David, if I may chime in a bit late on the humidity question - yes, all tropical plants love humidity and the more the better. Cold air holds less moisture than warm air, though. So when you let your temperatures fall during the day while you're at work, as the air cools off the humidity drops.
That being said, lots of "indoor" plants grow outdoors down here in Florida and we do have some cold nights in the winter, and lower humidity days that accompany the cold nights. The plants will slow down and possibly go dormant but it won't hurt them for the most part. Just don't expect them to grow and thrive the same as in summer. You should also ease back on watering and fertilizing for the months when the temperature drops in your house.
If you want to keep them growing and lush looking, you will need to keep them warmer, and in good light.
