the invention is a device to maintain a continuous volume and pressure in a freon operated air conditioning unit . outside ambient temperature is used as a baseline for the on / off switch . vital components include a 110 volt to 24 volt transformer , a pair of electromechanical operated solenoid valve , a pressure and volume gauge , a compressor , and a timer . all devices are connected to a freon tank - operated air conditioning unit and can be instituted into either enclosed structure or automotive air conditioning systems .