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Polytunnel Temperature

Polytunnel Temperature

Temperature is a crucial factor in polytunnel gardening. High temperatures promote better crop yields. However, there are certain precautions that should be taken to maintain the right temperature. Some of these precautions include shade netting, ventilation and storage heaters. Listed below are some tips for maintaining optimum temperatures in a polytunnel.

High temperatures offer higher crop yields

A polytunnel is an enclosure that provides high temperatures for growing plants. This type of greenhouse can increase the yield of crops such as winter greens and spring salad leaves. The polytunnel is ideal for growing plants that are difficult to grow in the climate of the local area. Because it provides higher temperatures than the average greenhouse, it makes farming easier for smaller scale farmers and can also be used for commercial purposes.

Growing crops in polytunnels can be a good idea even in cooler climates. Temperatures over 35 degrees Fahrenheit are too high to be beneficial for many crops. Moreover, growing plants in hot weather is difficult and can cause plant stress. To avoid such issues, the growers should monitor the temperatures inside the facility and implement necessary measures.

Shade netting

Shade netting is a versatile way to control the temperature inside a polytunnel. Using horticultural shade netting, you can lower the temperature of the air inside your polytunnel by up to 6 degrees. Shade cloth is made of woven polyester or knitted polyethylene strands that decrease light intensity. The most common shade cloth color is black.

Another way to shade your polytunnel is to use shade paint. This is a very inexpensive option but can also be a time-consuming process. However, you must ensure that you don’t leave your polytunnel outside during the summer, or the shade paint will wash off.

Storage heaters

Storage heaters work by storing heat and allowing the heat to be released when required. Many of these units are controlled by an automatic output switch which means they can be left on overnight, and then switched off when they are not required. Some models have controls that can be adjusted throughout the day so that they are always at a comfortable temperature.

There are different types of storage heaters, such as electric or gas, and each has its own advantages and disadvantages. Electric models are safer and won’t pollute the environment like fuel heaters. However, they are expensive to purchase and run. The best option is to get a heater which is thermostatically controlled and can be used when needed.


When you have a polytunnel, you need to ensure that it is properly ventilated. This will help your crops grow better and prevent disease. The temperature inside the polytunnel should not be over 110 degrees Fahrenheit. In addition, it should be well ventilated and have movable windows to allow air to circulate freely.

When determining how to regulate the temperature inside your polytunnel, remember that the plants will be absorbing carbon dioxide from the air. They will also be absorbing water and sunlight. The temperature inside will vary with the weather, so it is important to keep an eye on it. In hotter climates, you can use ventilation fans to keep the temperature lower. You should also adjust the watering schedule to suit the temperature.

Circulation fans

Polytunnel ventilation fans are a useful way to improve the temperature of your polytunnel. These simple devices operate using a pull-cord and spring-closing design to extract excess heat. The fans also reduce the risk of crop diseases by preventing humidity and mould build-up. They are an affordable, practical solution to controlling polytunnel temperature.

When temperatures start to soar, it is essential to use ventilation fans to keep the air moving. This is crucial for photosynthesis, which is a process in which plants absorb carbon dioxide from the air. In polytunnels, fresh air movement is essential to ensure the survival of the plants. To reduce the temperature, the watering schedule should be adjusted accordingly.

Proper foundations

If you’re planning on building a polytunnel, you’ll need to make sure it’s stable. This is important for a number of reasons. Firstly, you need to choose a site that’s relatively level from side to side. If the site is exposed to strong winds, you may want to place an anchor plate on the ground before you start. Secondly, you’ll need to place the foundation tubes at least six feet long. Lastly, you need to choose the correct type of foundation tube for your building.

A polytunnel needs a sturdy foundation to ensure the structure remains stable. This will prevent it from blowing away during strong winds. It also needs a suitable door frame, which can be made of concrete.