air conditioning

im going back to school in a few days, so i decided to get my car back in shape as i wont have time once im at school. My a/c needed to be repaired, and i wanted it ready to go when it gets hot out. I was working on it in my garage which was about 45 degrees. can running the a/c in cold temperatures like this damage it?

no.
But, the AC should be done by a pro, as it must be pressurized, and I don't think you can do it yourself.