Ornamental Banana Tree Question.

PA zone 5b or sixish
I have some ornamental banana trees that I stored in the basement over the winter. One seems to have fared well losing it's main shoot and sprouting several new ones in contrast to the worst one which I finally chopped off it's shoot in desperation that it was so sickly it might rot the plant.
When I grow veggie seeds I have to break the plants into real light gradually or they turn white... do I have to do the same with banana trees? What are the coolest nights they can tolerate?
It's been very cold and rainy the last few weeks and even had a hard freeze several nights ago so I didn't put them out for little bits, but it is to take a dramatic turn starting this afternoon with near 80F and tons of sun tomorrow and mid 80's and high humidity and lots of sun after that. Should I just put them out there and let them go or do I need to break them in (I'd rather put them out there, but not if they'll die after nursing them all winter)?
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