Welcome as well Elsie,
Other than your basement, which sounds like it is more warm than cold, do you have any other out buildings, sheds, and or barns or garages where you can take your potted fig and let it over winter? Remember that from time to time, you will have to provide a tad bit of water to this overwintering fig tree. Also, send us a pix or two of your tree! Welcome to the Forum!