install and use a room thermostat that requires an additional c wire despite the fact that only two wires are available the white wire is repurposed to act as a c wire thus providing a return path for current which completes the circuit and provides power to operate a thermostat requiring a c wire the thermostat sensor transmitter unit 2 will transmit the appropriate signal wirelessly to the furnace receiver which activates the appropriate furnace function furnace on high speed blower low speed blower etc in essence the wireless transmission in combination with a relay replace the function of the white wire allowing it to be repurposed to a c wire fig2 shows a front section view of the transmitter unit 2 of the present invention and its 39 major components these include power circuit 12 microprocessor 7 conversion circuit 8 wireless transmitter 9 wireless receiver 10 and various switches toggle rocker 13 dip 14 etc and led 39 s 15 a transceiver 11 may be substituted for the separate wireless transmitter 9 and wireless receiver 10 these and other minor components are housed in an enclosure 2 fig3 shows a front section view of the receiver unit 3 of the present invention and its 39 major components these include power circuit 21 microprocessor 16 conversion circuit 17 wireless transmitter 18 wireless receiver 19 and various switches toggle rocker 22 dip 23 etc relays 24 and led 39 s 25 a radio transceiver 20 may be substituted for the separate wireless transmitter 18 and wireless receiver 19 the number of.