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How Do I Measure My Air Filter?

When you need to replace your air filter, these  steps will help you measure the right dimension for your purchase. Your system is expensive!   Maintaining it will insure it is operating efficiently and maybe you will see less trips by a repairperson.   An affordable air filter purchase is cheaper than a service call.  A new air filter will keep good air quality in your home, increase the life span of your system, and consume less energy – lowering your bills.

We hope that your on-line purchase also is more convenient that you running down to a store.  If you buy a case you will always have a new air filter right by your side.

Your air filters should be changed every 30 to 90 days depending on the type and efficiency of your air filter. However, according to Energy Star (,air filters should be changed every month during peak summer and winter months when your HVAC system is operating at highest capacity.

Remember to turn off your HVAC unit before attempting to change the air filter. If you can’t see the shut off switch just turn off the circut breaker.  Be safe!   Can you locate your air filter ???   Most air filters are located to the right or bottom of the unit and should easily pull out of the slot. Some air filters are found in air vents instead. If that is the case, you might need to contact a professional for assistance.   You might want to draw attention to where the filter is with a pice of duct tape and you can mark with a pen what size your unit takes and in which direction the airflow of your unit goes.  Make it easy for everyone in the household to know how to replace them and what the filter numbers are.

To measure your air filter, follow these easy steps:

• Step 1: Measuring Length and Width (L x W). (If your air filter is not a square, the smallest measurement goes first).

• Step 2: Measure Depth (D) – Measure the thickness of your air filter.

• Step 3: Put Your Measurements Together (L x W x D).

• It’s as simple as that! You are now ready to buy the right filter for your AC or Furnace