![]() ![]() Its goal is to provide thermal comfort and acceptable indoor air quality. ![]() Heating, ventilation, and air conditioning ( HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. The safety interlock switch is at the bottom left. ![]() The fan enclosure is directly behind the board, and the filters can be seen at the top. The wires connecting to the blue terminal block on the upper-right of the board lead to the thermostat. The control circuit in a household HVAC installation. In the middle is a damper to open and close the vent to allow more or less air to enter the space. These are installed throughout a building to move air in or out of rooms. Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. The term may also refer to high-voltage alternating current. ![]()
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