Regularly changing the air filter in your furnace can improve the air quality in your home and improve your HVAC system efficiency. It is recommended that you change your air filter every three month. However, if you have pets, smoke or have allergies you should change your filter more frequently.
Before you purchase your replacement filter you need to determine the location of your filter. You then need to determine what type of filter and the size of the filter you need. The most common location of the filter is between the furnace air handler and the return air vent. Some furnaces have filters inside the air handler and the least common location is in the return air vents. The size measurements of the filter should be on the side of the existing filter. If they are not then you will have to use a tape measure and measure it. You will need to measure the length, width and depth of the existing filter. Be sure to write the measurements down.
There are several different types of filter available. Either the light weight or the high efficiency filters. For even better quality there are filters with the HEPA filtration and allergy reduction technology. These filters come in one inch as well as thicker two to four inch versions. Less common types are electrostatic and re-useable washable filters.
When you are ready to change your furnace filter turn your furnace thermostat to the off setting. Remove the old filter being careful to not knock the old dust off of the filter. Before you install the new filter write the date on it for a quick reference in the future. Insert the new filter and make sure the arrows are pointing in the direction the airflow flows through the system. Make sure your filter is secure and then turn your furnace thermostat back on.