Need to know how to block sunlight heat from windows? Window blinds, shades, and panels all provide DIY window insulation, but also block light. If you want any natural light, or a view, you need something that blocks sunlight heat from windows, but lets the light in. Indow window inserts are the best way to block heat from windows while still seeing the light.

Click through to various ways to keep heat from coming through your windows, or keep reading to learn how one homeowner blocked heat from coming in their windows while still letting in sunlight.

Window Blinds & Curtains

Window Shades

Window Film

Low-E Windows

Window Inserts

What Are My Options Without Shade Grade?

Indow Shade Grade inserts are not currently available, but we are working to bring them back to help reduce solar heat through your windows.

Shade Grade filtered UV rays and blocked solar heat by 51%. If you are looking for a product that filters damaging UV rays, the Indow Museum Grade inserts reduce UV by 98%. Museum Grade has higher clarity than regular glass, without the green tint of Shade Grade.

With a near airtight seal and improved thermal insulation, all grades of our window inserts have shown to save 20% on air conditioning loads and will keep your home cooler and quieter all summer long.


Shade Grade Inserts in Action

Beth Bryan lives in Alabama and needed a way to block heat from her windows. She wasn’t going to settle for any products that left her in the dark. She wanted natural light in her attic office, but it was also way too hot. “I could roast a chicken in here!” she said before getting an Indow Shade Grade Insert.

window without insert & with insert, showing temps of 91 & 75, respectively: inserts keep heat out

Beth’s attic office cooled by 16 degrees as soon as she added an Indow Shade Grade insert.


Beth works from home, where her office regularly gets up to 91 degrees. It’s well designed, but the west-facing window was no match for the Alabama summer sun. Her blog, Unskinny Boppy, chronicles her DIY home decorating and the pursuit of comfort. There, she shares how to keep heat out of windows and how once the insert was installed, there was an instant 16 degree temperature difference.

“My attic-turned-office is a nice cool place to work now!” -Beth Bryan


Options for How to Keep Heat Out of Windows

Beth was intent on having access to natural light, but there are other window heat blocker options. More information can be found at the Department of Energy.

  1. Window Blinds & Curtains – Blinds, fully closed are pretty effective at reducing summer heat. They are somewhat difficult to control and will let light in between the slats. Window curtains can reduce heat by 33% if multiple steps are taken: the curtains are medium-colored, have white-plastic backings, and remain closed.
  2. Window Shades – Accordion-like insulated shades that can fold up to the top of your window frame. Usually two layers with air pockets in between to increase insulation. About 20% energy savings. Only insulating in the down, light-blocking position.
  3. Window Film – Film adheres to your window glass and comes with many options: tinted, UV-blocking, Low-e, blackout. Their effectiveness depends on their transparency and orientation – less transparent and west/east-facing windows benefit more. This means, less light and loss of view.
  4. Low-E Windows – Low-emissivity coatings reduce heat transference through windows up to 30% – 50%. If you’re interested in replacing your windows, know that low-e windows cost 10% – 15% and the coating lasts 10 – 15 years.
  5. Window Inserts – Inserts or interior storm windows, block heat and UV-rays while allowing natural light to penetrate. Indow solar window inserts add 20% energy savings on average. They have the added bonus of blocking noise.

How to Insulate Windows from Heat with Window Inserts

man installing window insert to keep heat from coming in windows

Indow Is Discontinuing Shade Grade Inserts

Due to a disruption in the supply of solar-heat-reducing and UV-filtering acrylic, Indow will no longer be able to offer Shade Grade inserts. We are working on a replacement product, but because we have yet to identify a new supplier, we will not be able to accept Shade Grade orders.

What Is Shade Grade?

Shade Grade was offered as a premium insert in the Indow product family along with Acoustic, Privacy, Commercial, and Museum grades. 


DIY Window Insulation Saved This Home Office

Beth can now work comfortably in her home office, even when it’s 105 degrees outside. As a DIY home decorating, she especially loves the natural light and how she can barely tell the inserts are there.

If you’re still searching for how make your space more comfortable in the summer, see if Indow window inserts work for your space. This video takes you through how we help to regulate temperature during those hot summer months:


When it comes to working at a desk, be it from home or in an office, excess noise is an even more common problem than heat. Check out our resource for soundproofing office windows to see if our solution is a fit for your space.

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bathroom window ideas for privacy