Question. Where would you get 240V power all the time from the terminal block in the evaporator coil? As I said, I can get it between "N" and "3" when it's in defrost or I can get it between "N" and "4" when the fans are running, but there is no non-switched, all the time, 240V circuit at the terminal board. I would need to pull another wire from the condensing unit on the roof, which would have been a lot more trouble than installing a receptacle behind the evaporator coil.
Anyway, thanks for all the advice and suggestions everyone. I really appreciate it.