Quick Answer

Proper greenhouse ventilation keeps your plants healthy by regulating temperature, reducing humidity, and ensuring fresh air exchange. Whether you're using roof vents, louvres, or fans, airflow is essential to prevent plant stress, disease, and heat buildup—especially during peak growing season. A well-ventilated greenhouse supports stronger, more productive crops year-round.

Do you have a greenhouse roof vent that is no longer opening or not opening enough?

Over the years, the piston moving through the seals gradually wears the seal material away, allowing a gradual seepage of wax out of the cylinder. This reduces the pressure within the cylinder and needs to be replaced. But it could also be that the wax in the cylinder just needs a simple kickstart and a warm bath. Here is a tip to see if you can get them working again: