Marvin came to my home 3 times to diagnose and fix a hard to locate lingering furnace problem (the last visit was on Christmas Eve morning!). What made this problem such as challenge was that the furnace worked fine most of the time but would sporadically and inexplicably would not fire up on random cold mornings. The usual fix of flipping the circuit breaker a few times finally stopped working. It was through Marvin’s conscientiousness and persistence of wanting to do a great job with pride that ultimately led to success. Upon his return to for the second visit to look at the unit, he stated he had consulted with the Trane Tech support to help diagnose the problem and thought he had it figured out (most of the problem was primarily from work done long ago by another company). After what he thought was the fix, he had to come back a 3rd time after the unit starting acting oddly with another set of problems. Promptly coming back on Christmas Eve morning, “never say die Marvin” jumped back in to additional diagnosis with another tech support source for the final fix. Marvin from Air Experts is now my go to guy for all furnace and AC service who I will ask for by name (I have a service contract with Air Experts). If you have a especially difficult to diagnose furnace problem that requires up and beyond the call of duty effort, Marvin is the guy to ask for at Air experts!