Mammoth heat pumps

2 certified models, ranked by seasonal cooling efficiency (SEER2), then heating efficiency (HSPF2), highest first.

1 GXH48-60MSK4DHAireForce, Airtemp + 5 more
48,000 Btu/hheating at 47°F 48,000 Btu/hcooling at 95°F
48,000 Btu (4-ton) · Central · 5°F 39,000 Btu/h · Cold output 76–81% · HSPF2 9.0 · 14 pairings
2 GXH24-36MSK4DHAireForce, Airtemp + 5 more
24,000 Btu/hheating at 47°F 24,000 Btu/hcooling at 95°F
24,000 Btu (2-ton) · Central · 5°F 22,000 Btu/h · Cold output 80–92% · HSPF2 9.0 · 14 pairings

Mammoth heat pumps, ranked by seasonal cooling efficiency (SEER2), then heating efficiency (HSPF2)
#	Model	Brands	Type	Size	At 5°FBtu/h · heating	At 47°FBtu/h · heating	At 95°FBtu/h · cooling	Cold output% of 47°F rating	COP 5°Ffull speed	SEER2median pairing	HSPF2Btu/Wh · median pairing	Compressor	Refrigerant	Market	Pairings
1	GXH48-60MSK4DH	AireForce, Airtemp + 5 more	Central	48,000 Btu (4-ton)	39,000	48,000	48,000	76–81%	1.80	16.5	9.0	Variable	R-410A	US CA	14
2	GXH24-36MSK4DH	AireForce, Airtemp + 5 more	Central	24,000 Btu (2-ton)	22,000	24,000	24,000	80–92%	1.80	16.5	9.0	Variable	R-410A	US CA	14

The share is heat output at 5°F divided by the 47°F rating. Tests use different compressor speeds.

2 of 2 units

Other sizes

Every size class, with how many units it holds and its median heat output at 5°F