Do you have access to the furnace from the exterior? If there is a panel then you can remove it to see the various components.
Yes, it could be the thermostat but it could also be other things. On the older furnaces I've had success just removing and reseating the different electrical connectors on the furnace main board. Give them a bit of a jiggle as you reseat them to make sure you've got good contact. Sometimes they lose enough contact to prevent it from working.
Perhaps you could remove the exterior cover (if you have one) and post pics of the insides as well as a pic of your thermostat. Than might help in diagnosing.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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