Breadcrumb Home/ Interplay Learning - What is HVAC?/ What is HVAC? What is HVAC? Duration 1 hour 0 minutes Language English Are you new to the HVAC industry? This course is a great place to start. It covers general information on the industry, systems and components, and explains how an HVAC system heats and cools a house. Back to Course Title Interplay Learning - What is HVAC?