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months. Electric heaters are the most the common type. This is because propane or oil heaters require the installation of an efficient ventilation system if you want to avoid stunting the growth of your plants. Furthermore, ventilation is also vital during the hottest months if you want to keep from scorching your plants. Providing good ventilation would seem to be a very good idea. A further prerequisite for wpc green houses is that they should be oriented to face east/west in order to capture the greatest amount of sunshine during the winter months. In addition, you should consider the direction of the prevailing wind. If the prevailing wind blows principally from the west, you will need to make sure your door opens to the east to avoid blasting your plants with cold air every time you go in to do a spot of gardening. There are roof vents on the market that require no electricity, which is useful if your wpc green house is a long trek from the nearest power supply. A typical system employs a simple hydraulic arm. As warmth in the greenhouse builds up, the air " , "
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