Add Yahoo as a preferred source to see more of our stories on Google. Getty Images Most homes will use a combination of a furnace and an air conditioner to control the temperature of the air inside ...

One of the things you, as a homeowner, need to know about having an old furnace is how to tell when you need to get it fixed vs. replaced, which you can often determine based on its age. Your system's ...

Most of us don't think about our furnace until it stops working in the middle of a cold snap. But just any other appliance (or your lawn mower's blades), your furnace has a lifespan. Thus, knowing ...