Keeping your greenhouse cool is paramount for your plant’s health and growing success in the warmer or downright hot days of summer. Plants in an overheated greenhouse will experience a loss of stem strength, a delay in flowering, and a reduction of flower size. Cooling challenges may vary depending on your local climate. Regardless, cooling a greenhouse requires a combination of ventilation, shade, and humidity levels that work in your particular greenhouse region. When choosing a cooling system for your greenhouse, you will have to consider different cooling systems and the benefits that come with each one of them. First of all, consider vents. Traditionally, vents positioned on rooftops allowed warmer air that rises to escape while pulling in cooler air from side vents. The vent’s position may be changed mechanically or manually to maximize benefits from the wind direction naturally. Vents provide lower operational costs, but construction costs may be higher. Using vents alone may also not be effective in bringing the indoor temperature lower than the outdoor temperature. As such, you may need to combine exhaust fans with vents to increase the effectiveness of excess indoor heat removal. The second cooling system type is shading. Paints, clothes, or blinds are other cooling alternatives for your greenhouse. External blinds are most effective, but they can obstruct efficient vent operation. Shading can help make other greenhouse cooling options more efficient by lowering the sun’s intensity on your greenhouse and retaining heat overnight. Then there are evaporative coolers which are typically ideal for drier climates but can also provide cooling in any other region. Misting or fogging are other cooling options that use high-pressure water delivery to release very fine water particles, and the drops evaporate in the indoor environment, lowering the temperature.