My furnace stopped working in Feb when it was -12 outside. My house was 14 degrees inside when I woke up and was dropping. I called Stevenson and they sent out their service guy Paul. He couldn’t have been better. Immediately got into my furnace and started trouble shooting the problem. It turned out to be a bit tricky as the thermostat upstairs wasn’t communicating with the furnace. Paul figured it all out and was great at communicating with me what was happening. He even was great about my very curious dog sniffing him whenever he had to get on the ground to access the furnace.. I would strongly recommend using them.