Abstract: An air conditioning system for a building including an air conditioner, a thermostat for controlling operation of the air conditioner, and alternating current electrical control means including circuitry for effectively maintaining operation of the air conditioner and wherein said system comprises a relay including a switch normally closed in the absence of adverse presence of water, at least one water sensor functioning as a switch in the presence of water, and a triac including first and second terminals and a gate, said triac preventing flow of current to the relay and permitting flow of current when the gate of the triac receives flow of an electrical current.