Heating, Ventilation and Air Conditioning is an all-seasons profession. Workers in these areas install, maintain, and repair home heating and central air conditioning systems, as well as domestic water, heating, humidification, and air cleaning equipment. HVAC technicians diagnose problems and make repairs. They must follow blueprints, design specifications, and manufacturers’ instructions to install parts. They install compressors, condensing units, evaporators, piping, and other components. The also use a variety of tools including hammers, wrenches, metal snips, electric drills, pipe cutters and benders, and torches.