The automatic greenhouse window opener is specially designed to prevent overheating in the greenhouse and maintain an ideal growing environment. This opener opens and closes automatically, requiring no electricity or batteries and is completely driven by temperature changes, making it energy-efficient and environmentally friendly. It is suitable for various greenhouse windows, walls and vents, especially in windy environments. When the temperature is between 59°F and 77°F, it automatically triggers the opening function, replacing the traditional manual vent arm. Installation is simple and it can be screwed directly into polycarbonate panels, wood or metal frames. It brings intelligent ventilation solutions to your greenhouse, making plant growth healthier and more lush. Color: Black.