Even in the warmer months of the year, you should regularly monitor your furnace filter's condition -- and replace it as needed -- to keep your family safe and your furnace in good working condition.

We independently review everything we recommend. We may make money from the links on our site. Learn more› By Tim Heffernan Tim Heffernan is a writer who covers air and water quality and ...

Is your furnace blowing cold air? Here are some troubleshooting tips and simple DIY repairs for the most common causes for ...