All-season smart-roof coating that keeps homes warm during the winter and cool during the summer without consuming natural gas or electricity
https://newscenter.lbl.gov/2021/12/16/roof-year-round-energy-savings/
"temperature-adaptive radiative coating or TARC – can enable energy savings by automatically turning off the radiative cooling in the winter, overcoming the problem of overcooling... With TARC installed, the average household in the U.S. could save up to 10% electricity... This ability to switch from one phase to another – in this case, from an insulator to a metal – is characteristic of what’s known as a phase-change material"
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