There are several ways to think about it.

For me I started mining to learn. It’s changed and profitably comes from efficiency + cheap power rather than raw hashrates.

Supplementing heat, as a plug in space heater makes sense - you get the margin from the $ you would spent on power.

I’ve added a fan to the HVAC and am about to add a S-19 Pro Loki Urlacher. (Bigger medium power ASIC miner) to the mix. The more it runs the less the furnace does. It’s break even mining but the money I spend on power ends up in my BTC wallet 🥰