Installing, maintaining, and repairing ventilation and air conditioning systems and equipment. Identifying maintenance risks on equipment. Diagnosing electrical and mechanical faults for HVAC systems. Cleaning, adjusting, and repairing systems, and performing warranty services. Assisting with the installation of HVAC systems on commercial and residential properties. Installing, maintaining, and repairing roof units for heating and air conditioning as well as the units inside residential and commercial buildings. Operating a variety of hand and power tools needed for HVAC installation.