Heater/Bitcoin Miner with Free Electricity

Hello! I know the general consensus I have seen is that the Bitcoin mining heaters are not worth it. I don't have to pay for electricity. Does that change that at all? -noise is not an issue -there is heat in the area, just needs to be supplemented with a space heater when it's cold -I do not have to pay for electricity at all

I have a very limited understanding of how it all works and I find it kind of confusing.