Could be a thermostat issue...
In your OP, you mention that "everything" works fine except the furnace. I assume this means you've used the air conditioner and it's working as expected (turn A/C on, lower the temp, A/C does indeed produce cold air, turn temp back up above room temp, A/C turns off).?.?
That won't guarantee it's not a thermostat issue, but would make it much less likely.
Also you said you checked all the fuses. What about all the circuit breakers?
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