Excellent, thorough, thoughtful -- professional at all levels. We had multiple companies, over an 8 year period, troubleshoot our A/C issues to great expense. None were able to fix the issue. Diamond Quality did. They took the time and evaluated what really was the etiology of the problems. The issue was inherent in the design when the house was built; we had the expertise and critical thought of Scott who truly evaluated the situation. He had himself and crew address the etiology and correct the mayhem attempts of the other A/C companies. I cannot recommend them highly enough. Thank you!!