Furnace 2 1/2 years old. First off Tech was very good. He found a air flow problem because some dampers were closed to force more air to a large room. Also found a fuse blown to the electronic air cleaner that Scheider had installed. That fuse shut down the furnace but it had been wire up backwards. + and - wrong. Paid the $99 but feel it should have been Warranteed. Also 10 hours and I never received a call they were not coming.