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1. Alternate the use of air-conditioning and fans. When you’re comfortable, shut down your air conditioner and turn on the fan. This approach can cut air conditioner use by up to 40 percent according to Con Edison.2. Close the Curtains. Shade windows that face south, east, and west by keeping windows, drapes, and shades closed during the day to keep unwanted heat out of your home. About 40 percent of unwanted heat comes in through windows.3. Open the Windows. Don’t run your air conditioner when the outdoor temperature is below 70 degrees. Open the windows instead.