Thermal mass refers to the log walls capacity to absorb, store and slowly release heat over time. Logs have thermal mass because of their cellular structure, bulk and thickness. This thermal mass provides significant energy saving benefits because it releases heat back into the house when temperatures drop.

Because of this Thermal mass, fully scribed log homes in most situations are 20-30% more energy efficient in terms of heating and cooling than other builds. They will stay cool in the summer and warm throughout the winter.