It's an intriguing idea, mainly because it's being done in a limited way already by some. I have only six hardware servers in the basement, running some 20 VMs

It's an intriguing idea, mainly because it's being done in a limited way already by some. I have only six hardware servers in the basement, running some 20 VMs and 20 TB of backup disk, connected to the Internet through fibre. They only use about 500-600W, mainly idling most of the time, which is under 5kWh/year in electricity. Total house power use is about 28-30kWh/year. We use a heat pump for heating and hot water, which takes heat from two 100m boreholes. Which probably gives us about 2.5W of heat for each 1W of electricity it uses. We live in a moderately cold climate and the power use is about average for the size and age of house. The biggest issue may be the local IP infrastructure as we only have 100 Mbps delivered ($50/month non-commercial use, $750/month commercial) and a 2 Gbps local loop for thousands of households. I could get an upgrade to 1Gbps to the door (or basement) but haven't really needed it so don't know what the cost would be, particularly if the load was constantly high. I could imagine the price would go up. Not sure the economics of it would stack up, but maybe.