Yeah the calculus on that becomes tricky when you have heat pumps since the coefficient of performance is >1 vs resistive heating (often 3-4 depending on the temperature).

I used a rack of GPUs to heat my house for a few years back when gpu mining was decently profitable, and my electricity bill was 3-4x more than with the heat pump - so you have to keep a close eye on the math when you're running at/under profitability.