Stuck on AC high ... no heat ... winter is coming!

What is your question?

My dials that control the fan speed and the temperature setting don't seem to be communicating. You can turn and turn them and it does nothing. I have been stuck on AC high since May, which is fine for now...but winter is on the way and I don't think the AC will feel too good when we are in the 30's!! :) Has this happened to anyone else? If so, what was the problem?