I'm cold and want a C# program to best raise the PC temperature so fan outputs more heat but don't want windows to lock up. I've looked for USB desk heaters but best I have found is a mug warmer. Unfortunately boss's tight and do not allow personal heaters!
I personally used to run Graphics card bitcoin mining rigs, and later ASIC mining rigs to heat up my home (lived in a boat!) and worked wonders in the winter, save on heating costs and making money!
Now though you need very cheap electricity to run bitcoin miners to turn a profit.
Personally i think you should go for a pair of these https://www.amazon.co.uk/USB-Heating-Slippers-Comfort-Warming/dp/B005PJMGU8