What is the definition of a temp probe HVAC? A temp probe HVAC is a type of HVAC (heating, ventilation, and air conditioning) unit that is designed to measure the temperature of the air in a given area. It operates by using a thermocouple, which is a device that measures the temperature of an object by measuring the voltage created by the junction of two different metals. The temp probe HVACHVAC unit is connected to the HVAC system, and records the temperature readings over a period of time. These readings are then used to determine the efficiency of the HVAC system, as well as to detect any changes in temperature that may indicate a problem. The temp probe HVACHVAC unit is a valuable tool for HVAC technicians, as it can help them to diagnose and correct any issues they may be having with the system.