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 6 of the 6 ratings.

Century
ECO-AIR
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Century	ECO-AIR
Efficiency index	50%median —	65%median —
COP at 5°F	50%median 1.98	62%median 2.00
Capacity retention at 5°F	49%median 63%	61%median 81%
HSPF2	52%median 8.1	73%median 9.9
SEER2	45%median 15.2	69%median 20.7
EER2	53%median 11.4	59%median 12.0
Heating capacity at 5°F	49%median 19,000 Btu/h	64%median 25,100 Btu/h
Outdoor models	59	60
AHRI certifications	1,147	288

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)	44.1%26 models	90%54 models
CEE 2026 Tier 1 (Split ASHP)	44.1%26 models	88.3%53 models
CEE Advanced Tier (Split ASHP)	3.4%2 models	1.7%1 models
Xcel Energy Colorado cold-climate ASHP (2025)	40.7%24 models	80%48 models
DOE Cold Climate Heat Pump Challenge	3.4%2 models	1.7%1 models
ENERGY STAR Cold Climate	32.2%19 models	81.7%49 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 · 8 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 9, 2026

Models per peer group · efficiency index within the group
Size and duct type	Century	ECO-AIR
Ducted, up to 1.5 tons	8 · index 72%	13 · index 75%
Ducted, 2 tons	13 · index 41%	6 · index 63%
Ducted, 2.5–3 tons	14 · index 42%	13 · index 66%
Ducted, 3.5–4.5 tons	21 · index 39%	14 · index 66%
Ducted, 5 tons and up	None	3 · index 63%
Non-ducted, up to 1.5 tons	6 · index 77%	18 · index 63%
Non-ducted, 2 tons	1 · index 76%	3 · index 64%
Non-ducted, 2.5–3 tons	3 · index 67%	13 · index 59%
Non-ducted, 3.5–4.5 tons	2 · index 67%	8 · index 60%
Non-ducted, 5 tons and up	None	2 · index 59%

