MOX430U-18HFN1-Mwith ducted air handler MVBE-18HWFN1-MM3E9 of 12 models qualify · AHRI 213307908
Ducted, 2 tons	66.5(50 is the typical model of its size class)A-VCD24SA-1with ducted air handler B-VCD24SA-11 of 6 models qualify · AHRI 212940802	80.3(50 is the typical model of its size class) (higher)MOD33-24HFN1-MT0Wwith ducted air handler MTIU-24HWFN1-M4 of 4 models qualify · AHRI 211644052
Ducted, 2.5–3 tons	79.9(50 is the typical model of its size class)A-VMH36QV-1A5 of 15 models qualify · AHRI 214415109	79.9(50 is the typical model of its size class)MOE30U-36HFN1-M(GA)with ducted air handler MTI-36HWFN1-M7 of 15 models qualify · AHRI 211644066
Ducted, 3.5–4.5 tons	74.9(50 is the typical model of its size class)A-VMH48PV-14 of 18 models qualify · AHRI 214442638	86.4(50 is the typical model of its size class) (higher)MOE30U-48HFN1-M-[X](GA)with ducted air handler MTI-48HWFN1-M7 of 11 models qualify · AHRI 211644067
Ducted, 5 tons and up	None on this board (0 of 1 models qualify)	None on this board (0 of 1 models qualify)
Non-ducted, up to 1.5 tons	89.3(50 is the typical model of its size class)A-VMH06SV-1with ductless indoor unit B-VMH06SV-16 of 10 models qualify · AHRI 212940813	89.3(50 is the typical model of its size class)MOX230-09HFN1-MW5Wwith ductless indoor unit MSEPB-06HRFN1-MY5W9 of 18 models qualify · AHRI 208121863
Non-ducted, 2 tons	84.5(50 is the typical model of its size class)A-VMH24SV-1with ductless indoor unit B-VMH24SV-11 of 2 models qualify · AHRI 212940817	86.1(50 is the typical model of its size class) (higher)MOD30-24HFN1-MU0Wwith ductless indoor unit MCD1-24HRFN1-MT0W(GA)2 of 5 models qualify · AHRI 211644071
Non-ducted, 2.5–3 tons	90.9(50 is the typical model of its size class) (higher)A-VMH36QV-1A4 of 8 models qualify · AHRI 214415107	87.0(50 is the typical model of its size class)M4OX630-36HFN1-M1X4 of 10 models qualify · AHRI 213307915
Non-ducted, 3.5–4.5 tons	76.2(50 is the typical model of its size class)A-VMH48PV-12 of 3 models qualify · AHRI 214442637	76.2(50 is the typical model of its size class)M5OG-48HFN1-M-[X]3 of 6 models qualify · AHRI 209319647

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	CenturyAll-around score, best model	ECO-AIRAll-around score, best model
Ducted, up to 1.5 tons	63.4(50 is the typical model of its size class)A-VCD18SA-1with ducted air handler B-VCD18SA-15 of 6 models have all five ratings · AHRI 212940800	85.2(50 is the typical model of its size class) (higher)MOX330-09HFN1-MY5Wwith ducted air handler MTIU-09HWFN1-M12 of 12 models have all five ratings · AHRI 211644062
Ducted, 2 tons	72.4(50 is the typical model of its size class)HRG1836S1Pwith indoor coil EAH1P30B+TDR+TXV and furnace GUH97M070B3M5 of 7 models have all five ratings · AHRI 212604310	83.8(50 is the typical model of its size class) (higher)MOD33-24HFN1-MT0Wwith ducted air handler MTIU-24HWFN1-M4 of 4 models have all five ratings · AHRI 211644052
Ducted, 2.5–3 tons	83.7(50 is the typical model of its size class)A-VMH36QV-1A9 of 13 models have all five ratings · AHRI 214415109	83.7(50 is the typical model of its size class)M4OX630-36HFN1-M1X15 of 15 models have all five ratings · AHRI 213307916
Ducted, 3.5–4.5 tons	82.0(50 is the typical model of its size class)A-VMH48PV-112 of 19 models have all five ratings · AHRI 214442638	82.0(50 is the typical model of its size class)M5OG-48HFN1-M-[X]11 of 11 models have all five ratings · AHRI 209319648
Ducted, 5 tons and up	19.3(50 is the typical model of its size class)RHP6000S1A1 of 1 models have all five ratings · AHRI 214076319	57.1(50 is the typical model of its size class) (higher)MOE30U-60HFN1-M(GA)(X)with ducted air handler MHG-60HWFN1-MW1 of 1 models have all five ratings · AHRI 211644055
Non-ducted, up to 1.5 tons	92.0(50 is the typical model of its size class)A-VMH06SV-1with ductless indoor unit B-VMH06SV-110 of 10 models have all five ratings · AHRI 212940813	92.0(50 is the typical model of its size class)MOX230-09HFN1-MW5Wwith ductless indoor unit MSEPB-06HRFN1-MY5W18 of 18 models have all five ratings · AHRI 208121863
Non-ducted, 2 tons	84.3(50 is the typical model of its size class)A-VMH24SV-1with ductless indoor unit B-VMH24SV-12 of 2 models have all five ratings · AHRI 212940817	84.3(50 is the typical model of its size class)MOD30-24HFN1-MU0Wwith ductless indoor unit MSEPD-24HRFN1-MU0W5 of 5 models have all five ratings · AHRI 208121867
Non-ducted, 2.5–3 tons	86.4(50 is the typical model of its size class) (higher)A-VMH36QV-1A6 of 8 models have all five ratings · AHRI 214415107	82.8(50 is the typical model of its size class)M4OI-36HFN1-M10 of 10 models have all five ratings · AHRI 209319644
Non-ducted, 3.5–4.5 tons	77.9(50 is the typical model of its size class)A-VMH48PV-12 of 3 models have all five ratings · AHRI 214442637	77.9(50 is the typical model of its size class)M5OG-48HFN1-M-[X]6 of 6 models have all five ratings · AHRI 209319647

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	Century	ECO-AIR
COP at 5°F	beats 98% · 2.88HRG1548S1R-**ADucted, 3.5–4.5 tons	beats 98% · 2.45MOX230-12HFN1-MV5WNon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 97% · 103%A-VMH36QV-1ANon-ducted, 2.5–3 tons	beats 97% · 111%MOX430U-18HFN1-MDucted, up to 1.5 tons
HSPF2	beats 98% · 13.6A-VMH06SV-1Non-ducted, up to 1.5 tons	beats 99% · 10.3MOE30U-48HFN1-M-[X](GA)Ducted, 3.5–4.5 tons
SEER2	beats 99% · 20.9A-VMH48PV-1Ducted, 3.5–4.5 tons	beats 99% · 24.6M3OJ-27HFN1-MNon-ducted, 2.5–3 tons
EER2	beats 100% · 13.5HRG1548S1R-**ADucted, 3.5–4.5 tons	beats 98% · 16.2MOX330-09HFN1-MY5WNon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 96% · 20,000 Btu/hA-VMH18DV-1Non-ducted, up to 1.5 tons	beats 98% · 41,000 Btu/hMOE30U-36HFN1-M(GA)Non-ducted, 2.5–3 tons

More comparisons

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Century vs ECO-AIR heat pumps