We're conducting a non-scientific experiment on the new greenhouse. To potentially reduce fuel consumption, we've trenched a slot around the perimeter of the greenhouse walls. Then, foam goes in the trench and gets back-filled in place. The theory is that this will keep the frost/cold from encroaching into the interior soil near the walls.
Heating is overhead with forced-air so I thought there might be the potential to have frost in the corners even when the main air volume is 65°F. Then, the heating system is essentially working against an ice-cube with near infinite thermal capacity (outside).
All that said, the difference may be negligible against the losses out the roof and walls but I thought we'd give it a shot. The lady we bought the greenhouse from said it ran about 100gal. of propane a week for her, so that's our only data-point (hence non-scientific). At that burn-rate, anything has to help!
The trench at the far-left of the picture is for the electrical service to the greenhouse and the trench at the bottom is for the propane line.
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