Cold weather and snow can do a lot of damage to the systems of your home, and your furnace is no exception. With the cold temperatures and snow, there are a few preventative maintenance tips every homeowner should do that will prolong the life of your furnace. 1. Change the filter. Every HVAC company says you should change the filter on a regular basis, which is true. The filter filters out the bad stuff floating around so that only "pure" air is being forced through your for