They use a similar method in that thermal mass is used to store energy, but instead of trapping the heat with soil/straw for a season the daily heat is stored in masonry, stone, or water. On sunny winter days it can be -20°F outside while the greenhouse is 80°F, though a string of dark days can mean that supplemental heating is needed.
They use a similar method in that thermal mass is used to store energy, but instead of trapping the heat with soil/straw for a season the daily heat is stored in masonry, stone, or water. On sunny winter days it can be -20°F outside while the greenhouse is 80°F, though a string of dark days can mean that supplemental heating is needed.