Home insulation is not just a function of the pink stuff between dry wall and double paned glass, but a product of proper home design and construction. Insulation does not end and begin with expensive construction products, but can be improved through inexpensive repairs and decorations that normally would not be associated with reduced energy bills and increased insulation.
Most people associate window decorations as merely being aesthetic treats, but the truth is that window shades and various other treatments offer valuable effects like increased privacy and reduced energy bills through increased insulation. This has to do with the layers, or pockets, of air that the shades create between the window and the fabric. Pleated shades are particularly good for creating insulation.
Adding shades can also be a more affordable option than getting brand new windows to deal with those cold NYC winters. When shopping for shades that will provide the most insulation, look for materials that are thicker than average, preferably ones that have air pockets between the fabric. This will create more insulation than traditional single layered fabrics. Also look for materials that are less porous in order to prevent the passage of cold air through the shades.