Ancient Romans had air conditioning. In the summer, they would seal all their windows and doors, but open a hole in the center of their house down into a tunnel that travelled under their house for 20 feet or so, to the outside
Ancient Romans had air conditioning. In the summer, they would seal all their windows and doors, but open a hole in the center of their house down into a tunnel that travelled under their house for 20 feet or so, to the outside, and opened in a shady spot. This underground tunnel contained air cooled by the earth.To draw cold air into the house, the Romans had a black-painted, 3 foot chimney on their roof. When the sun heated the chimney, the hot air inside the chimney (and house) would rise, and pull the earth-cooled air into their home. Since air in underground caves is 65 F year-round, this process cooled their homes considerably.
You may be able to cool your home by blowing the cool air from your basement through your duct work, or by aiming a fan up you basement steps. Alternatively you can freeze water in water bottles, place them in a dish drainer (set atop a towel to absorb condensation), and direct a fan across the ice filled bottles.
If you're feeling a bit more adventurous, check out this air conditioner constructed by a student. This homemade air conditioner uses a fan, an ice water filled cooler and copper tubing. Note: you can pick up the zip ties used in this project at the dollar store to further reduce the cost of this project.