Heat pump fills house with foul odor.?
Last summer I replaced my Rheem heat pump with an identical size and make. The duct work was not replaced but checked and is in good condition. Since the weather turned cold it fills the house with a foul odor every so often. When it happens thick steam rises from the unit outside the window. The service man says that the unit is going through the defrost cycle. Why does the new unit do this and the old one did not? Any ideas? Thanks.