Air-conditioning, heating and ventilation equipment and parts, namely, air-conditioners, heat pumps, warm air furnaces, gas and oil heaters composed primarily of flame to air heat exchanger, pressure regulator, solenoid valve, air blower, cabinet where cold air flowing through the hot heater exchanger is being warmed up, evaporative coolers, air humidifiers, and dehumidifiers, air cleaners, air handlers comprised primarily of coolant to air heat exchanger, contractor, air blower, cabinet where warm air flowing through the cold heat exchanger is being cooled down, all used to control temperature and humidity and all for residential and commercial applications