It’s no secret that summers are getting hotter, and cooling costs aren’t getting any lower. While cranking up the air conditioner might be the usual response, there are smaller changes that can make a big difference. One of them? Curtains. Specifically, customized curtains to keep heat out.

Not all window coverings are created equal. Some trap warmth, others block light, and a few can do both without making the room feel like a cave. Choosing the right type depends a lot on where the windows are, how much sun the room gets, and the fabric itself.

Looking at Thermal Curtains First

Thermal curtains aren’t a new idea, but they’re often underestimated. They’re usually made with extra layers—sometimes including a foam or felt core—and that added thickness helps reduce how much heat passes through.

These curtains work best when:

- They’re installed close to the wall or frame
- The material has some density to it
- The outer surface is light in color (yes, white or cream works better than navy)

They’re not always the softest or most flexible in terms of design, but in bedrooms or west-facing windows, they tend to pull their weight.

Linen Curtains do More Than Just Look Nice

Linen is usually picked for its casual, natural look. But in the right setting, linen curtains can actually help with temperature regulation. They don’t block heat the same way a thermal curtain does, but because the fabric “breathes,” it allows for better airflow. In stuffy rooms, this makes a difference.

It’s common to see linen used in areas that don’t need full blackout—think kitchens, relaxed dining rooms, or spaces where light is welcome but glare isn’t. Want more insulation? A separate liner behind linen panels can quietly do the job without changing the appearance from the front.

What Else Is Worth Considering?

Curtains made from cotton are another reliable option—especially for people who prefer something washable and not too heavy. Velvet, on the other hand, is better suited for winter insulation (though it does block sunlight well). For people who prefer a layered look, pairing sheer panels with heavier lined curtains offers both control and flexibility.

Color Is About More Than Just Style

This part gets overlooked a lot: curtain color effects temperature. Lighter shades reflect sunlight, while darker fabrics absorb it. That’s not just theory—it plays out in real-world rooms.

When choosing heat-blocking curtains, pale tones are generally more effective. If a room’s aesthetic calls for deeper hues, using a reflective lining can help counteract the extra heat absorption.

And Don’t Forget How They’re Hung

Beyond fabric and color, how curtains are installed matters. Small adjustments, like mounting the curtain rod higher than the window frame, or letting the panels touch the floor, help create a better seal. This can keep warm air from circulating in.

Also, using wide curtain rods means the fabric can fully cover the glass area, especially on sunny afternoons.