An air purifier is another seemingly harmless appliance that can draw more power than an energy-efficient refrigerator. A standard air purifier uses about 550 kilowatt-hours per year in electricity, according to the DOE. Energy Star-qualified purifiers are 40 percent more efficient than standard models, and should be sized appropriately for the space.
Dehumidifiers are another big electricity hog. If you need a dehumidifier, look for an Energy Star model.
These may or may not be the biggest energy hogs in your home. To find out, I recommend borrowing a power meter from your library or utility company. If that’s not an option, buy one. You should be able to make up the cost through electric bill savings. Pay particularly attention to everything in your home that is powered up 24-7.