HVAC stands for heating, ventilation, and air conditioning. As an HVAC controls technician, you work with the devices that control these heating and cooling systems. You may install new HVAC controls or repair existing units. Your duties include installing panels and the wiring that connects them to the HVAC system, thermostats, and other sensors. In many cases, your job involves working with computers to automate the climate control process. In these cases, installation can include setting up and configuring programmable logic controllers (PLCs). You use specialized software, such as Niagara WorkBench, to set up an automated system.