In standard residential split system central heat pump systems , the heat strip may be turned on during defrost to prevent colt air from being blown into the room .
I think our 2 MS HP's just run the indoor fan , very slowly during defrost .
As I said , neither have resistance heat . And they wewe both bottom line ( in cost ) or close to bottom line units .
Best of luck to you , :-)
Wyr
God bless
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