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.

Lennox and Rheem 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, Rheem scores higher on 3 of the 6 ratings.

Lennox
Rheem
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Lennox	Rheem
Efficiency index	56% (higher)median — · 13th ranked	54% (higher)median — · 16th ranked
COP at 5°F	58%median 2.00 · 10th ranked	69%median 2.10 · 4th ranked
Capacity retention at 5°F	48%median 67% · 19th ranked	59%median 73% · 10th ranked
HSPF2	49%median 8.5 · 17th ranked	49%median 8.1 · 18th ranked
SEER2	49% (higher)median 17.0 · 17th ranked	44% (higher)median 16.0 · 21st ranked
EER2	54% (higher)median 11.6 · 14th ranked	46% (higher)median 10.6 · 20th ranked
Heating capacity at 5°F	48%median 18,560 Btu/h · 18th ranked	58%median 22,000 Btu/h · 8th ranked
Outdoor models	313	291
AHRI certifications	75,630	15,614

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Lennox	Rheem
CEE 2025 Tier 1 (Split ASHP)	46%144 models	40.2%117 models
CEE 2026 Tier 1 (Split ASHP)	45%141 models	39.2%114 models
CEE Advanced Tier (Split ASHP)	1%3 models	5.5%16 models
Xcel Energy Colorado cold-climate ASHP (2025)	29.4%92 models	35.1%102 models
DOE Cold Climate Heat Pump Challenge	1%3 models	5.5%16 models
ENERGY STAR Cold Climate	19.8%62 models	15.5%45 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

Lennox
Rheem
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	Lennox	Rheem
Ducted, up to 1.5 tons	31 · index 60%	25 · index 40%
Ducted, 2 tons	35 · index 58%	32 · index 49%
Ducted, 2.5–3 tons	72 · index 55%	64 · index 51%
Ducted, 3.5–4.5 tons	86 · index 57%	85 · index 52%
Ducted, 5 tons and up	13 · index 45%	17 · index 69%
Non-ducted, up to 1.5 tons	66 · index 54%	59 · index 64%
Non-ducted, 2 tons	22 · index 57%	12 · index 64%
Non-ducted, 2.5–3 tons	37 · index 55%	20 · index 57%
Non-ducted, 3.5–4.5 tons	16 · index 57%	8 · index 50%
Non-ducted, 5 tons and up	1 · index 36%	None

