I got my electric bill after running our swamp cooler 24 hours a day. I just shut the sorry bugger off. The bill states quite clearly: $331. Maybe I should sell a kidney, become a heroin dealer, and sell my soul to the devil to pay for cool air. Or just deal with having my house be 90 degrees when it's 110 outside. Geez. $331!
The reason I had been running the cooler 24/7 is so that I could sleep at night, and also because when it's really hot out, your walls and furniture take on heat, and it takes more energy to get rid of that wall-heat than it takes to just prevent the heat from establishing itself. Well, perhaps that theory is just wrong. I've shut off the cooler.