Windows are usually the weakest point in a home's thermal envelope, and film is one way to change how they behave without replacing them. Solar control film reduces the heat arriving through the glass in summer, which eases the demand on air conditioning during Iowa's hot spells. Low-emissivity films work on a different principle, reflecting interior warmth back into the room during the colder months. The right option depends on the glazing you already have: a modern double-glazed unit with a coating is already doing part of this job, while older single glazing has more to gain. Film also filters UV and cuts glare, both of which make a room more usable day to day. Results vary with orientation, shading and how the house is heated and cooled, so have a Kepler dealer look at the specific windows before choosing, and have the existing glazing identified first. The film has to suit the glass it goes on.
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