HVAC AC motors are used in equipment such as fans, blowers, pumps, air conditioners, heaters, and compressors. Direct drive blower and belt drive HVAC AC motors circulate air in roof ventilators and air circulators. Room air conditioner AC motors circulate cool air generated by room air conditioners while water circulator AC motors provide power to hot water circulation pumps. Unit heater AC motors power fans that circulate heat out of the heater and into the room. Draft booster AC motors are used to clear out any lingering combustion gases in gas furnace applications while transformer cooling fan AC motors power fans to cool electrical transformers.