If you're in the market for a new television, check energy efficiency ratings. The Energy Department bestows its Energy Star rating to sets that use about one-third less energy than regular televisions. In general, LCD televisions use less energy than plasma screens, but both use more than older sets.
Remember to turn the power off or unplug your digital photo frames when you're not gazing at those illuminated photos. Over the course of the year, leaving one on costs about $9—not a lot, but when thousands of people are doing the same thing, it adds up.
In the kitchen: Baking a cake or casserole in the summer will force your air conditioner to go into overdrive. Plus, eating hot food will only make you want to turn the thermostat down. But you don't have to survive on cold pasta salads and gazpacho this summer. Instead of using your oven, consider an outdoor grill or toaster oven for small amounts of food.
If you're up for a challenge, try baking cookies on your car—yes, your car. Nicole Weston of Baking Bites developed a method of baking chocolate cookies with the heat that collects inside cars on steamy days. She suggests parking in the sun, using a thermometer to help monitor the temperature, and protecting your dashboard by putting a barrier between it and the baking sheet. (It should be at least 95 degrees outside and the baking process takes around two and a half hours.)
In the bathroom: If you don't want to spend money on a low-flow toilet, you can still make yours more efficient by dropping a soda bottle filled with sand or water into the back. It will use less water each time it flushes. Ivan Chan of carbonfund.org adds that small steps such as turning the water off while brushing your teeth or shaving can save a substantial amount of water (and money on your water bill) each year. He also recommends installing a water conserving showerhead.
In the bedroom: Stay cool while you sleep with an overhead fan instead of pumping air conditioning throughout the entire house. Shutting the doors and vents of unused rooms can also lighten the load of your air conditioning unit.
Outside: A way to reduce cooling costs in the longer run is to plant trees or shrubs so that your house is more shaded, especially on the sunnier side, says Kweller. (For a quicker fix, draw the blinds or shades when you're not home.)