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The next step in the sequence of environmental control is the greenhouse, where slightly more sophisticated pieces of equipment for environmental control can be used. Greenhouses can, of course, be of a wide variety of shapes and sizes. Wooden-framed greenhouses are expensive to purchase, maintain and keep clean. Metal greenhouses are less expensive, cheaper to maintain and easier to keep clean, but unless they have an adequate internal structure they are subject to considerable distortion and damage if exposed to high-velocity winds.

A closed case, which is a frame with a lid of glass in a greenhouse, provides a high-temperature system for propagation of house plants and less hardy subjects. Accurate control of temperature can be attained by installing a thermostatically controlled soil-warming cable, which will provide bottom heat, into some sand at the base of the closed case.

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Building Your Own Greenhouse

Building Your Own Greenhouse

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