My guess is that heating-by-CPU is less cost effective than baseboard electrical heating which is already one of the least cost effective heating methods: http:

My guess is that heating-by-CPU is less cost effective than baseboard electrical heating which is already one of the least cost effective heating methods: http://www.efficiencymaine.com/at-home/home-energy-savings-program/compare-heating-options/ http://www.efficiencymaine.com/at-home/home-energy-savings-p... Also, depending on the setup of your HVAC system, it may be possible to cause a lab to overheat and trigger the cooling system in the middle of winter. Many datacenters vent excess heat year-round. The absolute pittance of bitcoins you'll mine using CPUs won't begin to make up for these inefficiencies. Edit: s/efficient/cost effective/g