The Family Handyman on MSN

How to Change a Dirty Furnace Filter

If you’re thinking you only have to change your furnace filter once a year, you may be shortening the life of your furnace.
Your furnace works hard to keep your home warm and comfortable throughout the colder months. Yet, one of the most overlooked maintenance tasks.
Q: I turned on my furnace for the first time this year, and it made the whole house smell musty. I checked the filter and found it caked with dust, so I replaced it with a new filter, and the indoor ...
Besides the occasional smoky smell, your furnace should blow fairly odorless hot air. If you catch a whiff of these odors, it ...