Constructed from either plastics or glass, solar greenhouses absorb
solar energy and keep in inside - especially in the Northern hemisphere
sun exposure can be limited, especially in winter, and a greenhouse
allows one to make the most of what energy is provided.
The amount of energy trapped by the greenhouse is important to regulate
– it is possible to overheat plants in the summer and in winter
precautions must be taken to keep heat from escaping:
• Since passive solar heating relies on the sun, it is important
to ensure the greenhouse receives as much direct sunlight as possible.
In higher latitudes the north faces of structures may receive only very
little sunlight.
• Concrete, brick or rocks on the northern exposure, as well as
dark ceramic flooring, will store energy that has been absorbed.
• If there are only a small number of plants in the greenhouse,
containers filled with water may increase the amount of energy retained.
• The south facing wall is generally glazed in order to maximize
energy retention - in addition, the north wall may be insulated to keep
heat from escaping. Additional insulation may be placed over the entire
structure during nights and winter to prevent further heat loss.
Solar greenhouses can be constructed freestanding, or, if space is at
a premium an attached greenhouse is an ideal solution.
