>One of the big problems is paper thin walls of modern buildings and using materials and colors that absorb and retain heat. We have the technical solutions sin

>One of the big problems is paper thin walls of modern buildings and using materials and colors that absorb and retain heat. We have the technical solutions since centuries but there is no willing to do things properly in this crazy captalistic society that we live now. The r-value of 16 inches of concrete is around 1.75. The r-value of 1 inch of top end insulating foam is 7.20. R-value is how resistive something is to transmitting heat. Or in other words, the reason we don't have thick walls is because modern insulating material is well over an order of magnitude better at insulating than concrete/brick/etc. edit: And they used dark materials because in most of Europe you used to be much more concerned about heating in winter versus cooling in summer. That's, obviously, changing now but acting as if it made no sense is just silly.