DISCLOSURE: We didn't hire JDK (a competing offer was too good to pass up) That said, our experience with them was excellent. JDK called within 24 hours of my initial email to schedule an appointment for a load calculation and potential HVAC replacement. They came out and were able to quickly identify the root cause of our air flow issues, get a load calculation, and provide a proposal with multiple options. Based on their proposal and our conversations, JDK takes true pride in the quality of their work. Their professionalism and knowledge are stellar and I've be happy to work with them in the future.