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	LennoxCold-climate score, best model	RheemCold-climate score, best model
Ducted, up to 1.5 tons	77.6(50 is the typical model of its size class)MPC009S4S-1Pwith ducted air handler MMDB009S4-*PAlso sold as AirEase 4DHPS209S-1P21 of 31 models qualify · AHRI 211034423	83.5(50 is the typical model of its size class) (higher)RO1HHZ12AJ8Swith ducted air handler RIMHHZ12AJ8S13 of 26 models qualify · AHRI 210824724
Ducted, 2 tons	81.1(50 is the typical model of its size class) (higher)MPC024S4S-1Pwith ducted air handler MMDB024S4-*PAlso sold as AirEase 4DHP2S24S-1P17 of 34 models qualify · AHRI 211034426	75.4(50 is the typical model of its size class)UOMH24FXZHJAlso listed as ROMH24FXZHJ, RO3HFZ24AJ1H14 of 31 models qualify · AHRI 10595427
Ducted, 2.5–3 tons	83.4(50 is the typical model of its size class)MLB036S4S-1Pwith ducted air handler MMDB036S4-2PAlso listed as MLB036S4S-2P23 of 74 models qualify · AHRI 205782160	86.6(50 is the typical model of its size class) (higher)RO1HHZ30AJ8Swith ducted air handler RIMHHZ30AJ8S24 of 64 models qualify · AHRI 211781741
Ducted, 3.5–4.5 tons	88.9(50 is the typical model of its size class) (higher)MLB048S4S-1Pwith ducted air handler MMDB048S4-2P18 of 85 models qualify · AHRI 205782161	87.0(50 is the typical model of its size class)ROSH42VGSNwith ducted air handler RIDH42AXCJAlso sold as RUUD RO1HGZ42AJ8S23 of 85 models qualify · AHRI 207590035
Ducted, 5 tons and up	None on this board (0 of 13 models qualify)	None on this board (0 of 17 models qualify)
Non-ducted, up to 1.5 tons	90.2(50 is the typical model of its size class)MPC009S4S-1Pwith ductless indoor unit MWMC006S4-2P34 of 66 models qualify · AHRI 213199199	95.0(50 is the typical model of its size class) (higher)RO1HGZ15AJ1Swith ductless indoor unit UIWHGZ15AJ1S45 of 59 models qualify · AHRI 210368107
Non-ducted, 2 tons	86.1(50 is the typical model of its size class)MLB024S4S-1Pwith ductless indoor unit M33C024S4-1PAlso sold as Comfort-Aire A-VMH24SV-114 of 22 models qualify · AHRI 207683534	87.3(50 is the typical model of its size class) (higher)RO1HHZ24AJ2Swith ductless indoor unit UIWHHZ24AJ2S10 of 12 models qualify · AHRI 210368117
Non-ducted, 2.5–3 tons	90.9(50 is the typical model of its size class) (higher)A-VMH36QV-1A12 of 37 models qualify · AHRI 214377756	89.6(50 is the typical model of its size class)RO1HHZ30AJ8Swith ductless indoor unit RIGHHZ30AJ8S15 of 20 models qualify · AHRI 211781745
Non-ducted, 3.5–4.5 tons	81.3(50 is the typical model of its size class) (higher)MLB048S4S-2Pwith ductless indoor unit M33C048S4-*P8 of 16 models qualify · AHRI 211034460	75.3(50 is the typical model of its size class)ROSH42VGSNwith ductless indoor unit RICH42AXCJAlso sold as RUUD UOSH42VGSN; also listed as RO1HGZ42AJ8S5 of 8 models qualify · AHRI 202245810
Non-ducted, 5 tons and up	None on this board (0 of 1 models qualify)	No models in this size class

