I got an interesting question on my blog post “Quickpost: Electrical Power & Mining“:

Does the temperature in your room increase due to the miner running full blast? Would you turn down the heater to compensate (which may change the calculation slightly).

That was indeed the case: I did turn down the heating in the room, and the heat of the desktop computer made it a nice 20°C.

We heat our home with natural gas, and on that day, we consumed 2,23 cubic meters to heat the rooms in our house, except for the office where the computer was running. Counting the volumes of the rooms, I estimate that 0,55 cubic meters would have been necessary to heat the office.

Using that same spreadsheet, consuming an extra 0,55 cubic meter would cost me €0,55. Deducting this from the €3,91 I had to spend on electricity gives me €3,36, which is still around 10 times more than the €0,39 I earned through mining.