As an HVAC engineer, your job is to design heating, ventilation, air conditioning, and cooling (HVAC) systems, as well as refrigeration systems. Your primary responsibilities center around the design of these systems, but depending on your employer, you may also have installation, maintenance, and repair duties. You must consult with clients, whether residential or commercial, to discover their needs, and then provide them with an estimate. From there, you either create a design for a new HVAC system or identify solutions for their existing system. You may collaborate with other engineers as well as installers, repair technicians, and managers to make sure your designs are within the scope of the project budget and meet clients’ needs.