A wireless connection between an air conditioning unit or heat pump condenser and a split system furnace or air handler where the furnace or air handler is in the structure and the air conditioning condensing unit or heat pump condenser are external to the structure, and a thermostat in the structure which controls the air conditioning or heat pump unit. In this way, when a cooling signal from a thermostat goes out, the circuit board is energized and turns on the air conditioning or heat pump portion of the air conditioning unit which is wired internally to the compressor so that cooling or heating in the structure occurs. The wireless circuit board eliminates the need for having the hard wired communication between the furnace or air handler and the air conditioning condenser or the heat pump condenser.