Questions for ‘Think of this new tech as sunglasses for our windows’
![a gloved hand holds a piece of glass up against a building and a blue sky, showing that the glass tints the objects behind it orange](https://www.snexplores.org/wp-content/uploads/2023/03/1440_sunglass_windows_feat.jp_-1030x580.jpg)
This clear window coating keeps rooms bright and cool. Most visible sunlight passes right through, as shown in the top left. At the same time, the coating absorbs invisible, heat-raising sunlight and radiates it into outer space.
Adapted from S. Kim et al/ACS Energy Letters 2022