When I discovered that the previous owner painted over the meager
number of soffit vents on my South Florida home, I knew that my attic
really needed ventillation.
This was my solution:
I took advantage of the overhanging soffits. I cut a 22-1/2 x 24 hole
in the front and rear of the house. I framed the holes with moulding
as if it was a picture frame. I cut a piece of plywood to fit and not
fall through. A hole 18" in dia was then cut into the 2 plywood
pieces. A cheap pair of 20 box fans were mounted onto the plywood
sheets. One fan blowing up into the attic and the other exhausting
the attic. Incidentally the 3 speed Lasko fans blow at 1,2 and 3000
The fan blowing up is at the fron of the house and is running at low
speed. The exhaust at high speed. A timer turns them on at 10am and
off at 8pm.
Wow! What heat is blown out. My attic now stays below 110 weras
before it approached 130. The house feels cooler and thereis now hot
attic smell that I used to enjoy.