I was interested but never pulled the trigger. I don’t have long enough sustained need for the heating to justify the cost. Plus, it seemed the general impression was that for the price, the mining hardware was quite dated. Would love to hear some first hand experiences though!

S9 + crypto clocks space heater set up

With me electricity prices it would only make sense to use one if:

Too expensive. It's a huge investment, and the miner will just be outdated in a few months assuming network dificulty keeps increasing like it's rn.