Your furnace may not deserve all the blame when it comes to having to wear an extra sweatshirt around the house. Door and Kewaunee Counties have already seen its fair share of snow this winter and will get single-digit temperatures for the first time on Tuesday night and Wednesday. Ultimate Air owner Jeff Blemke says the biggest culprit of cooler homes is oftentimes not the furnace itself, but its filter.

Along with making sure your furnace is maintained every year, Blemke recommends homeowners keep a close eye on their outside vents to make sure drifting snow is not blocking them.