Don't be fooled by their advertisements for serving deals. Most recently, their advertised service deal didn't include anything but paying someone to look at the AC unit...no cleaning. We were quoted 700 bucks for 5 lbs of coolant for a leak, extra for some sealer that may or may not solve the problem.
I called an independent, licensed, and insured contractor who serviced the unit included cleaning (even cleared a clog on the drip pipe, no charge). He also charged the coolant (only 1 lb was needed) and found and fixed 1 leak ( a common spot for leaks). Total cost was much less than George's quote.