Ok so the 12 year old Lennox furnace was stopping and taking too long to start yesterday and a couple times before that time. So, I filled out a form online that the original installer had. I input my name, address, phone number and email. Within 2 minutes I got a call and they said a repairman could come out at 2:00 which was fine. This is the same company that installed the Lennox furnace and new air conditoner unit and A-coil. The man came out and within an hour he replaced the flame sensor for the tune of $425.00 which I thought was quite high since I have been a long time customer I felt I was over charged by at least $100 to $225.00. The flames sensor is about $10 to $20 and is an easy install. Anyone else think this was too high?