The heating, ventilation, and air conditioning system are essential for keeping your residence comfortable throughout the year. The most extensive system within the unit is your furnace, and it should be working correctly, so it can keep your house warm during the harsh winter months. It doesn’t matter how aged your system is. However, you may run into troubles, such as your furnace system freezing up. If you’ve ever wondered how to prevent a furnace from freezing up, here are a few ways: