I have used Dulin Mechanical regularly for the past 8 years. We have always found Dulin to be professional, reasonably priced and fair. Their last visit was to replace a leaking evaporator coil that they installed two years previously. The leak was a "pinhole", likely a manufacturing defect. Dulin replaced the coil with no charge for trip, labor or materials (the coil was still under manufacturer's warranty). They could have tried to pry more money from us, but that was never a worry. Dulin is one of the best in Charlotte.