When I had A/C issues last year I called a company that tried to pressure me into purchasing parts and services that did not seem relevant to the issue I was having. When I experienced additional problems with my system last month, I found Sterling Services through Yelp and thought I would give them a shot. They were excellent. Booking a service call took about a week and a half but that is expected this time of year in Arizona. When the technician showed up he was very thorough, concerned about the expense of what he was proposing, and fixed our system!
Would recommend this company for any of your A/C needs and ask for Steve. He was great!