Regarding the Technology Connections, he has a second video (on his second channel maybe) where he gets into the numbers about specifically WHY it works so well for him and why it may not work for others.
If you haven’t seen it, it might be worth watching.
ETA, I think this is what I’m thinking of. I could be wrong. I’m quite sure he’s spent time talking about heat pumps in other videos as well (in fact, something to keep in mind is that as thorough and generally unbiased as his videos are, he is a bit of a heat pump fanboy).
I only skimmed through it quickly, but the one I’m thinking of is when he gets into how much he pays for electricity throughout the day and why he can heat/cool his house mainly at night instead of all day.
