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Keeping Polytunnel Temperature at the Right Level

Polytunnel Temperature

Keeping a constant temperature inside your polytunnel is important for optimal growing conditions. When the sun is out, the temperature inside a polytunnel will increase quickly. This is because the polythene and glass used in polytunnels does not allow infrared rays to pass through and heat builds up. Fortunately, a thick cloud cover will reduce the difference in temperature.

Thermal mass

Thermal mass is a useful feature for polytunnels and greenhouses, as it helps them use the sunlight more efficiently. This is because materials with a high thermal mass can absorb heat during the day and release it at night. This feature can make a difference to the temperature at nighttime, and will help to prevent hard frost in most parts of the world. However, in some colder regions, thermal mass may not be sufficient to reduce nighttime temperatures to an acceptable level.

Thermal mass can be added to a polytunnel in a variety of ways. One of the best ways to do this is to use objects that contain water. These materials are excellent thermal mass, and can help to retain heat during the winter.

Storage heaters

Storage heaters give off heat continuously, either through thermal radiation or convection. They may be equipped with a mechanical fan to move air through the unit. In addition, the units may be equipped with a safety guard. Storage heaters are best installed by a qualified electrician. Most models have control switches on the top or underneath a flap, so that the user can adjust the settings as required.

When the sun is out, the temperature inside the polytunnel will quickly rise. This is because infrared rays cannot pass through polythene or glass and therefore will build up inside the tunnel. The difference in temperature will be reduced, however, if there is a thick cloud cover.

Soil quality

The temperature and soil quality of a polytunnel are controlled by a variety of factors. This includes humidity, soil temperature, and climate. The benefits of growing crops in a polytunnel can be numerous and include protection against extreme heat and bright sunlight, as well as wind, hailstones, and cold waves. Many market gardeners use polytunnels to extend the growing season. This helps them to grow crops that would otherwise be unable to survive in colder climates. The extra time to grow a selected crop will result in a larger yield and higher quality produce.

Another benefit of a polytunnel is that it can reduce the time between planting and harvest. Many of the fruits and vegetables that we buy in the supermarket are grown in polytunnels. These structures are becoming increasingly popular among farmers as a more sustainable alternative to conventional farming practices. Some even use them to grow specific crops, such as grapes. The pH of the soil in a polytunnel is important for plants to thrive. You can check this by using a pH tester such as the Apera kit, which has an accuracy of +0.1.


Polytunnels are structures that let you grow crops in a protected environment. The enclosed environment can be much warmer than the outdoors, but this can benefit your crops. However, it is important to make sure that there is sufficient ventilation to keep the polytunnel temperature at the right level. Proper ventilation will also help you to control humidity levels and overheating.

If you want to invest in a polytunnel, you should be aware of the various costs. The price of the polytunnel will depend on the material used, its size, and the type of materials used to construct it. You can find polytunnels ranging from a few hundred dollars to a thousand dollars, depending on the size and construction.