New A/C

I was going to post this over on atlanta, but I thought I would take a shot at it here as well:

My A/C has gone out and we have been receiving random quotes from companies around our area (Cumming, to be specific). The problem is, it is hard to know which companies are best to call and/or to get service from.

Does anyone have any recommendations for HVAC companies? Or any horror stories?

Thanks so much in advance!