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| US3986664 | 10 apr 1975 | 19 okt 1976 | Projectus Industriprodukter AB | Heating installation comprising a heat pump and a fuel-fired boiler with a radiator circuit |
| US4041726 | 29 mar 1976 | 16 aug 1977 | Paul Mueller Company | Hot water system |
| US4142379 | 16 aug 1976 | 6 mar 1979 | | Waste energy recovery system |
| US4249390 | 23 aug 1979 | 10 feb 1981 | | Air conditioning system |
| US4293093 | 25 okt 1979 | 6 okt 1981 | Carrier Corporation | Co-axial fitting for use with a refrigeration circuit heat reclaim apparatus |
| US4315597 | 2 maj 1977 | 16 feb 1982 | | Water pre-heater of a refrigeration system |
| US4325226 | 18 feb 1981 | 20 apr 1982 | Frick Company | Refrigeration system condenser heat recovery at higher temperature than normal condensing temperature |
| US4402189 | 12 nov 1981 | 6 sep 1983 | Frick Company | Refrigeration system condenser heat recovery at higher temperature than normal condensing temperature |
| US4407142 | 22 sep 1981 | 4 okt 1983 | Hall & Kay Engineering Limited | Heat recovery |
| US4517807 | 14 aug 1984 | 21 maj 1985 | Borg-Warner Corporation | Heat pump water heater with supplemental heat supply |
| US4645908 | 27 jul 1984 | 24 feb 1987 | UHR Corporation | Residential heating, cooling and energy management system |
| US4680941 | 21 maj 1986 | 21 jul 1987 | | Waste heating recovery system |
| US6213199 | 19 apr 1999 | 10 apr 2001 | | Temperature selectable water supply device |
| US6708511 | 13 aug 2002 | 23 mar 2004 | Delaware Capital Formation, Inc. | Cooling device with subcooling system |
| US7603872 | 26 jan 2006 | 20 okt 2009 | Hitachi Appliances, Inc. | Heat-pump hot water supply apparatus |
| US7934664 | 26 okt 2007 | 3 maj 2011 | | Hydronic space and water heater |
