We replaced our furnace last year, and the new one has a fan which can be run independently of the heating function. The fan recirculates air throughout the house. Is there a way to use this to keep the house cool?
It's a two story house with a basement. The basement stays cool year round, and the upstairs gets very warm in the afternoon (no shade trees close enough to shield the upstairs rooms from the sun, unfortunately). We spend the day on the main floor, which is the floor we'd like to cool. All levels have roughly the same volume of space. It seems that if I run the fan, I'll just blend the cool basement air with the hot upstairs air and end with the main living space at the same temperature it was before. But perhaps there's some strategy based on the time of day that I run the fan?
At night we open all the windows and use an exhaust fan to blow warm air out the second storey window, drawing cool air in through the ground floor. As soon as the sun comes up, we close the windows and blinds to keep the cooler air in, and block the sun.