A commercial AC thermostat is a device used to regulate the temperature of an air conditioning system. It is typically used in commercial buildings, such as offices, retail stores, and warehouses, to maintain a comfortable temperature for occupants. The thermostat works by measuring the ambient temperature and then adjusting the air conditioning system to maintain the desired temperature. It can be programmed to turn the air conditioning system on and off at certain times of the day, as well as to adjust the temperature as needed. Commercial AC thermostats are typically more advanced than residential thermostats, offering more features and control options. They are also more expensive, as they are designed to withstand the higher temperatures and demands of a commercial environment.