Abstract: The Automatic HVAC Energy Saver Control Unit (HVAC-ES) is composed of 4 components. The Control System includes 2 wireless contacts, 1 transformer, and 1 control keypad. The Relay opens and closes the circuit. The Timer determines when the Relay engages and had dip switches and a timer dial that allows the delay to be set in seconds, minutes, or hours. The Cover encloses the Relay and Timer. The HVAC-ES operates when a door or window fitted with the wireless contacts is left open beyond the programmed time. At that point, the relay engages and shuts off the power to the HVAC unit. Once the door or window is closed the relay disengages and the power to the HVAC unit is restored. The HVAC-ES is connected to the power wires between the thermostatic control and the HVAC unit.