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A residential HVAC system includes a heat pump having a compressor arranged to heat a domestic hot water vessel and to heat or cool a storage vessel which is connected to a heat exchanger within the residence. Temperature sensors are provided at critical locations throughout the system and current a

A residential HVAC system includes a heat pump having a compressor arranged to heat a domestic hot water vessel and to heat or cool a storage vessel which is connected to a heat exchanger within the residence. Temperature sensors are provided at critical locations throughout the system and current and voltage sensors are coupled to the power lines feeding the residence. A microprocessor controls the operation of the compressor and other components of the heat pump system in response to measured temperatures, in response to the level of energy supplied to the residence and in response to the existence of on- or off-peak time intervals to operate the compressor and/or resistive heating elements to condition the hot water and storage vessels for subsequent use and to control an interior fan to condition the space. Operation of the compressor is controlled during on-peak intervals as a function of the resident\s life style as reflected in power usage and requested comfort level.

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A method of controlling a space conditioning system to modify the temperature of a space within a structure wherein the system includes a thermal storage mass, means for selectively transferring heat between the storage mass and the ambient atmosphere, and means for selectively transferring heat bet

A method of controlling a space conditioning system to modify the temperature of a space within a structure wherein the system includes a thermal storage mass, means for selectively transferring heat between the storage mass and the ambient atmosphere, and means for selectively transferring heat between the storage mass and the space, the method comprising the steps of establishing a set point temperature at which the space is to be maintained, establishing a temperature range within which the thermal storage mass temperature is to be maintained to permit conditioning of the space using the thermal storage mass, conditioning the thermal storage mass by transferring heat between the storage mass and the ambient atmosphere whenever the temperature of the storage mass degrades beyond the established range, investigating the temperature of the space at selected times, and conditioning the space by transferring heat between the thermal storage mass and the space when the temperature of the space differs from the set point by a selected amount without regard to whether the space conditioning time is during an on-peak or off-peak interval.