Dave Haddon IS very knowledgable and competent. He gave me by far the best price quote on a new air conditioning system that included some additional piping work that needed to be done. He promised to have the job done in one day - and even brought in a third person for the installation to ensure that they would be able to finish it in a single visit. Even when they ran into a minor glitch with a malfunctioning regulator valve, they finished the job on time. I've already referred Haddon to a neighbor and a co-worker. I'll absolutely use them for any of my HVAC needs. AND they guarantee their labor for the first year over and above the manufacturer's warranty on A/C meaning no charge for service on a warranty call. Good luck finding anyone else to do that at the price Dave will charge you.