Nate Core Practice Test 2026 - Free Practice Questions and Study Guide

The purpose of a thermostat in an HVAC system is to regulate the temperature by controlling the operation of heating and cooling equipment. A thermostat functions as a temperature control device that senses the current temperature in a space and compares it to the setpoint— the desired temperature set by the user.

When the indoor temperature deviates from this desired level, the thermostat sends signals to the HVAC system to either turn on the heating or cooling equipment to bring the environment back to the setpoint. This process ensures comfort and efficiency within the living space by maintaining a consistent temperature.

Monitoring outdoor temperatures, regulating humidity levels, and measuring indoor air quality are functions associated with other components or systems within an HVAC setup, but they do not describe the primary function of a thermostat. Thus, the focus remains on its role in controlling temperature to achieve desired comfort levels effectively.