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How Do Greenhouses Stay Warm In Winter?

The temperature in a greenhouse can vary greatly during the winter months. Depending on your location, you may need to use an additional heating system or insulation. In milder areas, passive heating may be sufficient. If your greenhouse is attached to your home, the temperature in your home will change as well. If you want to keep your plants warm during the winter, consider insulating the greenhouse with frost fabric or bubble wrap.


During the winter months, you can use various heating systems to keep your greenhouse warm. These systems include boilers and furnaces, which can be placed inside or outside the greenhouse. However, you must make sure that the structure has a good foundation in order to place them. Some furnaces require a special foundation, while others may require an additional layer of concrete or asbestos.

Solar panels are another option to heat your greenhouse. The panels can be installed along the length of the greenhouse or under the roof. The heat generated by these panels heats up the soil, plants and room. Solar panels have a high efficiency and can be placed on the roof, walls or floor of the greenhouse. Solar panels are cost-effective and environmentally safe. Moreover, you can use them in conjunction with other heating equipment. However, they consume a lot of electricity.


Proper ventilation is essential for greenhouses to maintain a comfortable temperature. This helps prevent mold and mildew, which are harmful to plants. You can open windows and doors to improve air circulation. The optimal temperature will depend on the type of plants and the temperature outside. Close the door at night, though, to retain heat.

A good ventilation system includes both fresh air inlets and exhaust fans. They are connected to a thin plastic tube running the length of the greenhouse. The tube has holes along its length, allowing fresh air to flow through. As the tube fills, the fresh air will mix with the warm air in the greenhouse.


Insulation in greenhouses in winter can keep temperatures from falling too low and prevent plants from wilting. Foam and fiberglass insulation contain tiny spaces that trap air and form barriers against heat flow. In a greenhouse, this air layer provides four to six times the insulation of an air layer outside the greenhouse.

You can purchase thermal insulation foil at your local hardware store. This type of insulation foil contains bubbles of plastic between two layers. It helps to reflect heat and light back into the greenhouse. Once fitted, cut the foil to the right length and attach one sheet at a time.

Thermal mass

Thermal mass materials are dense materials that absorb heat during the day and release it at night. Water is one of the most popular thermal mass materials and it has the highest heat capacity per volume. Moreover, it is very inexpensive. The only requirement is a container to hold water, which is available in most households.

Thermal mass materials are also used in greenhouses to retain heat in winter. These materials include decomposing organic matter and animal dung. These materials can be used to create compost that will preserve heat in the greenhouse. They should be placed near the north wall of the greenhouse for maximum effect. The warm air that is reflected from them is ideal for tender plants. Other materials that can double as thermal mass include concrete, stone, pavers, and soil from raised beds.

Water barrels

If you’re looking for ways to keep your greenhouse warm during the winter, you’ll be happy to know that there are a number of alternatives. One of these is using water barrels, which act as heat sinks and absorb heat from the air. To maximize the amount of heat absorption, you should paint your water containers black, to prevent heat from escaping. You can also use other methods to keep your greenhouse warm, including the use of electric room heaters.

Another common method of keeping greenhouses warm in winter is to place large water barrels in your greenhouse. In smaller greenhouses, you can place one-gallon plastic jugs filled with water among your plants. You can paint the jugs black if you wish, and you can even add black food coloring to the water for increased heat absorption. Alternatively, you can paint a 55-gallon barrel black and place it in areas of the greenhouse that get direct sunlight. The water inside the barrels will absorb heat from the sunlight during the day, and will release that energy throughout the night.

Wood stoves

Wood stoves can be an excellent way to keep a greenhouse warm in winter. They are extremely effective at keeping greenhouses warm, and they are also easy to maintain. However, they can be difficult to start, and you will need to start a new fire frequently. Despite this, wood stoves can provide a lot more heat than most other heating appliances.

Wood pellet stoves are a popular choice for heating a greenhouse. They can be equipped with a hopper for automatic feeding of pellets. You will need to make sure that the stove is properly installed so that smoke is not generated. Another option for greenhouse heating is thermal mass. This method works by storing solar heat energy and releasing it at night. Natural materials like rocks and cement blocks absorb heat well.