The acronym HVAC stands for heating, air flow, and air conditioning. It’s a collective term for all the different types of cooling and heating systems homeowners use to change the temperature and humidity indoors. By Chauncey Crail Chauncey Crail Contributor Chauncey grew up over a farm in rural northern California. https://ductworkinstallers45567.webbuzzfeed.com/30636154/new-step-by-step-map-for-specialists-in-ductwork