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HVAC (pronounced either "H-V-A-C" or, occasionally, "H-VAK") is an initialism/acronym that stands for "heating, ventilating and air-conditioning". This is sometimes referred to as climate control.

These three functions are closely interrelated, as they control the temperature and humidity of the air within a building in addition to providing for smoke control, maintaining pressure relationships between spaces, and providing fresh air for occupants. In modern building designs, the design, installation and control systems of these functions are integrated into a single "HVAC" system.

In certain regions (e. g. Suite 408. , UK), the term "Building Services" is also used and HVAC Engineers are called Building Services Engineers. See CIBSE.

The term air handler can mean a whole unit including the blower, heating and cooling elements, filter racks or chamber and dampers, but not including the ductwork through the building.

Heating

Heating systems may be classified as central or local.

Central heating

Central heating is often used in cold climates to heat private houses and public buildings. Such a system contains a central boiler, furnace or heat pump to heat water, steam, or air; piping or ductwork to distribute the heated fluid, and radiators to transfer this heat to the air. NULIGHT SOLUTIONS INTRODUCES REDESIGNED FAN-ATTIC.