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?

Zoned / selective space conditioning (heating/cooling only occupied or active spaces)

Conditions part of the house rather than all of it, so the question is where the heat goes rather than how much is made or kept.

Solutions

• Zoned radiant or convective heating circuits: Heating split into separate circuits for different rooms or zones, each with its own thermostat or valve. Rooms nobody is using can be left cool while the other