Yvonne's Greenhouse

Ventilation

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Beginning with the entry door, we used a storm door that had a screen from top to bottom. During the winter the screen is replaced with a glass storm-window. Not visible in the picture is a second storm door on the other side of the jamb. We also keep this second door closed during the winter, which forms an air barrier.

This temperature controlled vent needs no electricity. It fully closes when the temperature drops to 40 degrees F and fully opens at 60 degrees F. This vent is most effective in the winter when the doors are closed and the indoor temperature rises due to the large surface area of the greenhouse glazing combined with a sunny day.

A small dual window fan is installed in the floor over a screen. It draws cool moist air from underneath the foundation. A thermostat turns it on when the indoor temperature reaches 70 degrees F.

This 16" attic fan blows open a louvered vent panel. This moves the majority of the heat out of the greenhouse and is located at the top of the wall. A thermostat turns this on when the inside temperature reaches 75 to 80 degrees F.

We purchased bulk shade cloth and sewed a casing in the top and bottom. We threaded ropes through the casings and anchored the ropes to the edges of the roof. The shade cloth is installed from late June through mid September. We found that temperatures soared above 100 degrees F without the cloth.

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