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Thermoelectric cooling: it's not great.

55 videos recommended on HN
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3 HN users recommended this explainer2 months2025 score 2
Years with an HN recommendation, 2007–2026

It is the standard link whenever a new Peltier or thermoelectric cooling breakthrough is posted.

Technology Connections explains in 33 minutes why thermoelectric (Peltier) cooling is far less efficient than compressor-based refrigeration.

“they are _massively_ less efficient.” (HN, 2025)

3 recommendations · 2 citations · Explainers

5 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@tommiegannert Feb 2025 Recommends
on HN thread New thermogalvanic tech paves way for more efficient fridges
> Did peltiers ever get efficient? Not compared to gas compression. For a relaxed take on it: [this video] (Thermoelectric cooling: it's not great) Though part of the complaints about the mini fridge is due to lack of insulation. But he compares it to his usual fridge, which has a similar power draw as this 60W mini fridge, and there's a 50x difference in volume to cool.
Relaxed explanation of why Peltier cooling is inefficient.

Citations, criticism and jokes

@vintermann Sep 2025 Cites it
on HN thread New thermoelectric cooling breakthrough nearly doubles efficiency
Doubles efficiency? From what I understand, the efficiency was pretty lousy to start with: [this video] Aren't there theoretical limits to this sort of cooling too? But, if this innovation causes Technology Connections to make yet another heat pumps video, I'm all for it.
Shows thermoelectric cooling efficiency started out poor.

Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.

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