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You should never block both the top and bottom of your chimney. Proper airflow is essential because the temperature inside the chimney will still fluctuate as your house warms and cools. Moisture can build up without ventilation, leading to dampness in your walls over time. Blocking the top prevents debris and animals from entering, but the chimney still needs air circulation to avoid condensation issues. Allowing the chimney to breathe maintains the health of your home and prevents long-term damage.

Some types of electric fireplaces use more electricity than others. Models that produce 1,500 watts will have more of an effect on your heating bill than 750-watt models. 

Electric fireplaces use an average of $1.85 of electricity every eight hours. These minimal operational costs aren’t likely to make a big difference in your electric bill—unless you’re using it as a primary heating source for your home and it’s running most of the time.

While hardwoods are the best woods to burn, a few types of woods should be avoided when burning. Wood that has not had time to season, or “green wood,” should be avoided. The extra water in the wood makes it smoke horribly, which is not a quality you want. Additionally, it’s best to avoid any wood that is manufactured or has been treated, including coated or sealed wood, painted wood, or pressure-treated wood. These woods have chemicals that will be released into your air when burned and can cause health problems.

Removing and demolishing a fireplace is extremely labor intensive work that also takes a long time. You need to use brute strength to break apart the brick and masonry, and carry the debris to a dumpster. Depending on the size of the structure, you may need multiple days to fully remove it. After removal, you need to determine how you will repair the wall that held the fireplace, which can also be quite time consuming and challenging.