Greenhouse: Keeping the cold air out, 1 by MaryE

MaryE wrote:
Since our weather is feeling wintery now we put blue foam board over the intake and outlet vents for the automatic ventalation system and turned it off. Two straw bales in front of each intake vent hold the foam in place, the outlet vent has foam board wired on to the vent frame. For the winter months I'll have to manually control the door and roof vents on sunny days. Last night we had 18 degrees, tonight 6 is forecast. Add wind and there was a lot of infiltration. Also the outlet vent has louvers that are not connected to the vent motor, they just open by air pressure, so they were flapping in the breeze letting the heated air out.