They check airflow, refrigerant pressure, electrical circuits, burners, and other components. Furnace installers are also known as heating equipment technicians. They follow blueprints to install heating systems. Installers may install fuel and water supply lines, air ducts and vents, pumps, and other components. They may connect electrical wiring and controls and check the unit to make sure it works.
Mechanics do routine maintenance and repair work to keep installed furnaces in order.
They do maintenance work. This involves replacing filters, vacuum-cleaning vents, ducts, and other parts of the system. Refrigeration systems are used for many purposes. They make it possible to store and transport medicine, food, and other items that must be kept cool. Mechanics follow blueprints and instructions.