remove the thermostat. take it to a *local* hardware store, where you can talk to somebody who knows what they're doing. this may or may not be the borg (derogatory comment on megahugebigboxhardwarestore). buy what they tell you. This strategy worked *very well* in my recent hardware (guitar) quest.
Almost certainly, any plain thermostat will do the job of monitoring the temperature limits and sending the signal to the furnace to turn on and off.
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Be Just and Fear Not.
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