Originally Posted by Pancrazio

I have kept for two years a Dwarf Cavendish and a Veinte Cohol in my room (17-20C), in front of an often closed west facing window. I live at 44N so my sun isn't yours, for sure. They stay this way for about 3 months. No problem so far. Of course their leaves become smaller and uglier at the end of the winter, but they do recover fine in spring.
The only thing i take care to do, i pot them about 2 months before moving them indoor, so when i move them they are well established.