Super Insulating
Transparent Wood pulp filled double pane windows are coming that will insulate better than walls, reducing energy loss like no others.
Articles on wood-pulp-filled super-insulating windows -
https://www.woodworkingnetwork.com/news/woodworking-industry-news/windows-filled-wood
Updated Jan 2025:
MXenes at 100 to 1000 times thinner than hair do not conduct Infrared radiation (heat). MXene thermal insulation performance, with further development, can exceed all known materials.
https://phys.org/news/2024-12-thin-coating-mxene-material-thick.html