If you electric bill takes a major jump in the winter, you need to consider a few things. If you have a heat pump, something could be wrong with your unit. It’s very possible nothing seems wrong because the unit is heating. Most heat pump systems have auxiliary backup heat. When the heat pump outside is struggling, the backup heat kicks in to supplement on really cold days. The only problem is that if the heat pump outside breaks down or needs servicing, the auxiliary heat is adequate enough to heat your home, thus leaving you to believe the system is working fine. Auxiliary (or sometimes called “emergency”) heat is extremely expensive to run, usually at least triple what it costs to run your heat pump. Auxiliary heat is activated when the thermostat senses the temperature in the home is dropping too far below the set point. Most thermostats activate the backup heaters (auxiliary) anywhere from 1-3 degrees below desired temp. Often times people ignore the bill and blame it on the colder weather. While this could be true, look for extremes. For instance if every year your monthly winter bills are approximately $150 and it take a sudden jump to $350+, there is a good chance something is wrong. Sadly, most people ignore the bill, then when spring comes around and they turn on the AC and realize it does not work. Remember your heat pump may “seem” to heat properly, even if something is wrong, but it will not cool, period. Don’t wait until spring spending hundreds on electricity unnecessarily, and possibly damage your outdoor unit beyond repair during the process.