hours, open the door and see if it is warm inside. sometimes they will malfunction and the heat will come on when it should not be.
notice your refrigerator and deep freeze. is the door closing completely? is any one of these appliances running excessively?
is anything shocking you? if so check it out. check all extension and appliance cords and see if they are warm to the touch or if you can smell an odor coming from them. if so, stop using them or have them replaced.
in the winter, heat tapes, heat bulbs or electric heaters in your pump house or on your water pipes will make a big increase in 