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The device that is typically used to regulate the temperature in an apartment is a thermostat. A thermostat acts as a control system that monitors the ambient temperature within a space and adjusts heating or cooling systems accordingly to maintain a desired temperature set point. When the temperature deviates from the desired level, the thermostat sends a signal to either turn on or off the heating or cooling system, ensuring that the internal environment remains comfortable for residents.

The other devices mentioned, while integral to heating and cooling systems, serve different functions. A compressor is responsible for compressing refrigerant in a cooling system, enabling the cycle of converting low-pressure gas to high-pressure gas. A condenser’s role involves releasing heat from the refrigerant after it has been compressed, while an evaporator is where the refrigerant absorbs heat to cool the air. These components are essential for the proper operation of air conditioning or heating units, but they do not directly regulate temperature in the way a thermostat does.