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	86.6(50 is the typical model of its size class)A-VXP18SA-1with ducted air handler WXP18SA6 of 8 models qualify · AHRI 217482412	93.5(50 is the typical model of its size class) (higher)EDSO-06Hwith ducted air handler EDLS-06U12 of 13 models qualify · AHRI 216759958
Ducted, 2 tons	85.7(50 is the typical model of its size class)A-VHP24SA-1with ducted air handler B-VHP24DA-17 of 14 models qualify · AHRI 217482470	85.7(50 is the typical model of its size class)EDSO-24Hwith ducted air handler EDHS-24U6 of 6 models qualify · AHRI 216759968
Ducted, 2.5–3 tons	82.5(50 is the typical model of its size class)A-VHP365A-14 of 13 models qualify · AHRI 218425166	83.2(50 is the typical model of its size class) (higher)EDSO-36Hwith ducted air handler EDHS-36U11 of 13 models qualify · AHRI 216759969
Ducted, 3.5–4.5 tons	82.7(50 is the typical model of its size class)A-VHP486A-18 of 21 models qualify · AHRI 218425169	82.7(50 is the typical model of its size class)EDMO-48HAlso sold as Eco Air EDMO-48H-6GX14 of 14 models qualify · AHRI 216760010
Ducted, 5 tons and up	No models in this size class	None on this board (0 of 3 models qualify)
Non-ducted, up to 1.5 tons	96.7(50 is the typical model of its size class)A-VHP06SA-1with ductless indoor unit B-VHP06SA-16 of 6 models qualify · AHRI 218425153	96.7(50 is the typical model of its size class)EDSO-06Hwith ductless indoor unit EDWM-06U14 of 18 models qualify · AHRI 216759979
Non-ducted, 2 tons	89.4(50 is the typical model of its size class)A-VHP24SA-1with ductless indoor unit B-VHP24CA-11 of 1 models qualify · AHRI 217482468	89.4(50 is the typical model of its size class)EDSO-24Hwith ductless indoor unit ED4W-24U3 of 3 models qualify · AHRI 216759948
Non-ducted, 2.5–3 tons	78.0(50 is the typical model of its size class)A-VHP365A-13 of 3 models qualify · AHRI 218425167	78.0(50 is the typical model of its size class)EDMO-36HAlso sold as Eco Air EDMO-36H-5GX11 of 13 models qualify · AHRI 216760008
Non-ducted, 3.5–4.5 tons	73.4(50 is the typical model of its size class)A-VHP486A-12 of 2 models qualify · AHRI 218425170	73.4(50 is the typical model of its size class)EDMO-48HAlso sold as Eco Air EDMO-48H-6GX8 of 8 models qualify · AHRI 216760011
Non-ducted, 5 tons and up	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	CenturyAll-around score, best model	ECO-AIRAll-around score, best model
Ducted, up to 1.5 tons	86.5(50 is the typical model of its size class)A-VHP09SA-1with ducted air handler B-VHP09DA-18 of 8 models have all five ratings · AHRI 217482458	95.0(50 is the typical model of its size class) (higher)EDSO-06Hwith ducted air handler EDLS-06U13 of 13 models have all five ratings · AHRI 216759958
Ducted, 2 tons	78.4(50 is the typical model of its size class)A-VHP24SA-1with ducted air handler B-VHP24DA-112 of 12 models have all five ratings · AHRI 217482470	78.8(50 is the typical model of its size class) (higher)EDSO-24Ewith ducted air handler EDHS-24U6 of 6 models have all five ratings · AHRI 216759975
Ducted, 2.5–3 tons	83.6(50 is the typical model of its size class)A-VHP365A-113 of 13 models have all five ratings · AHRI 218425166	83.6(50 is the typical model of its size class)EDMO-36HAlso sold as Eco Air EDMO-36H-5GX13 of 13 models have all five ratings · AHRI 216760007
Ducted, 3.5–4.5 tons	83.9(50 is the typical model of its size class)A-VHP486A-122 of 22 models have all five ratings · AHRI 218425169	85.1(50 is the typical model of its size class) (higher)EDMO-48EAlso sold as Eco Air EDMO-48E-6GX14 of 14 models have all five ratings · AHRI 216759995
Ducted, 5 tons and up	66.7(50 is the typical model of its size class) (higher)HSA1460S1-*Awith ducted air handler HMA60VX1-1 of 1 models have all five ratings · AHRI 216370485	65.3(50 is the typical model of its size class)EDSO-60Ewith ducted air handler EDHS-60U3 of 3 models have all five ratings · AHRI 216759978
Non-ducted, up to 1.5 tons	96.2(50 is the typical model of its size class)A-VHP06SA-1with ductless indoor unit B-VHP06SA-16 of 6 models have all five ratings · AHRI 218425153	96.2(50 is the typical model of its size class)EDSO-06Hwith ductless indoor unit EDWM-06U18 of 18 models have all five ratings · AHRI 216759979
Non-ducted, 2 tons	76.4(50 is the typical model of its size class)A-VHP24SA-1with ductless indoor unit B-VHP24SA-11 of 1 models have all five ratings · AHRI 218425157	86.8(50 is the typical model of its size class) (higher)EDSO-24Ewith ductless indoor unit EDWM-24U3 of 3 models have all five ratings · AHRI 216759939
Non-ducted, 2.5–3 tons	78.3(50 is the typical model of its size class)A-VHP365A-13 of 3 models have all five ratings · AHRI 218425165	78.3(50 is the typical model of its size class)EDMO-36HAlso sold as Eco Air EDMO-36H-5GX13 of 13 models have all five ratings · AHRI 216760006
Non-ducted, 3.5–4.5 tons	75.6(50 is the typical model of its size class)A-VHP486A-12 of 2 models have all five ratings · AHRI 218425168	75.6(50 is the typical model of its size class)EDMO-48HAlso sold as Eco Air EDMO-48H-6GX8 of 8 models have all five ratings · AHRI 216760009
Non-ducted, 5 tons and up	No models in this size class	58.6(50 is the typical model of its size class)EDMO-60EAlso sold as Eco Air EDMO-60E-6GX2 of 2 models have all five ratings · AHRI 216759997

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% · 2.75SHP1448S1ADucted, 3.5–4.5 tons	beats 99% · 2.54EDSO-24ENon-ducted, 2 tons
Capacity retention at 5°F	beats 98% · 126%A-VHP09SA-1Non-ducted, up to 1.5 tons	beats 98% · 120%EDSO-09HDucted, up to 1.5 tons
HSPF2	beats 99% · 14.8A-VHP06SA-1Non-ducted, up to 1.5 tons	beats 99% · 14.8EDSO-06HNon-ducted, up to 1.5 tons
SEER2	beats 100% · 27.0A-ZHP15SA-1Ducted, up to 1.5 tons	beats 97% · 25.0EDMO-27EAlso sold as Eco Air EDMO-27E-4GXNon-ducted, 2.5–3 tons
EER2	beats 99% · 18.0A-VHP06SA-1Non-ducted, up to 1.5 tons	beats 99% · 18.0EDSO-06HNon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 98% · 19,600 Btu/hA-VXP18SA-1Ducted, up to 1.5 tons	beats 97% · 19,000 Btu/hEDMO-18HAlso sold as Eco Air EDMO-18H-3GXNon-ducted, up to 1.5 tons

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Century vs ECO-AIR heat pumps