A Navy HVAC job involves installing, maintaining, and repairing heating, ventilation, air conditioning, and refrigeration (HVAC/R) systems aboard ships, submarines, and shore facilities. Technicians ensure proper climate control for mission-critical equipment, personnel comfort, and food preservation. They work with electrical, mechanical, and pneumatic systems, often troubleshooting and making repairs in demanding environments. Training includes mechanical systems, refrigeration cycles, and environmental controls.