expanding greenhouse heating, gat system

expanding greenhouse heating, gat system. yes our soil is pure sand, makes digging easy. so now there’s about 50 ft of this under the floor, and 400 ft of drainage tile. it’s an effective way to get about 5 degrees C of warming at night, and during the day it helps cool by drawing in hot air by the ceiling and circulating it underground, storing the heat in the ground like a battery. #greenhouse #climatebattery