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Elec furnace runs to set temp, turns off 40 seconds, back on for 1 minute,then off til temp drops. New thermostat, batteries, filter.

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You can buy elec furnace thermostat batteries at Home Depot. To select the thermostat you need, identify your heating and cooling system and select the options that suit your life style. For more detailed information, go to http://www.homedepot.com/webapp/catalog/servlet/ContentView?pn=Thermostats&storeId=10051&langId=-1&catalogId=10053.

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It sounds like the hysteris setting in the thermostat is not right. I'm not sure that is adjustable these days.
If this happened with the old thermostat also, then I would consider the thermostat location. Could it be too close to a source of the heat generated by the furnace? Because, it sounds like positive feedback!

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