The exhaust flue is also partly responsible for keeping dangerous gases and air contaminants from entering your home.
It's rather easy to check the flue; remove the cap and look through the opening. When you're finished, make sure the cap is replaced tightly and firmly.
DIY or hire a pro!
6) Keep flammable items away from your furnace
While this might seem a bit like common sense, it's still a very critical step in keeping your home and family safe.
In small rooms, objects tend to be closer together, and this can create an even more dangerous situation for your water heater and furnace.
Make sure there are no flammable objects within several feet of these appliances.
7) If your furnace looks like this....
...it's time to consider replacing. These old behemoths are notoriously inefficient at producing heat.