Glass is usually the weakest point in a home's envelope, and in Baton Rouge most of the pressure comes from summer solar gain. Window film works on the pane you already have, cutting the solar energy that enters through sunlit windows so cooling systems have less to fight against during the hottest part of the day. That can also make rooms more usable, since you are less likely to close blinds on a bright afternoon just to keep the temperature down. How much difference film makes depends on the product, the shade and the glazing it goes onto, so an installer should identify your existing windows, single or double glazed, clear or already coated, before recommending anything. Compared with replacing windows, film is a far less disruptive way to change how the glass behaves, and it can be combined with UV filtering and glare control in the same product.