What is the definition of a wall thermostat? A wall thermostat is a device that is used to control the temperature of a room or space. It is typically mounted on a wall and consists of a dial or switch that can be adjusted to increase or decrease the temperature of the area. The thermostat is connected to an air conditioning or heating system, and when the desired temperature is reached, it will turn the system on or off. Wall thermostats are commonly found in homes, offices, and other indoor spaces. A wall thermostat can be used to maintain comfortable temperatures throughout the year, while also helping to save energy. They can also be used to reduce humidity levels, improve air quality, and even to adjust fan speeds. Wall thermostats are typically programmable, allowing users to set specific temperatures during different times of day. With the right settings, a wall thermostat can help to save energy while also ensuring that a space is comfortable and safe.