6 Tips to Cool a Garden Greenhouse without Electricity

For gardening enthusiasts, a greenhouse is a haven for nurturing plants, especially during the colder months. It offers an ideal environment for growth. Yet, when the warmer season arrives, the lack of proper temperature control can severely hinder plant growth or even kill plants, especially those sensitive to heat.

The market offers a variety of cooling technologies for greenhouses, from advanced automated systems to basic ventilation. However, these solutions typically require electricity. For greenhouse owners looking to save on energy, cut operational costs, or those in areas with unstable power supply, finding an effective cooling method that doesn’t rely on electricity is key. With a growing focus on sustainability and eco-friendliness, more people are choosing greener methods to manage their greenhouses.

This article will cover several electricity-free ways to keep your garden greenhouse cool. We’ll look at everything from natural ventilation and shade cloths to water cooling systems and plant shading. We aim to offer practical solutions to help your greenhouse stay cool during hot spells and ensure your plants thrive.

Open Your Greenhouse for Enhanced Airflow

Creating openings to enhance air circulation is vital for small greenhouses. Using natural wind and the principle that hot air rises can cool your space effectively. Consider wind direction and strength when strategically planning your greenhouse to strategically place windows and roof vents for optimum airflow. Vents on the side and top facilitate fresh air intake and hot air exit, respectively.

Hot air naturally rises, making top vents crucial for letting it escape. Cooler air then enters through side windows, reducing indoor temperatures. Unlike automated greenhouses, you must manually adjust these openings based on the weather. Increasing vent size on hot or windy days boosts ventilation; on calmer days, decreases it. To keep pests out, consider adding insect screens to these vents.

Shade Your Greenhouse with Cloth

Shade cloths effectively block direct sunlight, lowering greenhouse temperatures and protecting plants from heat stress. They also slow down moisture evaporation, helping to maintain humidity levels, which is crucial in hot, dry climates. Among the various materials and shading percentages available, UV-stabilized HDPE shade cloths by INSONSHADE are notable for their exceptional durability and longevity.

Position them based on the sun’s path and your greenhouse’s orientation to ensure adequate shading during peak sunlight hours. Secure the cloths well to withstand wind and adjust their coverage as seasons and weather change, meeting the varying needs of your plants.

Sprinkle Your Greenhouse Roof for Cooling

Roof sprinkling uses water’s evaporative cooling effect to lower temperatures inside. This method directly cools the roof and air while increasing humidity, which suits certain plants better. Its cooling effect is especially noticeable in summer, making the greenhouse more comfortable.

Additionally, sprinkling helps clean the roof, enhancing light penetration. Plan your sprinkling system carefully, considering design, water quality, and how often and much to sprinkle. Even without electricity, you can manually manage this system with solar pumps, offering an eco-friendly cooling solution ideal for resource-limited or sustainability-focused greenhouses.

Paint Your Greenhouse with Shade Paint

Applying white shade paint to your greenhouse is smart for cooling, especially in the hot months. This method works by reflecting sunlight, keeping the interior cool and protecting your plants. White shade paint reflects most of the sun’s rays and even releases some absorbed heat, helping maintain a stable temperature.

This approach is budget-friendly, straightforward, and suitable for all greenhouse sizes. It reduces the need for air conditioning, saving energy and improving plant growth and yield. Regularly check and refresh the shade coating to keep it effective and prevent any long-term effects on light penetration.

Position Your Greenhouse Under Garden Shade

Leveraging garden shade is another smart tip. Many small greenhouses are portable. Moving your greenhouse under a natural tree shade in the summer heat can cool it down and protect your plants from harsh sunlight.

Using natural shade saves money and adds to your garden’s aesthetic. It creates a more natural growth environment, similar to what plants experience in the wild, supporting their health and development.

Place Your Greenhouse Near Water

Placing your greenhouse near a fountain or pond can also help. Like rooftop sprinkling, water bodies absorb heat as they evaporate, cooling the surrounding area. When you place a portable greenhouse near water, this natural cooling effect is a bonus.

Additionally, being close to water provides a moist environment for plants that love humidity. It increases air moisture around the greenhouse, reducing water evaporation inside and cutting back on watering needs, offering plants a more stable environment.


To wrap up, we’ve looked at several ways to cool your garden greenhouse without electricity, from natural ventilation and using shade cloths to white shade paint and positioning near water or under shade plants. These strategies can greatly reduce energy use while protecting crops, offering an eco-friendly and cost-effective solution. Thanks for reading, and if you have more tips on cooling greenhouses, feel free to share them with our readers.