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 Yes. For 3 winters I heated my home with 3 S9s. I will not be doing that this winter though. It's not worth it after the halving, at least for me. 
 Is the calculation too complicated? 
I first need to get the price of electricity the compare it to other means of heating? 
 Yes. And figure out what your source of heat uses and compare the two. The calculation is pretty easy one you get the numbers. 
 Maybe I do 
 Can you turn those miners on and off depending on the weather?