this post was submitted on 30 Apr 2026
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Most of the heating energy would actually be IR, which many types of window glass will be designed to reflect. It probably depends on what kind of coatings are used. Basically all car windows block IR to help keep the inside of the car cool in the sun.
It’s a silly thing, but if it glows orange, and if any of that orange light escapes or is visible from the window, it is not 100% efficient. But this is just pedantic in reality, even cheap heaters will do a good job of converting electricity into heat.