install a high-performance showerhead. This uses 1½ gallons of water per minute (gpm) rather than 2½ gallons, the federal upper limit for new showerheads. A good place to buy a energy efficient shower head is at your local home depot.
Replace incandescent bulbs with CFLs (compact fluorescent lightbulbs). I have one in my old bedroom of my parents house that has lasted 10+ years, Its one of the first generation light bulbs that uses mercury. The old cheap bulbs sometimes will just pop with a simple flip of the switch.
Wash clothes in cold water. Using hot water cost much more money each month. Also do as big of a load as possible. The more loads you run the more you pay each month.
Install (and properly program) a programmable thermostat. When you install a thermostat you save money by only using the heat and air conditioner when you are home. So when you are at work you can have the heat low or off and set to when you get home its running.
• Turn your refrigerator down. Refrigerators account for about 20% of Household electricity use. Use a thermometer to set your refrigerator temperature as close to 37 degrees and your freezer as close to 3 degrees as possible. Make sure that its energy saver switch is turned on. Also, check the gaskets around your refrigerator/freezer doors to make sure they are clean and sealed tightly.
• Make sure your dishwasher is full when you run it and use the energy saving setting, if available, to allow the dishes to air dry. You can also turn off the drying cycle manually. Not using heat in the drying cycle can save 20 percent of your dishwasher’s total electricity use.
Select the most energy-efficient models when you replace your old appliances. Now days energy star appliances will save you a ton of money compared to older appliances.
Modernize your windows. Replacing all your ordinary windows with argon filled, double-glazed windows saves 2.4 tons of CO2 per year for homes with gas heat, 3.9 tons of oil heat, and 9.8 tons for electric heat. Older windows in homes just do not hold in heat and tend to let air leak in. Do some research because even some newer windows will generate mold. I have had that problem in some luxury apartments that I rent. I think they went cheap on the windows like most large corporations do. In the long run they spend more money.