Connect with us


How To Keep A Polytunnel Warm In Winter

How To Keep A Polytunnel Warm In Winter

In order to keep a polytunnel warm in winter, there are several options that you can try. These options include ground-source heat pumps and insulation. You should also try to keep insects out of the polytunnel. If these options don’t work, you can also consider a ground-source heat pump.

Ground-source heat pump

Heating a large polytunnel in winter is an expensive luxury, but it can keep your plants alive until spring. There are a number of ways to do this. One way is to use a composting system to create heat. The decomposing materials in compost will generate heat and this can be transferred into the soil. Another option is to install a ground-source heat pump. This system will extract heat energy from the ground below the greenhouse.

Another alternative is to use solar heating panels. Although these don’t work for electricity generation, they do work to heat water. You can use this same technology to heat a composting system. In these systems, you will use a system of pipes laid beneath the soil. The pipes will then carry the heated fluid to a system inside your home. You can install one of these systems in a polytunnel to keep the soil warm year-round.


There are a number of ways to insulate a polytunnel. You can use bubble wrap and fasten it with string or cable ties. Make sure the bubble wrap is UV stabilised. This will prevent it from deteriorating and reduce heat loss.

Another way to insulate a polytunnel is to place large rocks or stones in the corners of the polytunnel. These can absorb heat during the day and release it during the night, keeping the polytunnel a few degrees warmer. For even more protection, you can use a mini greenhouse and place it inside the polytunnel.

If you want your vegetables to survive the winter months, it’s important to make sure that the polytunnel is insulated. A polytunnel that is only partially insulated will end up compromising the plant growth and the harvest of the crop. It’s important to note that the insulating properties of a polytunnel will be much higher if you use reinforced polythene.


The winter months can be harsh on plants and crops, and heating a polytunnel can help keep it warm. You can place large rocks at regular intervals on the sides of the polytunnel to help absorb the sunlight and retain it. You can also add candles to increase the temperature.

Another simple method of heating a polytunnel in Winter is to light candles. Candles are an inexpensive way to warm up your polytunnel and provide warmth without causing damage. Candles can be placed in pots or soil. Candles give off a surprising amount of warmth. Small polythene tunnels and cloches can also be used as double insulation, preventing heat loss and keeping plants warm.

Another cheap thermal insulation method is straw mulch. This material is widely available in rural areas and can be used inside the greenhouse. Spread evenly on the ground, it will keep the area warmer on cold nights and cooler during hot days. However, it is important to check if the material will harm the plants you are growing, and if so, which ones.

Keeping insects out

The best way to keep insects out of a polytunnels is by ensuring it is well aerated. Insects will be attracted to warmth and scent, so ensuring the floor is well drained and removing any creepy crawlies that you notice is vital. Also, you should keep a layer of netting over the doors to deter caterpillars and butterflies from laying eggs in your polytunnel.

When deciding what plants to grow in your polytunnel, consider what kind of plants will thrive in your climate. Tomatoes need extra heating and humidity to grow, so plant them in a soil rich in organic matter. Other plants that thrive in the polytunnel include cucumbers and artichokes, which create a vertical structure.

Insulating a polytunnel

If you want to keep your plants alive and thriving in the winter, you need to properly insulate your polytunnel. The best way to do this is to use frost fabric, which helps to retain heat while allowing irrigation to flow freely. You should also consider installing a polytunnel heater to keep your plants warm and protected from the cold. You can also install a digital thermometer to keep an eye on the temperature inside the polytunnel. In addition, you should also allow for adequate ventilation to prevent overheating.

Another way to maintain a cool and comfortable temperature in your polytunnel is to install a shade net. This is a great way to reduce the temperature inside your polytunnel, and also allows rainwater to filter through. You can fix this net to the roof using cable ties. You can also place a mist or damp path to reduce the temperature inside the polytunnel.