Energy-efficient window film works on heat moving through the glass, which is often the weakest part of a home's envelope. In summer, solar control film reduces the amount of solar energy entering sun-facing rooms, so cooling systems cycle less and temperatures stay steadier from room to room. Some constructions also help retain warmth in cooler months. Alongside that, film reduces glare and filters UV, so the same upgrade improves day-to-day comfort as well as the way the house handles the sun. For many homeowners it is a far smaller project than replacing glazing, applied to the windows already in place. Results vary with the film, the existing glass and how much sun each elevation receives, which is why a dealer should assess the windows first.
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