What device is a resistance heater in parallel with the cooling circuit used for?

A resistance heater in parallel with the cooling circuit serves a specific purpose related to the operation cycles of the cooling system. When a parallel resistance heater is used, it helps to manage the temperature during the OFF cycles of the cooling system. Specifically, it can reduce the time for which the compressor is not running by quickly supplying heat when needed. This can prevent conditions that may lead to freezing or other issues during periods when the cooling system is not actively running.

This arrangement ensures that the system maintains a more consistent temperature and can effectively prevent the potential for ice formation on the evaporator coils, which can happen when the system is not in operation for an extended time. By shortening the OFF cycle and maintaining a suitable environment, the heater contributes positively to the overall functionality and efficiency of the system, particularly in cold conditions.