If you have a wood burning fireplace you should make having it swept yearly a normal part of your routine if you plan on using it at any point that winter season. Buildup from previous fires can ignite or filter hazardous fumes into your home. Even if you haven’t used your fireplace for some time, animals, debris and other unseen issues could create blockages or damage to the structure, so make certain to have an expert inspect it before you light the first match.