Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?

Ground-source temperature moderation (earth tubes, buried pipes, earth-sheltering)

Uses the stable temperature of the ground as a source or a sink. Distinct from active cooling: the temperature difference is free and pre-existing, even where a fan or pump moves the medium.

Solutions

• Earth tube / ground-coupled air pre-conditioning: A pipe buried in the ground that fresh air passes through before it enters the house. The ground a metre or two down stays at a steady temperature, so the air c
• Earth-sheltered / semi-buried form (thermal stability): A house set partly into the ground, with earth against some walls and sometimes over the roof. The ground stays at a steady temperature, so the walls it touches
• Ground-coupled hydronic cooling loop (buried pipe + radiator): A closed loop of water pipe buried about 1.5 metres down, where the ground stays around 12 to 15 °C, pumped through an old car radiator with a fan indoors. The