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, KLIMAIRE scores higher on 3 of the 6 ratings.

Century
KLIMAIRE
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Century	KLIMAIRE
Efficiency index	50%median —	55%median —
COP at 5°F	50%median 1.98	50%median 2.00
Capacity retention at 5°F	49% (higher)median 63%	48% (higher)median 72%
HSPF2	52%median 8.1	60%median 10.0
SEER2	45%median 15.2	61%median 21.2
EER2	53% (higher)median 11.4	52% (higher)median 12.0
Heating capacity at 5°F	49%median 19,000 Btu/h	55%median 18,900 Btu/h
Outdoor models	59	25
AHRI certifications	1,147	45

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)	44.1%26 models	76%19 models
CEE 2026 Tier 1 (Split ASHP)	44.1%26 models	76%19 models
CEE Advanced Tier (Split ASHP)	3.4%2 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	40.7%24 models	72%18 models
DOE Cold Climate Heat Pump Challenge	3.4%2 models	0%0 models
ENERGY STAR Cold Climate	32.2%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 · 8 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 11, 2026

Models per peer group · efficiency index within the group
Size and duct type	Century	KLIMAIRE
Ducted, up to 1.5 tons	8 · index 72%	2 · index 76%
Ducted, 2 tons	13 · index 41%	1 · index 65%
Ducted, 2.5–3 tons	14 · index 42%	3 · index 77%
Ducted, 3.5–4.5 tons	21 · index 39%	3 · index 84%
Ducted, 5 tons and up	None	1 · index 63%
Non-ducted, up to 1.5 tons	6 · index 77%	10 · index 47%
Non-ducted, 2 tons	1 · index 76%	3 · index 40%
Non-ducted, 2.5–3 tons	3 · index 67%	7 · index 45%
Non-ducted, 3.5–4.5 tons	2 · index 67%	4 · index 53%
Non-ducted, 5 tons and up	None	1 · index 27%

