Windows are holes in the walls! Windows offer very bad insulation compared to walls. The insulation value for windows is just 10-20% of the insulation value of walls. About 35% of the energy for heating or cooling escapes through the windows. But pulling down Climate Curtains® when a building or room is vacant will reduce energy consumption and CO2 emissions by 20-30%. Climate Curtains® solution is simple and cost-effective. A large diameter curtain rod with many layers of reflective material, together with air, creates a wall that can be rolled up or down in seconds. Tested by RISE and Chalmers University. Patented. By saving energy, we save money, and the world gets less CO2 in the air."