Evaluating Window Film Does your building have windows facing the south or west? Are those areas an excessive heat problem for workers or tenants? Solar heat gain can increase utility bills and stress AC systems, causing them to break down and wear out prematurely. Carpets, furnishings, and other office products can suffer from fading and heat damage. "Solar Control Glass" can help eliminate this problem, but replacing all the glass on half of your building may not be a very attractive option. Far more palatable is the idea of adding Solar Control Film over your existing windows — film that can block or reflect damaging light. But no one wants to make it dark inside either, so getting the right sort of tint or reflectivity can be a careful balancing act. Consider "spectrally selective" film, which allows visible light in but blocks heat and infrared/ultraviolet energy. Almost colorless and transparent, spectrally selective film offers the best solution for many buildings. Beyond potential energy savings, keep in mind that window film can increase productivity or customer comfort and make a substantial portion of your building usable again.