Prof. Junqiao Wu's research group has developed an all-season smart-roof coating that keeps homes warm during the winter and cool during the summer without consuming natural gas or electricity. Research findings reported in the journal Science point to a groundbreaking technology that outperforms commercial cool-roof systems in energy savings. The technology uses a photonically amplified metal-insulator phase transition to switch thermal radiation in response to environmental temperature.

For details, see https://newscenter.lbl.gov/2021/12/16/roof-year-round-energy-savings/