10 Best Window Coverings To Keep Heat Out 2025 in the United States

The Eclipse Kendall curtain is a solid, charcoal-colored panel made from 100% polyester, designed to combine style with high performance. Its blackout lining blocks 98% to 99.9% of sunlight and harmful UV rays, which is great for privacy and protecting interiors from sun damage. This makes it a strong candidate for bedroom windows or any space where light and heat control are important.

Thanks to its Thermaback technology, it offers thermal insulation that helps keep rooms cooler in summer and warmer in winter, potentially reducing energy bills. Noise reduction is an added benefit, which can improve comfort in busy or noisy areas. The curtain uses a grommet style for hanging and fits rods up to 1.5 inches, making installation straightforward. It’s machine washable, which simplifies care and upkeep.

The fabric isn’t water-resistant, so it’s not suitable for outdoor use or damp environments. The thickness is modest (0.1 inches), so while it insulates well, it might not block drafts as effectively as heavier curtains. If you want a solid, modern look with reliable blackout and insulation capabilities, this curtain fits the bill well for indoor use, especially in bedrooms or living rooms where you want to limit heat and light intrusion without compromising on style.

The rabbitgoo Blackout Window Film is made of vinyl and comes in a solid black color, providing full opacity that effectively blocks out light and heat. Its static cling design means you can apply it easily without sticky glue or chemicals, making it reusable and simple for DIY installation. This film is excellent at blocking 100% of UV rays, which helps protect your skin and prevents furniture from fading, a useful feature for anyone wanting to keep their home cooler and more comfortable. It also offers strong privacy by preventing outsiders from seeing inside.

The film’s size (17.5 by 78.7 inches) fits many windows but might not be suitable for double-pane windows due to risk of cracking, so it’s best used on single-pane glass. While it doesn’t provide heavy insulation like thick curtains, it does reduce sunlight and heat entering the room, which can help lower cooling costs. Its lightweight and slim profile mean it won’t add bulk or block your window view when you want light in.

The main downside is that it requires careful installation to avoid bubbles and gaps, but the included tips help with that. This product is a cost-effective and stylish option for anyone looking to darken their room, increase privacy, and reduce heat without the hassle of heavy window treatments.

The INSULATION MARKETPLACE SmartSHIELD Reflective Insulation roll is designed to be an effective thermal barrier, making it useful for keeping heat out. Its material is a 3mm closed-cell polyethylene foam core, sandwiched between highly reflective engineered foil on both sides. This construction ensures durability and efficiency, as it reflects 95% of radiant energy, which is excellent for heat insulation.

Moreover, the product is unaffected by humidity and moisture, making it versatile for both indoor and outdoor uses. Additionally, it acts as a sound barrier and is non-toxic, which means it won't cause irritation to the skin, eyes, or throat, making it safer to handle and install. It's also lightweight and easy to cut and clean, which adds to its convenience.

However, while it excels in insulation and ease of use, its primary function is as a radiant barrier rather than a traditional window covering. This means it may not provide the desired aesthetics or opaqueness of typical window coverings. It is best suited for spaces like attics, ceilings, walls, and other areas where robust thermal insulation is needed more than visual appeal.