Jeffrey was sent out from my property management company to look at the furnace, since it was only working intermittently, switching on and off every few minutes. The problem wasn’t happening when he first arrived, but instead of leaving he inspected the system carefully and noticed several prospective problems. It’s very fortunate that he took a while to diagnose because the problem started occurring before he left, so he was able to gather more information to submit to the property management company. Very happy with his expertise, thoroughness, and willingness to explain.