I have heavy dark drapes in the three bedrooms on the south and a pull down shade on the one on the north side. I keep my kitchen at half the window. I try to keep as much of the sun light out as I can. I think you would be surprised at how the new energy efficient air conditioners are. Once the house is cooled down they don't take much. I live in 2,250 sq ft and total electric and my bill runs me on the average of $175.00.