I was replacing the batteries in my non-programable thermostat and once the new batteries were inserted, the thermostat began smoking. I pulled the batteries and noticed the display had gone out. Looks like something "fried" the thermostat. Blind & Sons do all of our HVAC & plumbing work, so I called them to see if someone could come out to do an inspection. The dispatcher called and said a technician would be there within a half hour. 10 minutes later, the technician called and said he received the work order and was on his way over within 15 minutes. The tech (John Williamson - Tech #884) arrived right on time, was very professional and went straight to work. After looking over and testing various connections on the furnace & air conditioner, we was satisfied there were no other issues. He straight lined the thermostat directly into the furnace, replaced the old thermostat with a new Aprilaire non-programmable thermostat and tested everything. All working well. After an hour, John left as professional and courteous as he arrived and had our issue resolved to our satisfaction. Thanks John! The only issue I had was the steep price of the new thermostat, which Blind charged me $140. I could have went out and bought a comparable thermostat for less than $50. Total bill was $230.00 (which included a $90 service call). I used one of my $25 Blind & Sons gift cards so our final cost was $205.00.