Abstract: A malfunction detection apparatus is provided for a heat pump system incorporating auxiliary resistance heaters, for detecting when the heat pump has lost efficiency, due to less than a catastrophic failure, and is therefore energizing the resistance heaters when they would not normally be energized, whereby a signal may be provided, such as a warning light, for announcing when the resistance heater has been energized while the outside temperature is above the system balance point.

Abstract: A supplemental energy register in which successive increments of consumed electrical energy are detected at a kilowatthour meter, and are translated into electrical pulse signals. Digital calculation and display logic is operated by the pulses, either directly or through intermediate transmission over the household network. Kilowatthours are directly accumulated in increments corresponding to those sensed at the meter, while net cost is computed by chain addition utilizing the prevailing cost per increment rate, which is maintained in a keyboard controllable memory. The register may desirably be inserted in the leads connecting an electric utilization device to the local common network.

Abstract: A supplemental energy register in which successive increments of consumed electrical energy are detected at a kilowatthour meter, and are translated into electrical pulse signals. Digital calculation and display logic is operated by the pulses, either directly or through intermediate transmission over the household network. Kilowatthours are directly accumulated in increments corresponding to those sensed at the meter, while net cost is computed by chain addition utilizing the prevailing cost per increment rate, which is maintained in a keyboard controllable memory. The register may desirably be inserted in the leads connecting an electric utilization device to the local common network.