For years I kept the tropicals in a bay window when they came inside. The window is not available now because we are having foundation repairs being done and temps dropped below 10C last week, so the ficus and others are now sitting indoors under a grow light. We'll see how that works.
Usually the baobab drops all its leaves a few days after coming inside and the other two follow suit quickly. So far, after a week, not a leaf has fallen. The light is set for 6 hours and they are happy, so far.
There will be real news in a month or so.