A mechanical engineer specializing in heating, ventilation, and air-conditioning (HVAC) is called an HVAC mechanical engineer. The engineer oversees the design, installation, and operation of systems that heat, cool, and ventilate indoor spaces. An HVAC mechanical engineer typically has mechanical, electrical, and plumbing expertise and is familiar with building codes.

An HVAC mechanical engineer optimizes indoor air quality by controlling temperature and air flow in a building, a complex of buildings, or a single room. Heating and cooling systems make indoor spaces more comfortable. Ventilating equipment keeps air from becoming stale and removes odors.

Engineers commonly plan new projects for their clients. This means creating a step-by-step sequence of all the tasks needed to accomplish a project. For example, an HVAC mechanical engineer might develop a plan for designing and installing a new HVAC system.

An HVAC mechanical engineer manages equipment installation to ensure that the equipment is placed and connected in accordance with the design plan. Performance tests are conducted to confirm the new system operates properly. The engineer also develops a schedule for regular maintenance of the HVAC equipment.