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Keeping your greenhouse cool during the hot summer months is crucial for the health and productivity of your plants. A holistic approach to cooling is essential, as it involves creating systems that work together to maintain optimal temperatures. By integrating various cooling methods, you can ensure that your greenhouse remains a comfortable and productive environment for your plants.

1. Use Shade Cloth

Shade cloths come in various densities, typically ranging from 30% to 90% shade. Choose the density based on your local climate and the needs of your plants. These cloths reduce the amount of direct sunlight entering the greenhouse, lowering the temperature and preventing sunburn on plants. Additionally, shade cloths are easy to install and can be adjusted or removed as needed.

2. Grow Lots of Plants!

Filling your greenhouse with a variety of plants can create natural shade. Dense foliage helps to cover the soil, which in turn keeps the soil and greenhouse floor cooler. Cooler soil and floor temperatures contribute significantly to reducing the overall temperature inside the greenhouse. Plus, having more plants enhances biodiversity and can improve overall plant health.

3. Add a Water Tank or Rain Barrels

Water tanks or rain barrels can absorb and store excess heat during the day, and as the water evaporates, it cools the surrounding air. Place them inside the greenhouse where they can receive direct sunlight. This method not only cools the air but also provides a handy water source for your plants. Furthermore, it promotes sustainable water usage and helps in conserving water resources.

4. Ensure Vents are Operating Properly

Proper ventilation is vital for maintaining a cool greenhouse. Check that your roof and side vents are functioning correctly. If you have solar-powered vents, like those in Sturdi-Built Greenhouses, ensure they fully open on warm sunny days. If they aren’t, it might be time to replace the power tubes. Visit our webstore to purchase new tubes and other essential parts. Regular maintenance of vents can also prevent mold and mildew buildup.

5. Ensure There is Proper Airflow

Maintain good airflow by opening doors and base wall vents. Use exhaust fans to expel hot air and consider installing jalousie windows for passive ventilation. Proper airflow helps to reduce humidity and prevent heat buildup, ensuring a cooler environment for your plants. Consistent air circulation can also help in distributing CO2 evenly, which is beneficial for plant growth.

6. Use an Evaporative Air Cooler (Swamp Cooler)

Evaporative coolers work by pulling warm air through water-saturated pads, which cools and humidifies the air. These are particularly effective in dry climates but may not be suitable for humid areas. The cooling effect can be substantial, making them an excellent choice for greenhouses in arid regions. They are also energy-efficient and environmentally friendly compared to traditional air conditioners.

7. Use Misting Systems

Misting systems can provide a cooling effect by increasing humidity and lowering temperatures through evaporation. Hang drip kits from rafters to distribute water evenly throughout the greenhouse. This method helps to cool the air and can be particularly effective during the hottest parts of the day. Misting can also help in keeping pests at bay and reducing plant stress due to high temperatures.


By implementing these strategies, you can create a more comfortable and productive environment for your plants, ensuring they thrive even during the hottest summer days.


Happy gardening! 🌞🌿

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