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	LennoxAll-around score, best model	RheemAll-around score, best model
Ducted, up to 1.5 tons	85.6(50 is the typical model of its size class) (higher)MLB009S4S-1Pwith ducted air handler MMDB009S4-2P30 of 31 models have all five ratings · AHRI 207683524	82.7(50 is the typical model of its size class)RO1HHZ12AJ8Swith ducted air handler RIMHHZ12AJ8S24 of 25 models have all five ratings · AHRI 210824724
Ducted, 2 tons	84.1(50 is the typical model of its size class) (higher)EL22XPV-024-230Awith ducted air handler CBK47UHET-030-230-0Also sold as Armstrong Air 4SHP22LX124P-A29 of 35 models have all five ratings · AHRI 214861258	83.6(50 is the typical model of its size class)RP18AZ24AJVCwith indoor coil RCFZ2421HEAAM and furnace R98VB085M521U28 of 31 models have all five ratings · AHRI 213163975
Ducted, 2.5–3 tons	83.7(50 is the typical model of its size class)A-VMH36QV-1A47 of 69 models have all five ratings · AHRI 214377757	87.2(50 is the typical model of its size class) (higher)UP18AZ36AJVCwith indoor coil RCFZ6021SEAAM and furnace U802VA075317M44 of 65 models have all five ratings · AHRI 210589396
Ducted, 3.5–4.5 tons	87.7(50 is the typical model of its size class) (higher)SL25XPV-048-230A*with ducted air handler CBA38MV-048-230+TDR49 of 84 models have all five ratings · AHRI 207436541	81.5(50 is the typical model of its size class)RP18AZ48AJVCwith ducted air handler RHMVZ6021SEACA46 of 84 models have all five ratings · AHRI 208552859
Ducted, 5 tons and up	68.9(50 is the typical model of its size class)4HP17L60P-**Awith ducted air handler L(E,G)M60H412 of 18 models have all five ratings · AHRI 212431768	70.9(50 is the typical model of its size class) (higher)RP15AZ60AJ2Nwith ducted air handler V,R60H210P309+AEFE5Also listed as WP15AZ60AJ2N5 of 18 models have all five ratings · AHRI 213088753
Non-ducted, up to 1.5 tons	92.4(50 is the typical model of its size class)MPC009S4S-1Pwith ductless indoor unit MWMC006S4-2P59 of 66 models have all five ratings · AHRI 213199199	96.4(50 is the typical model of its size class) (higher)RO1HGZ09AJ1Swith ductless indoor unit UIWHGZ09AJ1S49 of 59 models have all five ratings · AHRI 210368099
Non-ducted, 2 tons	84.3(50 is the typical model of its size class)MLB024S4S-1Pwith ductless indoor unit MWMC024S4-1PAlso sold as Comfort-Aire A-VMH24SV-1, Comfort-Aire A-VMH24SU-1, Comfort-Aire A-KMH24SU-120 of 22 models have all five ratings · AHRI 207683523	86.5(50 is the typical model of its size class) (higher)RO1HHZ24AJ8Swith ductless indoor unit RIGHHZ24AJ8S12 of 12 models have all five ratings · AHRI 211781744
Non-ducted, 2.5–3 tons	86.4(50 is the typical model of its size class) (higher)A-VMH36QV-1A27 of 37 models have all five ratings · AHRI 214377756	79.2(50 is the typical model of its size class)UOMH36FXZHJAlso listed as ROMH36FXZHJ, RO4HFZ36AJ1H19 of 20 models have all five ratings · AHRI 10595431
Non-ducted, 3.5–4.5 tons	77.9(50 is the typical model of its size class) (higher)MLB048S4M-2PAlso sold as Comfort-Aire A-VMH48PV-1, Allied 4DHP2S48M-1P11 of 16 models have all five ratings · AHRI 207699107	65.1(50 is the typical model of its size class)ROSH42VGSNwith ductless indoor unit RICH42AXCJAlso sold as RUUD UOSH42VGSN; also listed as RO1HGZ42AJ8S8 of 8 models have all five ratings · AHRI 202245810
Non-ducted, 5 tons and up	36.2(50 is the typical model of its size class)GMV-60WL/C-T(U)1 of 1 models have all five ratings · AHRI 214728288	No models in this size class

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	Lennox	Rheem
COP at 5°F	beats 100% · 3.194HP18V36PDucted, 2 tons	beats 100% · 3.15RP15AZ24AJ2NDucted, 2 tons
Capacity retention at 5°F	beats 100% · 147%4HP17L18P-**ADucted, up to 1.5 tons	beats 100% · 149%ROSH09AFFHJNon-ducted, up to 1.5 tons
HSPF2	beats 99% · 10.3MLB048S4S-1PDucted, 3.5–4.5 tons	beats 98% · 13.4RO1HGZ09AJ1SNon-ducted, up to 1.5 tons
SEER2	beats 100% · 21.8SL25XPV-048-230A**Ducted, 3.5–4.5 tons	beats 100% · 33.1RO1HGZ09AJ1SNon-ducted, up to 1.5 tons
EER2	beats 100% · 15.0SL25XPV-024-230A**Ducted, 2 tons	beats 100% · 18.0RO1HGZ09AJ1SNon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 100% · 42,926 Btu/hMLB036S4S-2PNon-ducted, 2.5–3 tons	beats 100% · 43,500 Btu/hRP18AZ36AJVCAlso sold as RUUD UP18AZ36AJVCDucted, 2.5–3 tons

More comparisons

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Lennox vs Rheem heat pumps