1. a device that automatically controls temperature by switching heating or cooling equipment on and off

1. to control the temperature of something using a thermostat

Examples

• Set the thermostat to 72 degrees before you leave.
• The thermostat automatically turns on the heat when the room gets cold.
• Our programmable thermostat saves energy by lowering the temperature at night.
• The car’s thermostat regulates the engine temperature.
• She adjusted the thermostat to make the house more comfortable.
• The broken thermostat caused the air conditioner to run constantly.
• Modern thermostats can be controlled remotely through smartphone apps.