Replacing a standard air conditioner set at 22 degrees with an energy-efficient model set at 25.5 can cut your cooling costs in half, though savings vary by climate, according to Xcel Energy Inc., a regional utility based in Minneapolis. A programmable thermostat can save as much as 12%. A ceiling fan can lower a room's temperature by several degrees. Even something as simple as switching to compact fluorescent light bulbs can make a big difference in electricity bills.
Micki Wehmeier offers another tip: Marry a man who likes it hot.
Ms. Wehmeier and her husband, Gary, are renting a modest apartment this summer while they fix up a house they just bought in Des Peres, Mo. To save money, they resolved to keep the thermostat at 24.
'He's got more willpower,' his wife says.
And Reba Kennedy, who turned off her central air altogether?
Ms. Kennedy now cools just the three rooms she uses most in her San Antonio home, with window units set at 25.5 degrees. To her surprise, she has found it pleasurable. With her downstairs windows open, she can smell the honeysuckle in her yard. She loves the look of her sheer curtains blowing in the breeze.
Last week, though, when she reviewed her electric bills, Ms. Kennedy found that her sacrifices haven't translated into savings. In June of 2006 -- with the central air on full blast -- she used an average of 26 kilowatt hours a day. Last month? An average of 44.
Harvey Sachs, a senior fellow at the American Council for an Energy-Efficient Economy, says that isn't surprising, because window units are notoriously inefficient.
Her advice to middle-class families: Pull the plug.
'You'll be hot,' Ms. Boylan said. 'Put a little cold water on your face and get on with your life.'