@alxd You can do a lot between solar heating and really good insulation (and body heat) But if it's a cold area, it might (like my area) also be grey a lot of the time, so.
Let's see. Urm, can you put your hackerspace in the subbasement? Then you have a consistent temp.
Servers isn't eco, but I mean, computers start with radiators, can you do something cool with that and rgb and have the space basic-heated by the computer waste heat?
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