Experience is key
This company is great. I learned my lesson by trying to use the cheapest company, three summers ago I hired a guy off craigslist and paid half the price of other bids. During my wedding reception at my house the air went out in the middle of July. Nightmare. I called Ardmore and they came right out, immediately identified the problem (fan installed wrong way in condensor) and repaired the problem.
I also used them to install a new energy efficient air conditioning system the summer after and the professionalism and knowledge within the company was again superior to any other HVAC company I have ever encoutered.
I am glad there are still professional companies out there like this.