thermostat
n. countablen. a small device that controls the temperature in a room or a machine. It automatically turns the heating or cooling on and off to keep the air at the level you choose.
n. an instrument that monitors and regulates the temperature of a system, typically by activating or deactivating heating and cooling components. It maintains a set point by responding to thermal changes in the environment.
Please turn down the thermostat if the room gets too hot.
Modern smart homes allow you to adjust the thermostat from your phone before you even arrive at the house.
The industrial cooling system relies on a highly sensitive digital thermostat to ensure that the chemical reagents remain stable within a very narrow temperature range.
From thermo- + -stat.
Commonly used with verbs like 'set', 'adjust', or 'turn up/down'.