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Greenhouses are heated with electricity, gas, oil, L.P. gas or solar energy. Each has its good points and its bad.

Electrical heaters tend to be least expensive. Small, portable units, they are easy to install but expensive to use, often creating pockets of heat. Besides standard heaters, you can use soil heating cables or infrared bulbs directly above your plants. They supply an even, constant warmth to mature plants, cuttings or seedlings.

Gas or oil heaters are useful for larger greenhouses, but such units take up quite a bit of room. In general, they are less expensive to operate than electric heaters, but fans are needed to keep the warm air circulating.

Solar heaters take care of most greenhouse needs for growing vegetables at no operating cost as long as there is adequate sun. In most cases, they would need a backup heater for use on very cold nights and during long periods of overcast. Doubtless, technological advances will remedy this in the near future.

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Building Your Own Greenhouse

Building Your Own Greenhouse

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