The burners on my furnace wouldn't start when the 2nd stage would start. The error code pointed to the pressure switches. After shutting everything down and restarting the system, the burners finally kicked in, but I wanted a more experienced professional to look things over. After looking around, Green-Tech had some good reviews and their office was nearby, so I called the next morning. Rory was able to come by a couple hours later and he looked everything over and confirmed that the issue was most likely the pressure switches, but he probably didn't & have any available. He mentioned they werent expensive and I could order them and fix them myself, so I did. After talking with him for a bit, he also agreed that it's probably a good ideal to keep a few other backup parts on hand too, such as the flame sensor and flame ignitor as those are relatively easy to replace. Overall, Rory was really great in providing his expert opinion and not try to sell or upsell anything more than what was needed. But also, knowing I was capable of doing some basic repairs or replacements, he recommended keeping certain parts on hand. Will definitely call him again generally, and when we are ready to have our A/C and a-coil installed this spring.