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It's so cold that it's hot.
Hey! So there have been a LOT of developments in the air-source heat pump space. A replacement for Part 2 is now live:


I referenced a lot of old videos in this one. Here they are, in clickity linkity form!
Chest Freezers; What they tell us about designing for X

Old-fashioned rice cookers are extremely clever

Reusable handwarmers that get hot by freezing

I also made passing references to
Forced-air Furnaces: The What, Why, and How

and
Portable Air Conditioners - Why you shouldn't like them


If you'd like to learn about Ground Source (Geothermal) heat pumps, you can check out this video


Technology Connextras (the second channel that stuff goes on sometimes):


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