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	86.6(50 is the typical model of its size class) (higher)A-VXP18SA-1with ducted air handler WXP18SA6 of 8 models qualify · AHRI 217482412	72.6(50 is the typical model of its size class)KMIR319-H221-42 of 2 models qualify · AHRI 217489269
Ducted, 2 tons	85.7(50 is the typical model of its size class) (higher)A-VHP24SA-1with ducted air handler B-VHP24DA-17 of 14 models qualify · AHRI 217482470	48.6(50 is the typical model of its size class)KMIR427-H225-41 of 1 models qualify · AHRI 217489272
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	82.5(50 is the typical model of its size class)KMHR536-H224-43 of 3 models qualify · AHRI 217489290
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)KMHR648-H224-43 of 3 models qualify · AHRI 217489293
Ducted, 5 tons and up	No models in this size class	None on this board (0 of 1 models qualify)
Non-ducted, up to 1.5 tons	96.7(50 is the typical model of its size class) (higher)A-VHP06SA-1with ductless indoor unit B-VHP06SA-16 of 6 models qualify · AHRI 218425153	68.6(50 is the typical model of its size class)KMIP218-H225-47 of 10 models qualify · AHRI 218067072
Non-ducted, 2 tons	89.4(50 is the typical model of its size class) (higher)A-VHP24SA-1with ductless indoor unit B-VHP24CA-11 of 1 models qualify · AHRI 217482468	41.1(50 is the typical model of its size class)KMIR427-H225-42 of 3 models qualify · AHRI 217489271
Non-ducted, 2.5–3 tons	78.0(50 is the typical model of its size class) (higher)A-VHP365A-13 of 3 models qualify · AHRI 218425167	72.6(50 is the typical model of its size class)KMHR536-H224-45 of 7 models qualify · AHRI 217489291
Non-ducted, 3.5–4.5 tons	73.4(50 is the typical model of its size class) (higher)A-VHP486A-12 of 2 models qualify · AHRI 218425170	69.9(50 is the typical model of its size class)KMHR660-H218-44 of 4 models qualify · AHRI 217489297
Non-ducted, 5 tons and up	No models in this size class	None on this board (0 of 1 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	KLIMAIREAll-around score, best model
Ducted, up to 1.5 tons	86.5(50 is the typical model of its size class) (higher)A-VHP09SA-1with ducted air handler B-VHP09DA-18 of 8 models have all five ratings · AHRI 217482458	77.4(50 is the typical model of its size class)KMHR319-H221-42 of 2 models have all five ratings · AHRI 217489284
Ducted, 2 tons	78.4(50 is the typical model of its size class) (higher)A-VHP24SA-1with ducted air handler B-VHP24DA-112 of 12 models have all five ratings · AHRI 217482470	64.5(50 is the typical model of its size class)KMIR427-H225-41 of 1 models have all five ratings · AHRI 217489272
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)KMHR536-H224-43 of 3 models have all five ratings · AHRI 217489290
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)KMIR648-H224-43 of 3 models have all five ratings · AHRI 217489278
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	62.5(50 is the typical model of its size class)KMIR660-H218-41 of 1 models have all five ratings · AHRI 217489281
Non-ducted, up to 1.5 tons	96.2(50 is the typical model of its size class) (higher)A-VHP06SA-1with ductless indoor unit B-VHP06SA-16 of 6 models have all five ratings · AHRI 218425153	72.2(50 is the typical model of its size class)KMIP218-H225-410 of 10 models have all five ratings · AHRI 218067072
Non-ducted, 2 tons	76.4(50 is the typical model of its size class) (higher)A-VHP24SA-1with ductless indoor unit B-VHP24SA-11 of 1 models have all five ratings · AHRI 218425157	56.7(50 is the typical model of its size class)KMIR427-H225-43 of 3 models have all five ratings · AHRI 217489271
Non-ducted, 2.5–3 tons	78.3(50 is the typical model of its size class) (higher)A-VHP365A-13 of 3 models have all five ratings · AHRI 218425165	66.3(50 is the typical model of its size class)KMHR536-H224-47 of 7 models have all five ratings · AHRI 217489289
Non-ducted, 3.5–4.5 tons	75.6(50 is the typical model of its size class) (higher)A-VHP486A-12 of 2 models have all five ratings · AHRI 218425168	62.6(50 is the typical model of its size class)KMHR660-H218-44 of 4 models have all five ratings · AHRI 217489295
Non-ducted, 5 tons and up	No models in this size class	32.5(50 is the typical model of its size class)KMIR660-H218-41 of 1 models have all five ratings · AHRI 217489280

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% · 2.75SHP1448S1ADucted, 3.5–4.5 tons	beats 89% · 2.25KMIR319-H221-4Non-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 98% · 126%A-VHP09SA-1Non-ducted, up to 1.5 tons	beats 95% · 104%KMHR536-H224-4Non-ducted, 2.5–3 tons
HSPF2	beats 99% · 14.8A-VHP06SA-1Non-ducted, up to 1.5 tons	beats 99% · 11.0KMHR648-H224-4Ducted, 3.5–4.5 tons
SEER2	beats 100% · 27.0A-ZHP15SA-1Ducted, up to 1.5 tons	beats 96% · 20.4KMIR648-H224-4Ducted, 3.5–4.5 tons
EER2	beats 99% · 18.0A-VHP06SA-1Non-ducted, up to 1.5 tons	beats 85% · 13.0KMHR319-H221-4Ducted, up to 1.5 tons
Heating capacity at 5°F	beats 98% · 19,600 Btu/hA-VXP18SA-1Ducted, up to 1.5 tons	beats 94% · 37,400 Btu/hKMHR536-H224-4Non-ducted, 2.5–3 tons

More comparisons

Pick any two manufacturers

Century vs KLIMAIRE heat pumps