i haven't started but my grandpa told me about making a fridge without electricity, like houses here used to have before electricity & cars came during the middle of the 1900-hundreds.

the concept is a large pipe going between the fridge-room, deeper below the ground and out several meters away from it, then up into the air in a stand-alone chimney. insect-nets on both sides of the pipe.

concept is: when the air is hot the earth deeper below cool. air that travels through the pipe turns cool and flows into the space.