But I use gas to heat my home, why would the electric bill be high?
Gas furnaces typically have blowers that are electric-powered, helping move the hot air through the ductwork. With extremely cold temperatures, those gas furnaces were running for long periods to help maintain the desired temperature inside. If you use an electric humidifier during the extreme cold to compensate for the extremely dry heat from your gas furnace, that could also add to increased electric consumption.
