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Best Window Films From Our Tests
This article explores the effectiveness and ease of installation of various window films designed to help keep homes cooler and reduce energy costs. The author, Jodhaira Rodriguez, recounts her personal experience with a warm apartment in New York City, leading her to investigate window film as a solution for heat reduction without sacrificing natural light or views. The article highlights that window films are applied to the inside of windows to block solar rays, thereby lowering indoor temperatures and potentially decreasing home cooling expenses. An additional benefit mentioned by manufacturers is the minimization of furniture fading due to UV exposure. The installation process is described as a manageable DIY project, requiring basic tools such as a spray bottle with soapy water, a squeegee, and a cutting tool. Rodriguez's testing involved four popular window film products: BDF, Coavas, Gila, and Greenfilm. She evaluated these products based on transparency, scratch resistance, durability, ease of installation, clarity of instructions, and ease of removal.
Greenfilm's G-Cling Static Cling Film, with a light blue tint, emerged as the Editor's Choice. It was praised for its thickness, which facilitated easy and smooth application, and its effortless backing removal, preventing self-adhesion. This film also allowed for bubble-free application and maintained excellent visibility, even after prolonged exposure to cold temperatures in a freezer test and direct heat. It is marketed as reusable and blocks a significant percentage of UV and infrared rays while allowing 73% visible light transmission. BDF's NSN70 Window Film was named Runner-Up, noted for its thinness yet manageable application, with two necessary installation tools included. Although its thin backing was challenging to separate, the film adhered well, resisted scratches, and left no residue upon removal. It features a slight yellow tint that does not significantly impede visibility and is claimed to reject 45% of total solar energy and 99% of UV rays, with 68% visible light transmission.
Coavas Window Privacy Film, characterized by a smoky black tint, offered sun-blocking and privacy features. Its thickness made installation relatively easy, similar to Greenfilm, but the instructions were minimal, and some bubbles remained after squeegeeing. This film significantly affected visibility, making it suitable for privacy in ground-level windows. It also demonstrated resistance to temperature changes and scratching, leaving no residue. Coavas states its film blocks 90% of UV rays and 85% of infrared rays, with a low visible light transmission of 12%. Gila Heat Control Light Gray Window Film was the most challenging to apply due to its thinness and tendency to cling, requiring multiple attempts for a neat installation. Despite the difficulty, it showed good adhesion, durability against temperature extremes and scratches, and left no residue. Gila claims it rejects up to 57% of the sun's heat and 99% of UV rays.
The article concludes with practical tips for a successful window film installation, including the importance of thorough window cleaning, using an extra set of hands for application, generously applying soapy water to both the window and the film, and employing an organized squeegee technique from the center outward to avoid bubbles. The use of a very sharp box cutter for trimming excess film is also emphasized to prevent damage. The testing methodology involved evaluating films for transparency, scratch resistance, and durability on glass window panes, subjecting them to extended cold temperatures in a freezer and direct heat to test adhesion and overall performance.
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