Air Conditioner The air conditioner is designed to keep you cool on those hot summer days. The air conditioner turns Freon gas into pressurized, hot gas. The gas then makes its way around several coils to cool down and turn into a liquid. After this, the liquid moves through a valve, evaporating into a low-pressure, cold gas, which then runs through more coils, allowing the freon to absorb hot air and create cool air.