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 KLIMAIRE 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, Century scores higher on 4 of the 6 ratings.

Century
KLIMAIRE
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Century	KLIMAIRE
Efficiency index	54% (higher)median —	52% (higher)median —
COP at 5°F	57% (higher)median 2.00	46% (higher)median 1.90
Capacity retention at 5°F	52% (higher)median 65%	44% (higher)median 66%
HSPF2	44%median 8.0	53%median 9.0
SEER2	40%median 15.6	54%median 19.0
EER2	53% (higher)median 11.0	40% (higher)median 10.0
Heating capacity at 5°F	51% (higher)median 19,800 Btu/h	44% (higher)median 15,500 Btu/h
Outdoor models	63	63
AHRI certifications	6,901	107

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Century	KLIMAIRE
CEE 2025 Tier 1 (Split ASHP)	44.4%28 models	52.4%33 models
CEE 2026 Tier 1 (Split ASHP)	42.9%27 models	46%29 models
CEE Advanced Tier (Split ASHP)	0%0 models	1.6%1 models
Xcel Energy Colorado cold-climate ASHP (2025)	27%17 models	33.3%21 models
DOE Cold Climate Heat Pump Challenge	0%0 models	1.6%1 models
ENERGY STAR Cold Climate	30.2%19 models	0%0 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
KLIMAIRE
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	KLIMAIRE
Ducted, up to 1.5 tons	6 · index 48%	7 · index 68%
Ducted, 2 tons	6 · index 42%	4 · index 76%
Ducted, 2.5–3 tons	15 · index 60%	7 · index 57%
Ducted, 3.5–4.5 tons	18 · index 58%	5 · index 53%
Ducted, 5 tons and up	1 · index 19%	3 · index 56%
Non-ducted, up to 1.5 tons	10 · index 50%	29 · index 49%
Non-ducted, 2 tons	2 · index 49%	8 · index 49%
Non-ducted, 2.5–3 tons	8 · index 63%	15 · index 40%
Non-ducted, 3.5–4.5 tons	3 · index 65%	6 · index 41%

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	KLIMAIRECold-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	74.9(50 is the typical model of its size class) (higher)KSIH009-H225-O-2with ducted air handler KDIP09-H26 of 7 models qualify · AHRI 209862170
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)KSIE024-H220-O-2with ducted air handler KDIP24-H24 of 4 models qualify · AHRI 209862163
Ducted, 2.5–3 tons	79.9(50 is the typical model of its size class) (higher)A-VMH36QV-1A5 of 15 models qualify · AHRI 214415109	74.7(50 is the typical model of its size class)KOIF36H2-1Swith ducted air handler KIDF36H2-1S3 of 7 models qualify · AHRI 212316042
Ducted, 3.5–4.5 tons	74.9(50 is the typical model of its size class) (higher)A-VMH48PV-14 of 18 models qualify · AHRI 214442638	73.8(50 is the typical model of its size class)KOIF48H2-1Swith ducted air handler KIDF48H2-1S2 of 5 models qualify · AHRI 212316043
Ducted, 5 tons and up	None on this board (0 of 1 models qualify)	None on this board (0 of 3 models qualify)
Non-ducted, up to 1.5 tons	89.3(50 is the typical model of its size class) (higher)A-VMH06SV-1with ductless indoor unit B-VMH06SV-16 of 10 models qualify · AHRI 212940813	80.2(50 is the typical model of its size class)KSIE009-H221-O-2with ductless indoor unit KSIE009-H221-IW-212 of 29 models qualify · AHRI 209862149
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)KSIH024-H220-O-2with ductless indoor unit KTIS24-H23 of 8 models qualify · AHRI 212316044
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	49.3(50 is the typical model of its size class)KMIR327-H217-22 of 15 models qualify · AHRI 209862187
Non-ducted, 3.5–4.5 tons	76.2(50 is the typical model of its size class) (higher)A-VMH48PV-12 of 3 models qualify · AHRI 214442637	56.3(50 is the typical model of its size class)KSIR048-H218-2with ductless indoor unit KFUF048-H2G11 of 6 models qualify · AHRI 209862179

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	KLIMAIREAll-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)KSIH009-H225-O-2with ducted air handler KDIP09-H27 of 7 models have all five ratings · AHRI 209862170
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)KSIE024-H220-O-2with ducted air handler KDIP24-H24 of 4 models have all five ratings · AHRI 209862163
Ducted, 2.5–3 tons	83.7(50 is the typical model of its size class) (higher)A-VMH36QV-1A9 of 13 models have all five ratings · AHRI 214415109	72.0(50 is the typical model of its size class)KMIR430-H217-26 of 7 models have all five ratings · AHRI 209862191
Ducted, 3.5–4.5 tons	82.0(50 is the typical model of its size class) (higher)A-VMH48PV-112 of 19 models have all five ratings · AHRI 214442638	63.5(50 is the typical model of its size class)KMIR545-H219-24 of 5 models have all five ratings · AHRI 209862197
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)KSIR060-H218-2with ducted air handler KDIS060-H2G1Also listed as KSIR060-H218-2(3)3 of 3 models have all five ratings · AHRI 209862177
Non-ducted, up to 1.5 tons	92.0(50 is the typical model of its size class) (higher)A-VMH06SV-1with ductless indoor unit B-VMH06SV-110 of 10 models have all five ratings · AHRI 212940813	84.4(50 is the typical model of its size class)KSIH009-H225-O-2with ductless indoor unit KSIH009-H225-IW-224 of 29 models have all five ratings · AHRI 209862153
Non-ducted, 2 tons	84.3(50 is the typical model of its size class) (higher)A-VMH24SV-1with ductless indoor unit B-VMH24SV-12 of 2 models have all five ratings · AHRI 212940817	72.0(50 is the typical model of its size class)KSIE024-H220-O-2with ductless indoor unit KUIR24-H26 of 8 models have all five ratings · AHRI 209862165
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	66.7(50 is the typical model of its size class)KMIR327-H217-210 of 15 models have all five ratings · AHRI 209862187
Non-ducted, 3.5–4.5 tons	77.9(50 is the typical model of its size class) (higher)A-VMH48PV-12 of 3 models have all five ratings · AHRI 214442637	48.3(50 is the typical model of its size class)KMIR545-H219-24 of 6 models have all five ratings · AHRI 209862196

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	KLIMAIRE
COP at 5°F	beats 98% · 2.88HRG1548S1R-**ADucted, 3.5–4.5 tons	beats 96% · 2.38KSIE018-H220-O-2Non-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 97% · 103%A-VMH36QV-1ANon-ducted, 2.5–3 tons	beats 93% · 108%KSIH009-H225-O-2Ducted, up to 1.5 tons
HSPF2	beats 98% · 13.6A-VMH06SV-1Non-ducted, up to 1.5 tons	beats 98% · 12.0KSIH009-H225-O-2Ducted, up to 1.5 tons
SEER2	beats 99% · 20.9A-VMH48PV-1Ducted, 3.5–4.5 tons	beats 98% · 21.0KMIR327-H217-2Ducted, 2.5–3 tons
EER2	beats 100% · 13.5HRG1548S1R-**ADucted, 3.5–4.5 tons	beats 95% · 15.8KSIH009-H225-O-2Non-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 95% · 48,500 Btu/hKOIF60H2-1SDucted, 3.5–4.5 tons

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Century vs KLIMAIRE heat pumps