3 Warning Signs – It’s Time to Replace Your Old Furnace Home Improvement by Karleia Steiner - November 7, 2013March 22, 2014 The air quality inside your home is of utmost importance to your family’s comfort and health. Compromised heating systems can lead to serious health problems, such as asthma, allergies or headaches, and keeping your furnace running properly is key to safe home air quality. Even the best furnace won’t last