MARATHERM heat pumps

23 ENERGY STAR certified MARATHERM outdoor units (15 central, 8 packaged). The most efficient is the N5H8T24*K*AAA at 18.5 SEER2 and 8.5 HSPF2.

Some of these units are also certified under Airquest, Arcoaire, Comfortmaker, Day & Night, Keeprite, Tempstar, Kenmore, ACIQ.

ENERGY STAR data, updated October 12, 2026

23 models, ranked by SEER2 (cooling efficiency), then HSPF2.

#		Type						Cold
1	MARATHERM N5H8T24KAAA2-STAGE 18 SEER HP	Central	2-ton	18.5	14.0	8.5	11,500	No	4839
2	MARATHERM N5H8T48KAAA2-STAGE 18 SEER HP	Central	4-ton	18.0	13.0	8.5	26,600	No	3888
3	MARATHERM N5H8T60KAAA2-STAGE 18 SEER HP	Central	5-ton	17.5	13.0	8.5	31,800	No	1164
4	MARATHERM N5H8T36KAAA2-STAGE 18 SEER HP	Central	3-ton	17.0	13.0	8.5	19,600	No	2449
5	MARATHERM R5H5S24KAAA15 SEER2 HP	Central	2-ton	16.5	13.0	8.5	11,900	No	1988
6	MARATHERM N5H5S24KAAAPERFORMANCE 16 SEER2 HP	Central	2-ton	16.5	13.0	8.5	11,900	No	1985
7	MARATHERM R5H5S19KAAA15 SEER2 HP	Central	1.5-ton	16.0	13.0	8.0	8,500	No	749
8	MARATHERM R5H5S36KAAA15 SEER2 HP	Central	3-ton	16.0	13.0	8.0	18,100	No	312
9	MARATHERM R5H5S31KAAA15 SEER2 HP	Central	2.5-ton	16.0	13.0	8.0	14,000	No	382
10	MARATHERM N5H5S18KAAAPERFORMANCE 16 SEER2 HP	Central	1.5-ton	15.5	12.5	8.0	8,600	No	505
11	MARATHERM N5H5S42KAAAPERFORMANCE 16 SEER2 HP	Central	3.5-ton	15.5	13.0	7.8	19,900	No	43
12	MARATHERM N5H5S48KAAAPERFORMANCE 16 SEER2 HP	Central	4-ton	15.5	12.0	7.8	24,400	No	53
13	MARATHERM PHB560000K000BQuiet Comfort HP	Packaged	5-ton	15.5	11.5	7.7	25,800	No	11
14	MARATHERM PHR536000K***K1Quiet Comfort HP	Packaged	3-ton	15.5	12.0	7.2	12,700	No	11
15	MARATHERM PHR548000K***K1Quiet Comfort HP	Packaged	4-ton	15.5	11.5	7.2	18,200	No	11
16	MARATHERM N5H5S30KAAAPERFORMANCE 16 SEER2 HP	Central	2.5-ton	15.2	12.0	8.1	13,900	No	64
17	MARATHERM N5H5S60KAAAPERFORMANCE 16 SEER2 HP	Central	5-ton	15.2	12.5	7.8	28,600	No	11
18	MARATHERM R4H5S30KAAAPERFORMANCE 15 SEER2 HP	Central	2.5-ton	15.2	12.5	7.8	12,900	No	11
19	MARATHERM PHR560000K***K1Quiet Comfort HP	Packaged	5-ton	15.2	11.5	7.5	22,200	No	11
20	MARATHERM PHR524000K***K1Quiet Comfort HP	Packaged	2-ton	15.2	11.5	7.2	8,600	No	11
21	MARATHERM PHB524000K000BQuiet Comfort HP	Packaged	2-ton	15.2	11.5	7.2	8,400	No	11
22	MARATHERM PHB548000K000BQuiet Comfort HP	Packaged	4-ton	15.2	11.5	7.2	18,200	No	11
23	MARATHERM PHB536000K000BQuiet Comfort HP	Packaged	3-ton	15.2	11.5	7.2	14,100	No	11