A Heater is designed to warm your home up by 20 degrees relative to the outside temperature. Therefore, set your thermostat accordingly. If the temperaure outside is 50 degrees, then set your thermostat for 70 degrees. If you have your thermostat set for 75 degrees or higher, then your Heater will never turn off. This will cause your energy bills to be at their highest and will cause the most wear and tear on your system.
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