I've been cold in an office at work and ran a stress test on an old laptop which was destined for e-recycling, so that it would blow warm air on my hands.
It wasn't achieving anything doing that work, but it did work well. At least I think the office was cold from not being heated enough, as opposed to being over-cooled in summer. I really hope that was the case!
For some reason, I must have been using the laptop for another purpose too, and I got attached to it and requested that it be wiped and took it home and used it as a daily-driver for years. It was a silly blue Dell E4300, and had a very easily swappable HDD tray so I bought a few different trays/faceplates, and could dual-boot by swapping HDDs in seconds (it didn't really need the screw to hold the tray in place). Bad battery life, but the battery could be swapped in seconds too.
If you don't use heat pump (which can have 300-500% efficiency), whatever you plug into a wall socket will produce heat at exactly 100%. So the real choice here is either monetize what you are doing with electricity or using a heat pump
my friends have been heating their apartments in the winter mining cryptocurrencies. they're not into crypto, in that they don't do it in the summer, it just helps offset the cost in rentals without heat pumps -- gamers who've already purchased the gpus
Dig greedily and too deep (underground is usually cooler, though eventually temperatures will stabilize unless you have ground water circulation or something).
It wasn't achieving anything doing that work, but it did work well. At least I think the office was cold from not being heated enough, as opposed to being over-cooled in summer. I really hope that was the case!
For some reason, I must have been using the laptop for another purpose too, and I got attached to it and requested that it be wiped and took it home and used it as a daily-driver for years. It was a silly blue Dell E4300, and had a very easily swappable HDD tray so I bought a few different trays/faceplates, and could dual-boot by swapping HDDs in seconds (it didn't really need the screw to hold the tray in place). Bad battery life, but the battery could be swapped in seconds too.
https://www.notebookcheck.net/Dell-Latitude-E4300.12612.0.ht...