Running three S9’s, underclocked with fan upgrades, as space heaters.   We have a natural gas furnace and I calculated at my current rates for gas and electricity it is 3 times for expensive to heat with electricity.  There is the benefit of some non-KYC sats, and setting back the temperature on the thermostat for the natural gas furnace.  Helping secure and decentralize the network with a minuscule amount of hash power not included in the top three mining pools. The best part is the ability to talk about bitcoin when people come to our B&B as ask; “What is that?”