During winter in Philadelphia, a lot of heat escapes through the windows. When compared to walls, windows are less insulated because glass has an R2 insulating capacity, which is low. Winter window treatments can help solve this problem. Certain solutions can raise the insulation rating for each window to R7 or higher. Good insulation is crucial because it leads to reduced heat less and lower energy bills.DrapesConventional drapes can lower heat loss by 10 percent. However, to achieve the best results, the drapes must be hung extremely close to the window. To reduce heat loss by 25 percent, place a cornice over the drapes and overlap the fabric in the middle. This technique will create a barrier with improved insulating abilities.