Before you head home for the weekend, add one more thing to your "to-do" list: Change air-conditioning filter. Dust build up not only restricts the flow of cool air into your house, it also adds stress to your system, which ultimately causes it to work harder and use more energy. (More energy used = higher utility bills)
Not sure how to get started? Here are some detailed instructions, courtesy of eHow.com.
Step 1
Locate your furnace and the filter compartment. This compartment is normally covered by a strip of metal that slides in and out of place.
Step 2
Determine the size of the air filter that needs to be replaced. The sizes are noted on the side and usually appear as 16x24 inches and other similar sizes.
Step 3
Purchase a replacement filter in the size required for your system. There are a variety of filters to choose from, ranging from the inexpensive standard spun glass filters to pricier synthetic polyester fibers.
Step 4
Consider high efficiency filters if you live in warmer, dustier climates as they do more than just capture dust particles. The high efficiency filters can trap tiny particles of dust, pollen, mold and other irritants.
Step 5
Look at hepa filters and filters coated with chemicals to kill bacteria if allergies and other irritants are a concern for your family.
Step 6
Use a black permanent marker when you change the filter. When you slide up the metal guard, note the direction of the air flow marked on the side of the old filter and draw arrows in the same direction on the metal guard. This way you will have no question which direction to insert the new filter.
Step 7
Replace high efficiency filters at least 4 times per year. Read the manufacturer's label as most recommend changing your air filter on a monthly basis. (High efficiency filters do have a longer life expectancy than the less expensive spun-fiber filters.)
Step 8
Discard the old filter.
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