As others have said, summer is the problem. Even in the fairly chilly parts of the world where people live, one typically doesn't need to heat ones home in the

As others have said, summer is the problem. Even in the fairly chilly parts of the world where people live, one typically doesn't need to heat ones home in the summer. At least not much, and only on unseasonably cold days. However, people still need year-round hot water for washing themselves and their posessions. That said, I doubt that the summer domestic requirement for hot water is anything like the possible output of an economically scaled data furnace. Instead, I'd suggest heating municipal or club swimming pools and preheating water or air for showers, hammams and saunas at spas and leisure centres. These need year-round heating, even in warmer parts of the world. Another possibility would be to house datacentres in areas of high population density, and pipe warm water from there to nearby homes and businesses. Just like the District Heating Schemes of urban power stations. Both of these latter solutions fix the security, access, and last-mile problems. They can also even out the seasonal demand problem by not attempting to provide all the heat and hot water.