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Now that winter is over and you will probably not use your fireplace much more this year, it is very important to make sure that the damper in your fireplace is tightly closed. This is a significant area of outdoor air and humidity leakage into your home.
Even though it seems like the damper is closed completely, many dampers do not fit tightly or seal well. You can stuff some old rags up around the damper to help seal it off. The best sealing method is an inflatable chimney pillow. You just place it up into the chimney and blow it up with air. It both seals and insulates. Check at your hardware or home center store.