Question

question 13 a heat pump in the defrost cycle has the outdoor fan running is working at maximum efficiency may have the system operating in the cooling mode will shut down the indoor house fan will shut down the back - up heat

Explanation:

In the defrost cycle of a heat - pump, the system may reverse its operation to melt the frost on the outdoor coil. This can involve operating in a mode similar to cooling. The outdoor fan may stop to prevent cold air from being blown outside during defrost, it is not working at maximum efficiency during defrost, the indoor fan usually keeps running to maintain air circulation inside, and the back - up heat may or may not be affected depending on the system design.

Answer:

may have the system operating in the cooling mode