Years ago I was renovating a house (without AC) located on a hill. I used corrugated metal pipe - two runs of 8" I think it was. The pipe went out the basement wall, across the back yard, and exited on a hillside. A metal frame was welded up with burglar bars and mesh to keep critters out. That frame went on the inside of the poured concrete foundation wall. In front of that was a second frame, hinged to the first, made to hold two thicknesses of furnace filter. An operable skylight controlled by temperature and humidity on the second floor was the other part of the equation. When the skylight opened a noticeable amount of cool air could be felt coming through the furnace filters. The owners were very happy for years to come.
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