"I purchased my 20 Series Fireplace from Acucraft Fireplaces in 2001. I use the fireplace to heat my entire home. I installed an additional ceiling fan in my great room and I have an extra large air return in my great room. These two components aid in the whole house heating, all our bedrooms I am able to keep at a perfect 72 degrees. My fireplace is the best product I purchased for my new home. We use the fireplace as a supplemental heat source. The best part is not losing any heat up the chimney, by using outside air with the Acucraft airtight doors."