First (and only for over a decade) would be iPod shuffle. Best is my M1 Air. Absolutely ridiculous how much battery life and performance you can get out of it. Starting to wish I’d gotten more than 8 GB of memory (curiously, bloated JetBrains IDEs run fine, web browsers cause more issues) so I might pass it on to my mom when M3 comes out and upgrade to 16 or 32 GB.
Problem with geothermal is that it costs like 20k EUR all-in to get it installed. Regular air to air heat pumps are better for your average person because they’re way cheaper, work most of the time, and also work as air conditioning.
Either way it’s better than gas though. But power grids in many countries haven’t been built to handle it, so the change from gas to heat pumps needs to be gradual (though I do wish it was faster).