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I heat my home. The difference between heating via compiling my kernel and heating via whatever heating you use is almost certainly negligible. But I get a custom built system out of it too.

I don't cool my home, though.

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The difference between a heat pump and resistive heating is certainly not negligible.

Well, even if everyone did have heat pumps, let's think about it a bit. I upgrade my system about once a week. I reckon on average it's about 1 hour of compiling per week but let's say 2 to be safe. That's no more than 1 kWh per week. A fridge-freezer will use that in a day. An electric oven will use that in 15 minutes. An electric car will use that travelling 3-4 miles. Most households use something like 30 kWh per day to heat. Even if a heat pump made that like 10 kWh it's still a drop in the ocean. And don't forget the resulting binaries run slightly more efficiently because they are compiled specifically for my CPU, plus I enjoy it.

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