Crawl Space Ventilation
I have an addition on my house, heated space that has a crawl space under it, 8'x24' poured foundation on four sides. The only opening is about 2.5'x2.5' and I was told by home energy tech that it ok to close the opening with a sheet of plywood and NO vent opening as long as the dirt floor was all covered with sheet plastic.
The tech said that it will save energy in the house with the crawl space closed up, keeping the crawl space cooler in the summer and warmer in the winter. Also he said cement walls would disperse any small amount of moisture down there. I'm old school and thought there always needs to be some venting. I did cover the dirt floor, close up the opening with no vent grate, any thoughts?