Smart windows developed in the Netherlands keep heat out automatically

Dutch researchers have created "smart windows" that automatically adjust to keep buildings cool during hot weather. Developed by TNO in collaboration with institutions like UHasselt, these windows feature a thin, transparent coating containing smart materials. This coating senses external temperatures and begins blocking heat when the temperature exceeds 21 degrees Celsius.

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The smart windows have a thin extra coating. That is a layer of transparent paint containing smart material that senses whether the temperature is high or low. As soon as it is warmer than 21 degrees, the windows will block the heat.

Unlike simply closing blinds, this technology does not darken interiors or affect plant growth, as it specifically targets infrared radiation from sunlight. The effect is significant, potentially lowering indoor temperatures by up to 5 degrees Celsius, which could reduce the need for air conditioning. In winter, the windows work in reverse, allowing more heat to enter and reducing reliance on heating systems.

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You will not see anything of that switch yourself. The glass will not suddenly darken. The window will only block the infrared part of the sunlight. Your plants will still get enough light.

Researchers estimate that this technology could lead to energy savings of 5-9% for households. While the smart coating cannot be applied to existing windows, requiring new installations, the added cost is expected to be recouped within 5-7 years. Following successful trials in test buildings, the windows have now been installed in occupied homes, with researchers aiming for commercial availability by next summer.

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Thanks to our smart windows, it can be up to 5 degrees cooler in your home. Even for people who have air conditioning, that is interesting, because you will need to turn it on less often.