Founded in 1933, Heat Controller offers a range of residential and light commercial heating and air conditioning equipment. The company serves clients in the United States and Canada. It manufactures coal-, oil-, and gas-fired furnaces and split system condensing units. Heat Controller provides residential furnaces, room air conditioners, heat pumps and central air conditioning systems. The company also offers air handlers, dehumidifiers, package equipment and patio coolers. It provides products under the brand names of Century and Comfort-Aire. Heat Controller operates Aitons Equipment.