Jeff zone 8 N.C.

The variegation is beautiful on that plant but is not the best for trying for bananas in a challenging climate. Maybe try a "short cycle" all green banana type. Also the 55 gallon "black" plastic drums of water on a south facing wall of a greenhouse works great in my greenhouse for moderating night temps. We do get lots of direct sun here though, but even on cloudy winter days the greenhouse warms up to summertime temps.