Hi there, I have a question about super cheap air conditioning. We have a 3 story house. Regular air conditioning usually need lots of energy and we all know, that is not good for the planet. The temperature under earth (from about 5m) is pretty low (about 10 celsius). in summer this is much colder than outside air. Is it feasible to put a 15m tube under garden and guide the air into the house? the energy consumption for moving air is much cheaper than for actually air conditioning. In winter you could also use that air to for the heating, because it woiuld be warmer than outside air. Is there a system available for this? via /r/DIY http://ift.tt/2rrfqQR
