What is typically the main function of temperature sensors in HVAC systems?

The main function of temperature sensors in HVAC systems is to indicate air temperature. These sensors play a critical role in maintaining comfortable indoor environments by accurately measuring the temperature of the air within the space. This data is essential for the HVAC control system to operate effectively; it ensures that heating or cooling systems are activated or adjusted as necessary to maintain the desired temperature setpoint.

Temperature sensors can be found in various locations throughout the HVAC system, such as in the air handling units or directly within the occupied spaces. By providing real-time temperature readings, they enable precise monitoring and control, ensuring energy efficiency and comfort for occupants.

In contrast to the other choices, temperature sensors do not directly measure humidity levels, control fan speed, or measure air velocity, although temperature data may indirectly influence these factors by affecting overall system performance and response.