What role do thermostats play in HVAC systems?

Thermostats play a crucial role in HVAC systems primarily by controlling the heating and cooling cycles. They monitor the temperature of the space and compare it to the setpoint that the user has programmed. When the temperature deviates from this setpoint, the thermostat sends signals to the HVAC system to activate or deactivate heating or cooling as needed. This not only ensures comfort for the occupants of the building but also promotes energy efficiency by preventing unnecessary operation of the heating or cooling equipment.

In contrast, filtering contaminants from the air is a function typically performed by air filters within the HVAC system. Air distribution is handled by blowers and ductwork, which transport conditioned air throughout the building. Measuring outside temperature can be done by a different type of sensor and does not represent the primary function of a thermostat, which focuses on indoor climate control. Thus, the thermostat's capability to manage heating and cooling cycles is imperative for the overall operation and effectiveness of HVAC systems.