LunarFantom

I actually tried this very thing as I live very far north and it's legit freezing most of the year, so too cold for outside-nanas.

My Gros Michel perished but my Blue Java's been steadily climbing for a year now. I think the Michel was too small when I tried to transplant it, and I put the dirt too hit up the trunk. So even though I'm super late to the party here's my tips so far.

1. Don't transplant them too early. (obviously) When you do be careful not to go too far up the trunk with dirt. Keep the dirt line where it was before.

2. You need to keep humidity levels fairly high, but they prefer not to be misted. You can buy plastic sheeting fairly cheaply and keep it around your plant-area to make a sort of mini-green house. The plants and their moisture will already raise the humidity in this area but if you're air is still very dry (from your ac or heater) you can also add a humidifier to your set up. (careful not to put it too close to the plants though or you'll get dirt on the humidifier). Humidifier will almost certainly be needed once you turn on climate-control for your house.

3. Water plants once a week, no more.

4. Plant lights are your replacement sun. They're cheap and easy to obtain. You can get clamp lights for ~10 dollars at lowes and they sell special plant-lightbulbs too! Make sure the wattage of the clamp-light matches the wattage of the bulb. (You can test this by trying to screw it in before you buy).

5. They like acidic well fertilized soil. I used composed bunny-poo and peat moss for this purpose.

6. Space is tricky. They start off small and fit into almost any room but they will get large. I overcame this by putting them in my stairwell. The bottom step has ceiling space as tall at the roof of my top floor. This does make the staircase very inconvenient to use. If you like mountain climbing then free exercise! If you don't like twisting and turning or you use the stairs often maybe not for you.

I'm not sure what to do if you don't have a staircase-space. Pick a room with very tall walls? Dig a deep hole in the dirt floor of your basement? Actually that second plan sounds risky, call a contractor if you plan to do that.

7. They don't seem as picky about rootspace as I imagined they would, but if you find yourself needing a bigger pot, don't limit yourself to traditional garden pots. A laundry hamper (with a bag in it) or an (outdoor sized) garbage can is basically a huge pot with a little imagination. (drill holes in the bottom for drainage, this is easier before its full of dirt/plant).