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How to Insulate Your Polytunnel in Winter

Polytunnel Winter Temperature

To keep a polytunnel warmer in winter, you can use heat sinks. These can be made of black or white materials, and filled with water to absorb solar energy and hold onto it. You should place these closest to the plants that require the most heat. Install a thermometer to monitor the temperature. Check the temperature daily to determine when it is coldest. Lower the water in the barrels when the temperature is cold, and remove the water when the temperature is high.

Insulating a polytunnel

Polytunnels are an excellent way to grow plants in winter. They maintain a consistent temperature, even in winter, protecting plants from seasonal pests and harsh weather. In addition to allowing you to grow your favourite seasonal fruits and vegetables year-round, polytunnels can also be used for growing exotic plants and tropical fruits. In order to keep the temperatures in your polytunnel constant, here are a few tips for insulating it.

First of all, it’s important to know what temperature you need to maintain your plants’ growth. You can keep the plants warm with a heater, but this can be expensive and inefficient. Luckily, there are many cheap ways to keep your polytunnel warm during winter. Using a thermometer to monitor the temperature inside is a good idea. It will also help you control the temperature by adjusting the water level.

Another way to regulate the temperature inside a polytunnel is to use a greenhouse cover. These cover materials will help retain the moisture in the soil and protect the plants inside. You can also use a gutter system to collect the rainwater that falls inside the polytunnel.


Proper ventilation is essential for your polytunnel. This will help your plants breathe and prevent them from getting sick. Proper ventilation will also prevent overcrowding. Open the side vents and doors of your polytunnel to allow maximum air circulation.

Ensure the ventilation is properly adjusted twice a day, in the morning and evening. Use a recording thermometer to monitor how much air is flowing into the polytunnel. Ventilation from the side windows is suitable for polytunnels up to 20 metres in length. Louvre and roll-up vents will provide additional ventilation.

Ventilation from the sides will help you regulate the temperature. It is important not to let the tunnel get too humid because this will encourage condensation. The doors can be opened slightly to let in fresh air, but it is important to make sure that the doors are closed during cooler months.

Proper ventilation is crucial to photosynthesis. Plants absorb carbon dioxide and water from the air, and need a steady flow of fresh air to survive. You can add ventilation fans to your polytunnel if the temperature is very high or extremely low. It is also important to adjust the watering schedule to the temperature.

Plants that do well in a polytunnel

While the cold winter temperatures can be brutal on plants, you can still protect them by planting in a polytunnel. The polytunnel’s raised beds provide the necessary protection against frost, so that your plants don’t succumb to the cold. You can also grow a wider range of crops in a polytunnel if you take some special care.

Cabbage and broccoli do well in a polytunnels. These vegetables are resistant to the cold, but they may suffer from pests. A polytunnel will protect your crop from these pests, and they will grow bigger and healthier. Carrots are another example of plants that grow well in a polytunnel.

To maintain the temperature inside your polytunnel, consider adding thermal mass to it. Thermal mass can help keep the polytunnel warmer in the winter and keep it cool during the summer months. Materials with high thermal mass are effective at storing heat from the sun, releasing it slowly at night. You can use these materials as pathways, bed edging, staging, and other structures to create an efficient thermal barrier for your polytunnel.

Controlling pests

A polytunnel is an excellent option for extending the growing season. You can even grow herbs in your polytunnel, which will not only repel pests but will also enhance the growth of other crops. The fact that the polytunnel is a miniature ecosystem means that you don’t need to use chemical sprays to keep your crops healthy.

You can prevent the emergence of pests by keeping the polytunnel dry and aerated. Bugs are attracted to colour, smell, and warmth, so ensure that the polytunnel is well ventilated. Also, you need to keep the temperature even. Creating too humid a temperature will encourage disease-causing organisms, which are attracted to a warm, moist environment. It’s also important to avoid over-watering the polytunnel.

A polytunnel can act as both a cold house and a hot house, creating a microclimate for your plants. If the polytunnel is in a colder climate, it’s best to use a heating system to keep the temperature above 55 degrees F. In warmer regions, you can set the minimum temperature of the polytunnel at 45 degrees F and a maximum of 90 degrees F.