My buddy Charles is a master plumber. He refuses to do absolutely anything with heating and air conditioner system. However every time my family need something rewired in our home or a new fuse put in or a light fixture installed. Charles is the first and only person that I will call to come over and do it for us. He’s a absolutely superb plumber and he knows exactly what he’s doing. it’s funny, though, whenever Charles has a problem with his cooling system or with his electric gas furnace, he only calls a professional Heating, Ventilation and A/C worker to come over and troubleshoot his system. I would assume that Charles would have a general understanding about how to fix a heating system or an air conditioner, since he’s a master plumber. I decided to asked Charles about it, he said that Heating, Ventilation and A/C systems are not the same and he respects their professional work. He said that he doesn’t ever tinker with his gas furnace, his thermostat, or with his cooling system. Charles will be the first guy to work on a messed up plumbing or repair your hot water heater, but he will not do anything to try and fix a thermostat, a gas furnace or an air conditioner. After first I thought that was kind of weird, but it is not his profession. I shouldn’t assume just because you think how to do plumbing work that you know how to do Heating, Ventilation as well as A/C work, too. If I ever learn to work on Heating, Ventilation as well as A/C systems, I will absolutely go over to see Charles when he has issues with his heating and his air conditioner systems. He absolutely has helped me enough times and I’d love to return the favor!