Control for dual heating system including a heat pump and furnace
US5259445A · kind A · utility
171Cited by
15References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1992 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Jul 13, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24D19/1039
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A programmable thermostat is provided for the selective operation either of a fossil fuel furnace or a heat pump. The thermostat is programmed to operate the fossil fuel furnace when the outside temperature is below a preselected temperature range, and to operate the heat pump when the outside temperature is above the preselected temperature range. Within the preselected temperature range, the fossil fuel furnace may be operated during certain time periods and the heat pump may be operated during other time periods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.