On cue, Mother Nature throws Rutherford County into the deep freeze. Temperatures aren't expected to get above freezing again until Friday afternoon. Murfreesboro Electric spokeswoman Amy Byers says your heating unit is working overtime...

Byers says many HVAC units will struggle to keep homes heated when the temperatures are so cold...

Byers recommends checking around doors and windows for cold air. If you feel it, cover it with a towel or blanket. The keep to helping your heating units keep up will be to keep the cold air out.