N / a. What I discovered was -. HVAC (pronounced either "HVAC" 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 the control temperature and humidity in a building along with providing for smoke control, maintain pressure relationships between spaces and provide fresh air for the occupants. Designs in modern construction, installation, control systems and design of these functions are integrated into a single "HVAC system." In some regions (EG, United Kingdom), the term "Building Services" is also used and HVAC Engineers named Building Services Engineers. See CIBSE . Term air controller can mean a complete unit that includes the elements blowing, heating and cooling, filter racks or chamber and shock absorbers, but not including passage through the building.