There's work being done on incorporating paraffins and other such materials into walls, so that they go through a phase change close to room temperature. That w

There's work being done on incorporating paraffins and other such materials into walls, so that they go through a phase change close to room temperature. That way they act like heat mass, but without all the weight: https://www.doityourself.com/stry/phasechangedrywall https://www.doityourself.com/stry/phasechangedrywall