I wish I had AC in my house wonder how much one would cost
Depends on what kind of AC you want and how big your house is.
I just had a Trane person give me an estimate of nearly $10,000 for an AC, a new furnace, and air cleaner and I thought that was much too high, but I have not had a second estimate yet. He frowned when I said that I was getting another estimate, so I think he knew his estimate was high.
He's probably right that we need to replace our furnace, because it's is as old as the house as far as I know. It has worked fine so far, but it is over 20 years old. He said that we would have to replace the blower anyway to have it be powerful enough to blow the air conditioned air upstairs, and that was a big fraction of the cost of a new furnace.