I bought their reduced price service contract through another site. It was wonderful! I had another company, but they rarely came out, and their technicians were not very competent. I had to read the instructions for one of their techs and explain it because he had limited English. This was a sign that I needed a new company!
Aire Serv has been wonderful. Originally, I got a one call service special. Once the tech was out here, he said that I needed an expensive part. He told me that if I got the service contract, it would be cheaper, so I did. He gave me the discount and finished the work.
A few months later, I still was having trouble getting the AC to run upstairs. The last company quoted a price of $1500. Their tech said that it was a motor problem, and that the motor in the AC had to be replaced. The Aire Serv tech came out and said that I had a "zone" system, and that it was not working correctly. The price quoted for the part was a fraction of what the other company wanted to charge! The AC has never worked better!
The checkups on the AC and heat have been thorough. They have a plumbing affiliate now.
Overall, my experience with them has been very positive. They even call you to remind you of services.