Jeff zone 8 N.C.

pitangadiego has given you good advice. I would use at least one 5 gallon bucket (dark color if you got one) of water inside the enclosure on the sunny side to warm up in the day and hold a little night time heat. I don't think you have to do anything till nights start dipping into the mid 60'sF. Banana plants can be sensitive to cool and just refuse to do anything after even a cool night. Not sure if Orinoco is that sensitive but if you are going to expend the effort then might as well play it safe. And try not to let the enclosure overheat too much. To clarify about Plant Delights advice, his leaf cage is for preserving the stalk height and the near surface underground corm over winter so next spring you get a taller plant sooner and maybe an earlier bloom. I don't think it was for producing bananas but as long as the leaves and bunch are in the open air then it's probably an advantage. I remember seeing Tony's (owner of Plant Delights) cages many years ago on the Fair grounds during the State Fair. I was amazed that he overwintered even some tender bananas like that in Raleigh.