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?

Active cooling

Removes heat actively, with a machine or a driven process. Distinct from shading, which prevents the heat arriving, and from moderation by the ground, which uses a temperature difference that already exists.

Solutions

• Night-flush cooling: Opening the house wide on summer nights to let cool air flow through, then closing it in the morning. The cool night air chills the walls and floors, and they k
• Evaporative cooling: A device that blows air across a wet pad or through a fine water spray. As the water evaporates it takes heat from the air, so cooler air comes out. It cools ch
• Heat pump (air- or ground-source), reversible mode: A heat pump that can run in reverse, pumping heat out of the house in summer as well as in during winter. One machine heats and cools, so there is no need for a
• Night-sky radiative cooling: A surface facing the open sky loses heat by radiating it upward, and on a clear night it can fall below the air temperature around it. Circulating water or air
• Ceiling fan: Moves air across skin so sweat evaporates faster and a room feels cooler than the thermometer says. It cools people, not rooms, so running one in an empty room
• Whole-house fan: A large fan in the ceiling that pulls cool night air in through open windows and pushes the day’s hot air out through the roof space. Night-flush cooling done b