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    Air Conditioning isn't free... but we're close.

    Tech Ingredients

    1 HN recommender · recommended in 4 months, 2023–2025

    YouTube

    25:45 · 1.4M views · Feb 8, 2023

    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.

    HN points to it in threads on radiative cooling as a hands-on explanation of passive daytime cooling.

    Earth, Energy & EnvironmentPower grid, heating & buildingsEveryday physics & science demos
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    4 comments from Hacker News

    1. @energ8Jun 2025· in “NASA's Voyager Found a 30k-50k Kelvin "Wall" at the Edge of Solar System”

      It's a thing in from thousands of years ago [LINK] and today [LINK] for PDRC there are a couple good videos about it from NightHawkInLight [LINK] , [LINK] and Tech Ingredients this video [LINK]

      RecommendsView on HN
    2. @simonjgreenJul 2023· in “Making Radiative Sky Cooling Paint (With Novel CaCO₃ Microsphere Synthesis) [video]”

      There is a detailed example of this uploaded a few months ago here this video [In fact, I just noticed the author of the OP video posted on this one]

      CitesView on HN
    3. @jcimsMar 2023· in “Just How White Can White Paint Get?”

      >Only active cooling can cool anything below the ambient temperature. Not exactly: [LINK] Couple of videos explaining the effect [LINK] this video

      CitesView on HN
    4. @p1mrxNov 2023· in “Passive radiative cooling ceramic with high solar reflectivity”

      That problem can be solved by adding a mirrored ring around the cooling surface, so it can only "see" the sky: this video

      CitesView on HN