“Nobody talks about the worst part of being a heating installer. It’s not the early starts. It’s not the cold attics. It’s the stuff that happens after the install. You fit a system, everything works. Three weeks later, the customer calls, something is off. So you drop the job you’re on and drive across town. You can’t figure it out on your own so you ring the manufacturer; 20 minutes on hold, 30, 40. Still nothing. Now the customer is looking at you like you are the problem. You’re losing a day’s work, you’re not getting paid for it and…