WALIPINI/PIT GREENHOUSE
The walipini greenhouse is alternately called a pit greenhouse because it is built underground and framed in with cement walls. The underground position of the greenhouse makes use of natural cooling, which is a cost saver during the hot summer months. This is a better option in southern states where snow is infrequent and heats can be extreme. A building permit may be required. The pit greenhouse receives poor natural light in the morning and the evening. Since the roofline is at ground level it is easy for dogs, livestock, or humans to walk on and damage the roof or even fall into the greenhouse.
PASSIVE SOLAR HOUSE OR LEAN-TO GREENHOUSE
This type of greenhouse attaches directly to the side of the house, shed, barn, or other structure. This provides extremely good energy efficiency because the north wall is adjacent to a heated source. Since the roofline is a lean- to style, the snow slides off easily. It is a good design for the hobby greenhouse user. The lean-to greenhouse may need a building permit and be considered additional square footage for taxes. Because it is not free standing, it will likely only receive mid-day sun. Passive solar houses are difficult to add on to so this design is not good for larger operations. These greenhouses often use barrels of water stacked in the corner to collect heat during the day and release it during cooler nights. In an already smaller space, the barrels take up valuable floor space.
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