Check Your Chimney or Risk a Fire
Don't remember the last time you had it cleaned by a pro? A quick way to tell if your chimney needs cleaning is to run the point of your fireplace poker along the inside of your chimney liner. If you find a 1/8-in. layer (or more) of buildup, call a chimney sweep. For additional expert chimney maintenance advice, check out what two certified professional chimney sweeps have to say.
Stop Airflow Up the Chimney
For fireplace chimneys that are seldom or never used, inflate a inside the chimney to stop the air leaks. Buy it directly from the company . Partially inflate the balloon by mouth or with a pump, then stick it into the chimney and blow it up the rest of the way.
Putting in and taking out the reusable balloon can be messy (here's when to clean a chimney flue), so you don't want to hassle with chimney balloons if you regularly use your fireplace. But that doesn't mean you have to settle for energy loss. Instead, you can install a chimney-top damper system, like the , which seals the top of the flue when the chimney's not in use. A lever in the fireplace controls the damper via a long cable.
Installation involves attaching the damper and screened-in cap to the chimney top, then mounting the lever in the fireplace. If you don't feel comfortable working on the roof, hire a chimney sweep or mason, who can install the system for you.