greenhouse heating up

[Brian_Hench]

Originally Posted by cathy

it hit 100 degrees today and this is just the beginning. i have a 12 x 20 greenhouse with a water wall and floor misters since the water wall does not do what i had hoped. anyway 3 exhaust fans are going full blast opposite the water wall, 3 fans inside circulating the air, shade cloth, aluminet and white styrofoam panels here and there. without cutting out much more light what can i do? roof vent? another fan blowing air straight up from the floor? i have to keep my orchids happy.
cathy in s. texas

You didn't say which part of Texas you live in. If it is a dry part, the swamp cooler can be quite effective. But if in a humid part, not so effective as an air conditioner.

If your shade cloth is no suspended above your roof, that can make a huge difference. When the cloth lays on the glass, the heat is transferred to the surface. I have a rack made of 2 x 2 about 12 inches above the roof.