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

Tech Ingredients · 1.4M views · 2023-02-08 · 25:45

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Overview

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.

On Hacker News

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

Recommended by 1 HN people across 1 months · HN mentions 2023–2025

Topics

Power grid, heating & buildingsEveryday physics & science demos
Search by tags
radiative coolingcooling paintpassive coolingdiyair conditioning

What people said

energ8 · 2025-06 · Recommendation

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 [VIDEO] [LINK]

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p1mrx · 2023-11 · Reference

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

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simonjgreen · 2023-07 · Reference

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

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Sources

Video by Tech Ingredients, played through YouTube.

Data and selection notes

HN summaries and labels may contain AI errors. HN dates refer to discussions, not video publication.

HN Library: HackerTube export (2026-10-31) and open-index/hacker-news. Upstream summaries and classifications may contain AI errors.

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