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How to tell if thermostat is bad

403 Views 8 Replies 4 Participants Last post by  SeniorSitizen
How do you know if a thermostat is bad. Our house seems cold yet the thermostat says the this 72. We put a thermometer near it and it shows 68. Furnace is working. Any ideas would be appreciated
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White Rodgers. It is a wall in the interior of the house. No drafts
I checked the furnace and there is a red light flashing once every 20 green flashes or so. It is an American Standard high efficiency system
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