What is the purpose of controls in heat pumps that utilize electric resistance heaters?

The purpose of controls in heat pumps that utilize electric resistance heaters is primarily to keep the heaters off when they are not needed. This function is essential for managing energy consumption and ensuring that the system operates efficiently. When the temperature outside is relatively mild, the heat pump can draw heat from the environment without needing to activate the electric resistance heaters, which can be significantly less efficient than the heat pump's primary operation.

By utilizing controls to monitor the temperature and the heating needs of the space, the system can avoid unnecessary use of the electric resistance heaters. This not only helps in reducing energy bills but also prolongs the lifespan of the heating system by minimizing wear and tear from excessive use. This intelligent management of heating elements is crucial, especially in climates where temperatures can fluctuate widely, ensuring that the system provides comfort without excessive energy consumption.