It's not really infinite. The return to the heat can be quantified as the cost of other heating avoided. I assume you live in a cold climate. How do control the temperature besides opening the windows when you feel too warm?
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I assume @ragnarokdel gave flat dimensions in feet, so it is around 70 sqm. His rigs use ~6000 kWh per year, what gives ~ 80 kWh per square meter per year. (If my calcs are ok).
For many (in non extreme weather areas) flats / houses you can assume heating demand is at 100 to 200 kWh per sqm.
But gas heating is often ~3 times cheaper than electric heating.
In extreme case when source of heating is grid electricity, roughly you get a net profit equal to mined GRC switching from standards electric radiators / heaters to CPUs / GPUs.
3 generations old pc might use the same energy as a new one and produce 5x less GRCs, another variable to account for (just loose numbers).
We have extreme climates, our houses are really well isolated and the snow also acts as an isolant. Since I live in a basement appartment, most of my surface is either underground or covered with snow in the winter.
Of course it's not actually infinite. but I dont use heating except maybe one or two days a year at those super peak lows (-35°c let's say). I wish it was separate on the bill so I could give you a number but it isn't.
In Québec most building even with water heating use electricity, older houses might be different as for my apartment, it's in a house basement but it's definitely on electricity as well.
As for summer, I dont mine in heatwaves and yes I crack a window open. Being in a basement keeps it relatively cool.