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Ignoring Your Air Filter
Your home's air filter helps to remove dust, allergens and more from all the air that passes through the system. These filters are typically light cardboard-and-wire constructs that are designed to be regularly replaced. After around six months or so, that filter is so filled with dirt, air has a tough time getting through and the unit can't really do its job anymore. That not only raises the volume of dust in your home, it also greatly decreases airflow and efficiency for your AC unit. You can improve energy use for your AC by 5 to 15 percent just by replacing a dirty filter, so make sure that you get a new filter a couple times a year and remember to check and change it after particularly dusty activities, like a big demolition and remodel.
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Never Cleaning Fins and Coils
Air conditioning evaporator coils and fins allow heat to pass from the refrigerant in the system out into the air, just as condenser coils absorb heat from inside the house. This process of moving heat is very important, but it can become impeded by layers of dust and grime. If you never check on your coils, that grime is costing you money and decreasing efficiency. Clean your air conditioner at the beginning of the warm season and check it from time to time, especially after storms or high winds to make sure your coils and fins stay clear.