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Let me grab a manual. Most likely the reason is the new furnace has a variable speed motor.
Yes, this is why it is not compatible, Nest had received numerous requests about this , but currently the existing thermostats they make do not support the variable speed fan on the new furnace.
Wish I had better news s I am sure you like the Nest but currently it is not compatible.You will probably need to use the iComfort from Lennox
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