How Window Air Conditioner (AC) Works? Working of Window AC For understanding the working of the window AC please refer the figures given below. The working of window air conditioner can be explained by separately considering the two cycles of air: room air cycle and the hot air cycle. The compartments of the room and hot air are separated by an insulated partition inside the body of the air conditioner.Author: Haresh Khemani Electrical Requirements for Window Air Conditioners Circuit breakers protect the size of the cable in the circuit. 15 amp breaker for 14 gauge cable and 20 amp for 12 gauge. You cannot increase the breaker without replacing the wiring. 10 gauge cable is good for 30 amps.