Mud houses in traditional cob and adobe designs tend to be built thick, partly in order to be sturdy, but also because the sheer mass of the walls acts like a h

Mud houses in traditional cob and adobe designs tend to be built thick, partly in order to be sturdy, but also because the sheer mass of the walls acts like a heat capacitor that can be used to either absorb cool night temperatures and smooth the temperature extremes, or warmed with a constant low level fire for colder climes.