- Greenhouses are primarily heated by the sun's rays. In order to take advantage of that natural heat source in the winter, the greenhouse should be located on the south or southeast side of a building, suggests University of West Virginia.
- Greenhouses need to be insulated during the winter. The University of West Virginia recommends using a 220-volt electric heater to accomplish this task.
- Another key factor in temperature control is air circulation. In winter, a small fan should be present to circulate the heated air around the greenhouse.
- According to the University of West Virginia, ventilation is important for controlling greenhouse temperature, removing humidity and providing adequate carbon dioxide to plants. An exhaust fan is ideal for ventilation.
- The actual winter temperature for the greenhouse varies greatly on the type of plants grown. For instance, tropical plants should be kept at a temperature of at least 60 degrees Fahrenheit at night, and at least 70 degrees Fahrenheit during the day. Non-tropical plants can handle colder temperatures, but ideally will be kept at a temperature of at least 50 degrees Fahrenheit.
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