How to Change your Air Filter

Changing your filter is an ideal way of maintaining your home heating and cooling system

in good condition. While some home conditioning system comes with air filters that can be rinsed in a bathtub or simply hosed off, other use fiberglass filter that cannot be reused. Replacing your air filter is perhaps the easiest and quickest process. Basically, you’re simply swapping an old filter with a new one. The entire procedure should take you less than ten minutes. The simple six steps to follow when changing an air filter includes;

  • Turn “off” the air conditioning system
  • Find and locate your air filter
  • Determine the size of your air filter
  • Remove the old filter
  • Turn “on” the furnace

Step 1: Turn “off” your home cooling and heating system

You don’t want your HVAC unit to turn on while you’re changing the air filter. Therefore, you need to make sure that the thermostat is in “off” position. This helps in protecting the HVAC system from loose filter fitting or loose debris getting into the duct system. For maximum safety, you should disconnect power from your home furnace system while you’re doing the replacement.

Step 2: Find and locate your air filter

To locate your air filter, you may refer to the user operation manual that came with your home conditioning system. If you don’t have the manual, then you can check below your furnace’s blower compartment or the metal ductwork below the blower fan. To do this, you need to remove your furnace cover by simply lifting it up.

Step 3: Determine the size of your air filter

Once you’ve located your air filter, you need to determine its exact size as this will help you to find the perfect replacement. Air filters usually come in Every size you can imagine. Your operation manual should tell you the kind and size of a filter that recommended for your home heating and cooling system. If it doesn’t, then you have to check for the dimensions by removing the old filter and checking on the cardboard filter frame for the printings. If you cannot still locate the information, then you may use a ruler or a measuring tape to get the dimensions.

Step 4: Remove the existing filter

Before removing the old filter, you should note the arrow printed on the filter frame that indicates the air flow direction (usually printed pointing towards the system’s fan unit). You need to install your new air filter in the same direction as the current one. After you’ve noted the airflow direction, you can now pull out the old filter from the furnace and dump it.

Step 5: Insert the new furnace

Again, you should note the printed arrow on the old filter frame showing the correct airflow direction. Insert the new air filter with the air flow direction remaining the same as the old one. Basically, home air filters are designed to filter air for one particular direction. This protects them from collapsing or falling apart when they are loaded up with dirt.

Step 6: Return the system to “on” position

Once you’re done with replacing the filter, make sure you turn the system to “on” position. You can now use your home conditioning again.


Air filters are the perfect way of maximizing the efficiency of your home’s conditioning system. You should avoid running your central air system without a filter as this will lead to the system drawing an incorrect amount of air flow hence leading to damage.

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