HVAC Freeze Stat is an official business term that refers to a type of safety device designed to protect heating, ventilation, and air conditioning (HVAC) systems from freezing. The Freeze Stat works by preventing the temperature in the HVAC system from dropping below a certain low level. If the temperature drops too low, the stat triggers a switch that shuts off the flow of coolant to protect equipment from harm. By deploying a Freeze Stat to guard against extreme cold, businesses can ensure their HVAC systems are always functioning optimally—even during frigid winter weather.