EKSOTHERMO will develop thermochromic coatings on new as well as on already existing windows for energy efficient and energy saving in buildings. Thermochromic coatings, based on metal oxides, can change optical properties with temperature. The thermochromic coatings of EKSOTHERMO are based on vanadium oxide, its alloys (A_xV_1-xO₂, Α= W, Mg, Ir, Nb,…) and multilayers