Correct Temperature for Phal in S/H?

[zachkent29]

I'm getting ready to take a Phal that is currently in a bark mix into S/H. It has multiple new roots that have just started and I understood that this was the right time to move plants into S/H.

My only concern is the temperature. I've read many people say that the Phal's sometime struggle with the reduced temperature that S/H brings to the roots. What exactly is a good temperature? The plant sits in my window in Georgia and stays 80 degrees (Fahrenheit) during the day and 72 at night. The room has between 40% and 50% humidity and there is a ceiling fan always going.

The rooms stays about 72 degrees during winter days and 65 degrees at night.

Has anyone had success with Phal's in S/H at these temperatures without a heat mat?