HVAC Excellence Electric Heat ESCO Practice Exam

A contactor is an essential component in electric heating systems, primarily functioning to control the flow of electricity to the heating elements. When the thermostat detects that additional heat is necessary, it sends a signal to the contactor, which then closes the circuit and allows electric current to flow to the heating elements. This activation is crucial for the efficient operation of the heating system, enabling the elements to generate the necessary heat to warm the space.

In contrast, measuring indoor temperature is the job of the thermostat, while controlling airflow is managed by blower motors or fans in the system. Maintaining humidity levels is typically handled by a separate component, such as a humidistat or a dehumidification system. Each of these functions is important in ensuring a comfortable indoor environment, but it is the contactor that specifically regulates the electrical supply to the heating elements, making it a vital accessory in electric heating systems.