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Not all gas fireplaces need a chimney. If you install a ventless gas fireplace, it will release low levels of combustion byproducts back into your living space (instead of pushing them outside through a chimney or vent). Ventless fireplaces burn fuel efficiently, so the emissions are minimal—but they could bother people with allergies or respiratory issues.

The best time to clean your chimney is before you need to use it, which for most people is during the spring, summer, or early fall. Spring and summer are often ideal because the chimney is not in use, and chimney sweeps can access the roof more easily without snow and ice. The warmer months are also better for making any necessary repairs. To avoid the rush when chimney sweeps get booked up in early spring and late fall, scheduling your cleaning for the summer can be a safe bet. It's recommended to book your annual chimney sweep during these warmer months to maintain a yearly schedule.

There are a few things you can look out for to ensure your chimney is safe to use. Check for the following issues:

• Cracks or missing pieces in the masonry of the chimney

• Creosote buildup in the chimney, which is a black, tar-like substance

• Cracks, stains, or scorch marks in the firebox

• Water stains in or around the fireplace

• A broken or stuck damper

It’s possible to clean your chimney by accessing it from the opening above your fireplace, but be aware that this method is messier because you will be pulling loose buildup of soot, ash, and creosote into your fireplace instead of up, out, and onto the roof. While the bottom-up method can cause more of a mess, it’s a good option if you’re not comfortable getting on the roof.