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Furnace working then blows cold
I am having the same problem with my Trane. We have lived here for about 4 years and have had the problem for 3 of those. It has been serviced and were told it was about 10 years old. It can go an entire day without a problem and then I'll get up it the morning and it will be 60 degrees in the house. I'll fiddle with the thermostat switch upstairs and turn it off for a few minutes then I'll turn it back on and it will be fine for a while then it will just start to blow cold. I would appreciate any feedback. Thanks
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