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Insulation makes a huge difference when it comes to your comfort. You probably don’t worry much about your home’s insulation — or your windows — when temperatures are warm and days are sunny and bright. However, when the weather takes a turn towards cold and chilly, you’ll notice your insulation pretty quickly. And if your home’s windows aren’t well-insulated, you’re going to feel the chill indoors. While replacing your windows is a very expensive undertaking, there is another way to increase your insulation so your home will better hold onto heat: window insulators. A window insulator is easy to apply, and it can up your home’s warmth in just a few simple steps. Check out our picks for the best window insulator options right here.