A supplemental heat source is not needed for any given ssp's of milk snake given the ambient temps are in the low 80's during the day and low 70's at night... and those ambient temps are in fact too high for some ssp's of milks... Yes, no?

I use the data given in the link I've provided to determine what temps I'll keep my milks at... using the average temp as a starting point.

Gerry
Climate Data