Big Dave was great. He came the first time to do a . second opinion estimate of my AC system. He was very detailed in the the estimate. Today he came and did the work. He showed me what the situation was, as I wasn't present for the estimate and I learned about my system. He even strapped up two air ducts so the system would be more efficient and less likely to damage the plenums in the future. I would definitely use Core Air in the future for maintenance and possible replacements when needed.