The 3 Best Thermal Curtains To Keep Heat Out

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If you struggle with rooms that overheat or aggressive sunshine, the best thermal curtains to keep heat out are a smart investment, and can be a real lifesaver during sweltering summers or in consistently hot climates. In fact, they can even save you money by keeping your room colder without you having to purchase an air conditioner or fan.

While, yes, thermal curtains can reduce light by up to 90% and insulate against heat, it's important to note that not all thermal options are alike. For the best insulation, look for a thermal curtain that has at least two layers, triple-woven fabric, and blackout technology to eliminate light and even noise. And while it may initially seem like the bigger the price tag, the better the quality, that's not actually the case. There are plenty of high-quality curtains that are totally budget-friendly.

And, as you shop, don't forget to keep in mind the size and length of your window. Length will be particularly important, as you want to get heat-resistant curtains that match your space requirements, and many of the options on this roundup feature curtains that come in a variety of lengths and size options.

But, with so many options out there, it can be easy to get lost in the choices. That's why I've gathered the best thermal curtains to keep heat out here for your consideration.


Best Overall: Best Home Thermal Blackout Curtain

These thermal curtains by Best Home Fashion top the list, and with good reason. For one, they feature a thick, triple-woven lining that blocks out up to 99% of light and 100% of UV rays, keeping your home cool in even the hottest weather. They also feature antique brass grommets to keep fabric from tearing, and the curtains come in a variety of colors so you can match just about any room. And, because you can buy these curtains in an extra-wide size (100 inches wide!), these are the best if you're looking to outfit a sliding door.

Helpful review: “Love this brand of black out curtains . I have bought several others in the past however these are buy far the best. I have them in my kitchen over my sliding back door and in my living room to block out the summer 110 + Las Vegas summer heat and I'm so glad I did!! I will be buying these panels for every room in my house!”

  • Available sizes: 80"W x 96"L, 100"W x 96"L, 100"W x 108"L
  • Available colors: 18


Best Pick For Smaller Windows: AmazonBasics Room Darkening Blackout Window Panel Curtains

If you're looking to insulate a smaller window, short thermal panels are the way to go. At under $35 for two 63-inch long panels, these curtains will fit just about any window without too much overhang, and with so many colors and sizes to choose from, it's easy to find a perfect match. Made with triple-woven fabric, these curtains block out sunlight and UV rays.

Helpful Review: “Block the sun well. Very sturdy [...] Been using these for a few years now and they keep my room cool in the summer and dark in the morning.”

  • Available sizes: 42" x 63", 42" x 84", 42" x 96", 52" x 63", 52" x 84", 52" x 96"
  • Available colors: 21, including solid and patterned options


A Fun, Patterned Pick: HLC.ME Lattice Print Thermal Insulated Blackout Curtains

Made with soft, thick polyester, these thermal curtains feel like velvet to the touch and effectively block out sunlight. And like all the best thermal curtains out there, the fabric is triple-woven to reduce light and noise dramatically, making them the perfect addition to any bedroom. Bonus: They're completely machine-washable so they're super easy to care for.

Helpful review: “Definitely work against the heat outside! [...] My apartment gets sunlight all day long - which is great, mostly. But when it's hot and sunny, it can boil in the apartment. I got these and noticed a SIGNIFICANT difference. They are pretty wrinkly, but I'm sure if you wash them before putting up, they'll be fine. They aren't fully light-blocking, but they're great to keep the harsh sun rays and heat at bay.”

  • Available sizes: 37 W x 54 L, 37 W x 72 L, 37 W x 84 L, 37 W x 96 L, 52 W x 45 L, 52 W x 54 L, 52 W x 63 L, 52 W x 72 L, 52 W x 84 L, 52 W x 96 L, 52 W x 108 L
  • Available colors: 9