Considering the characteristics of European cities, energy efficiency in historic buildings stands out as one of the main problems for urban policies farsighted. Sara van Rompaey illustrated a simple handbook of strategies and main programs that deal with this issue.
historic buildings (pre 1945) are 10% of building stock
guidelines for simple solutions to avoid irreversible damages
box in a box
roof: invisible insulation
windows: new interior windows; films;
high insulation single glass (expensive)