Air Conditioning isn't free... but we're close.
What it is
Tech Ingredients shows how to build a liquid panel with a specialty paint that, placed outside, cools below ambient air temperature. It demonstrates radiative sky cooling.
Why Hacker News recommends it
HN points to it in threads on radiative cooling as a hands-on explanation of passive daytime cooling.
- 1 people recommended it
- 1 different months
- 0 strong recommendations
- first 2023, last 2025
What HN commenters said
“there are a couple good videos about it”
Good video on passive daytime radiative cooling
energ8, 2025-06 · Recommendation · in “NASA's Voyager Found a 30k-50k Kelvin "Wall" at the Edge of Solar System”
Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.
Topics: radiative cooling, cooling paint, passive cooling, diy, air conditioning
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