Cool Air Technologies replaced all of our ducts that were leaking. Last winter our furnace was discovered to have leaks and was replaced too. In the summer, our AC condenser was fried and they replaced. We've been a customer for about two years now. We got them as a recommendation on Angie's List and they've lived up to their reputation. Cool Air Technologies are probably not the cheapest, but we went with them and we're not disappointed. They know what they're doing, they're nice to do business with, they show up on time, and they get the job done.