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Energy-efficient windows are judged on their performance according to a few different factors, including heat transfer, air leakage, light transference, and condensation resistance. If you're unsure whether a window is energy-efficient, look for an ENERGY STAR® label from the U.S. Environmental Protection Agency (EPA). If various products, including windows, meet energy-efficiency standards set by the federal government, the EPA issues this label to help consumers identify energy-efficient products.

If your window film doesn’t come with an installation kit and its own application solution, you can make your own—but don’t use soap! Instead, use 1 teaspoon of baby shampoo mixed with a gallon of bottled water. Make sure the bucket in which you mix this solution is completely clean.

While you need heat to peel back window film, the tint will often leave behind adhesive residue. You can use chemicals such as isopropyl alcohol or acetone to remove the residue, though hardware stores sell specialized solutions for this purpose as well. You can also use soapy water in a pinch!

Some frosted glass sprays can handle the outdoors, but most of them aren't built for it. Sprays made for exterior use will say so clearly on the label. Anything marked “interior use only” can't hold up against rain, UV exposure, or changing temperatures without peeling, fading, or yellowing. Outdoor-rated sprays are typically more durable, but even then, proper prep and application matter. Before spraying anything outside, double-check the product instructions. If it doesn’t specifically mention exterior use, skip it.