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: https://www.youtube.com/watch?v=MFEHFsO-XSI 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 https://www.youtube.com/watch?v=CGAhWgkKlHI Old-fashioned rice cookers are extremely clever https://www.youtube.com/watch?v=RSTNhvDGbYI Reusable handwarmers that get hot by freezing https://www.youtube.com/watch?v=Oj0plwm_NMs I also made passing references to Forced-air Furnaces: The What, Why, and How https://www.youtube.com/watch?v=lBVvnDfW2Xo and Portable Air Conditioners - Why you shouldn't like them https://www.youtube.com/watch?v=_-mBeYC2KGc If you'd like to learn about Ground Source (Geothermal) heat pumps, you can check out this video https://www.youtube.com/watch?v=7zrx-b2sLUs Technology Connextras (the second channel that stuff goes on sometimes): https://www.youtube.com/channel/UClRwC5Vc8HrB6vGx6Ti-lhA Technology Connections on Twitter: https://twitter.com/TechConnectify The TC Subreddit https://www.reddit.com/r/technologyconnections This channel is supported through viewer contributions on Patreon. Thanks to the generous support of people like you, Technology Connections has remained independent and possible. If you'd like to join the amazing people who've pledged their support, check out the link below. Thank you for your consideration! https://www.patreon.com/technologyconnections And thank you to the following patrons! Christopher Beattie, Help I'm trapped in a driver's license factory Roberts, Samuel Kirzner, Daniel Pritchard, Brandon Tomlinson, Eric Loewenthal, Jeremy Samuels, Malcolm Miles, David L Jones, Matthew Burket, Andrew Roland, Smith8154 , Kenneth Siewers Møller, jacob kamphaus, Slysdexia , HurleyPotter, Tommy McCarthy, Andrew Bobulsky, On Ice Perspectives, TheGreatCO , Petteri Hjort, Daniel DeLage, Nathan Obuchowski, Shaun Puzon, Bret Holmes, Vlycop, Casey Blackburn, Devon Hodgson, Zimpan , Filmmaker IQ, Jan Houben, Bren Ehnebuske, T.J. Zientek, Vernon , Ton Brands, Scott Wright, Kory Howard, rezonant , Thanasis Dimas, Adam Quartarolo, Marc Grondin, HexTheDragon, Craig Kollai, Daniel Barrera, Mark Stradling, Peter Sodke, Dee Dub, joseph , Kristian Scheibe, BigMcLargehuge510, Andrew Liendo, Nick , The Masterpiece, Sterling , Chris Cody, Jason Portwood, Chad Fertig, Joseph Houghtaling, Ben Tucci, Josh Braun, Joe Johnson, Daniel Dugger, Christopher Lowell, Oleg Korsunskiy, Michael Sacchi, Ali Elam, Dan Allen, Zhenbang Xiao, Jason Watson, Markus Towara, Barky doggo, Ectra , Martin Embeh, Reid Fishler, Daniel Meagher, Joel , Clemens , Bill Bates, Centronias , Dennis Walsh, Alex Warren, Paul Robins, Michael Gernoth, CanyonMID , Les , Keenan Finucan, Ian Clanton-Thuon, Ryan Pratt, Paul Newton, Greg Golds, Theo Keeler, Tyler Alberico, Ben Ratner, WildMartin, Paul Sharp, Craig Brickey, Zidy , Brandon , Karl Kornel, Danila Fediashchin, Adam , Patryk Majewski, Ryan Kamphuis, WB , AmbientCyan , Sam Calandra, Wolfgang Gschwendtner, Józef Sokołowski, Will Preston, Christopher Olson, RexRath, Kor Nielsen, Stephen Amar, Bryce , Andy24x, David Jeroslow, Charles MacDonald, Tim Jones, Crisco762 , Phil E, AnsulFolf , Jack Mudge, Raymond Coutts, Ian Spence, John De Witt, Mike A, Alex Dodge, hipp1eguy , Justin Derleth, El Jefe, NEON725 , Emily Eisenberg, Mark Christian, Dylan Leblanc, Bard , Megan Lovett, LGR, kn0tsin , David Wulff, FirstWizardZorander, Michael Riegel, Paul Kavanagh, Isaac Clarke, Sean Hearrell, selectric, Keithius , Julian Haldenby, Seb Bacanu, Mauricio , Hunter Thornsberry, Austin C Borger, Gabe Cook, Anapan, Hodgkin LeBlanc, Michael Patron, Sonic Ether, mike quick, Calisto, Adam , Lucas , microserf , Daniel Kraut, John de Largentaye, Luka Sanzin, Peter Hillier, PeterH , William Holt, Ethan Hamel, Grant Campau, Else , Michael Dunn, Kenny, Richard Hicks, Atlas Pup, Levi Maaia, Mike Roach, Simon Janssen, Jorge Caballero, Matthew Schwartz, gs , ashka , Mr. Yan, Matthias Feist, RedR0ze , adan c, Thomas Fuchs, Markus Wüst, Alan Holland, Dan Boulden, Phiroze Dalal, Devin Rosenthal, Ray Hardman, G Cowell, Kevin Hamilton, Chase Tarson, Chris D'Arpa, Marshall Kurtz, Matt Goldman, Hurf Durr, shaun morris, Miguel Gonzalez, Bryce Ontiveros, Kenneth A Cusson, Johnathan Reale, Charles Corbin, Simon Arrow, Brett Walton, Martin Schröder, John Van Atta, lakewalk3r , Hayden McAfee, Dan Maku, Mark Injerd, Paul Demers, Michael Sandler, Jacob Harrington, Clay , Benjamin Deming, Thorbjörn Meyer, Eben Lowe, M1GEO , Michael Kaegler, Chrno , Colin Macdonald, Shlomi Borovitz, Krispin, Jan Borcherding