We've had 3 heat waves this summer and the humidity has been unbearable . Our A/C runs from am to pm non stop. We don't open the windows at night because it never cools off enough to make it worthwhile. Anytime after 9:00 the air is so humid that it would just make things horribly damp in here. We get plenty of sun , we keep the blinds closed on the side it happens to be coming through. At suppertime we get the hottest of the sun and it heats up the house as high as 78 if we don't let the air run. We have it set for the daytime and I turn it to 68 for the night . Not worth turning it off and as was mentioned it's cheaper to let it run on the cycle than to shut and start it. Things are supposed to be cooling off a little for the weekend but we still need the air or we would fizzle out pretty fast.