We replaced our furnace and air conditioner on the word of St. Paul Plumbing & Heating . Somehow after talking on the phone with the guy I had the impression that the heat exchanger was cracked. The written work order says, "Dirty Blower Wheel, Blower Motor Leaking oil, Capacitor weak, Heat exchanger Rusty & Very stressed." I've included photos my wife took of the heat exchanger when this furnace was removed. If anyone knows about these things, maybe you can tell me if it looks rusty and very stressed. 8/30/2012 - Wayne from St. Paul Plumbing & Heating has asked to see more pictures of the heat exchanger so he can point out the rust. I've informed him that I've already put the rustiest pictures on this blog and told him that he can refund the $89 for the 'tune-up' (when we were told the furnace was beyond repair). Since he originally threatened legal action against me if I put untrue statements on my blog, I've invi...