Mentor and support all levels of heating, ventilation, and air-conditioning (HVAC) technicians in the installation, maintenance, repair, replacement, and preventative maintenance of HVAC equipment, refrigeration equipment/systems, and cold rooms; perform the same independently. Troubleshoot field-connected devices (including unitary controllers, variable air volume (VAV) controllers, electronic and pneumatic thermostats, and control programs related to field devices operating HVAC equipment) with network computers.