I don't know what "FHA" heat is, but near a register is bad. For light, that's probably the best - if you can put it somewhere away from the register, and as long as it is at least 60F (70F or more is better).

The "bright room" with afternoon sun could be ok, if it gets bright light all day. Cold drafts from letting the dog in and out shouldn't be too much of a problem, as long as you're not having to stand there with the door open for more than 20 or 30 seconds, and the dog isn't going in and out all day.

It won't do well in position C. Indirect light outdoors is much brighter than indirect light indoors. It needs window(s) and plenty of natural light, preferably a southern exposure.

Wherever you put it, it will drop some leaves at first. It'll do that again when you move it back outside.

FHA is Forced Hot Air -- the worst kind for plants!!! And of course, the floor register is right in front of the windows. best light. worst air. ugh.

I just found the following article and ID'd which kind of ficus it is. The article is encouraging that it won't be so fussy. Although I am a bit skeptical because it states that this kind of ficus is not a shedder. That is not my experience.

http://www.houseplant411.com/houseplant/ficus-ali-plant

Ok, I am afraid of the cold drafts in the best lit room, but I think I will try it out there -- at least until the weather gets brutal cold. I will get to enjoy it the most in that location.

I have a huge split-leaf philodendron in that spot now which I think (hope) will do well in the morning sun cool room with 4 windows.

Well, here it is next year and I have the same quandry. Last year in the best window that I have (southwest - Choice A above), it still shed tons of leaves. By December it was quite ugly so I hid it in a less visible spot when entertaining for the holidays and I just left it there until it was time to bring it out this spring. Of course, it bounced back beautifully outside so that's good.

So now I came up with another option. In my unheated basement I have a flourescent light setup for overwintering other tropical table plants. I could re-arrange things and give the ficus some of the light as a floor plant. It's great light -- most plants have done fine there, but the basement is a bit cool. e.g. Coleus don't like it down there. I would say usually its upper 50's, sometimes low 50's. There would be no drafts from doors and windows. There would be no dry heat. Happy light but cooler temps.

What do you think?

I don't think it would agree with the cold.