When buying or seasoning your own firewood you want to make sure that the moisture level of firewood is between 15 and 20
percent. Anything higher, the efficiency drops, and the smoke output goes up.
When looking for the best-seasoned firewood, it will be dried until the moisture content is below 20 percent. This will take some time, six months at a minimum. When looking at the wood if it has been properly seasoned, the color should be faded. As time passes, the color will continue to fade becoming lighter and the wood will become hard.
Some think that unseasoned firewood will not burn; this is simply not true it may take a little more time to ignite, but the biggest issue with the unseasoned firewood is that it will create smoke and more creosote as it burns. For the best fires with the least smoke, you always want to use seasoned firewood.