The Importance of Changing Air Filters in HVAC Systems

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The Importance of Changing Air Filters in HVAC Systems


Air filters are our best defense against pollen, dust, pet dander, etc. circulating in our indoor areas. But air filters also provide a defense against any larger objects that could be pulled into the system, such as loose insulation, which could create a fire risk. Not changing the air filter regularly will not only create more nastiness in the air, but it leads to conditions that foster mold or bacteria growth, and can cause unnecessary strain on the HVAC system. This can lead to future ac repair costs.

air filter

Clogged air filters are the number one cause of HVAC system failures. The job of the air filter is to collect all dirt, hair, dust, mold, etc. When the filter is not changed, the air cannot pass through it readily, as it is designed to do.

Effects of Dirty Filters
* The blower fan in the HVAC system has to work harder to push air. This will increase your energy bill plus put extra strain on the system, making the system wear out faster.
*The difficulty in the air moving means rooms are not getting the air they need. This means the temperature sensors which regulate when the HVAC system turns on and off, may not register the temperature needed to signal the system to power down. That will eventually wear down your fan motor.
*When the air can’t travel out of the furnace, heat pump, or air conditioner the system could possibly over heat or freeze up. Basically, the unit will run, costing you the same amount of gas/oil, but no change in the indoor temperature.
air filter
*The build up of debris on the air filter itself can provide a space for moisture build up, which provides the perfect environment for mold and bacteria to grow. Not only do these make an even harder barrier for air to flow through, but if the growth is on the wrong side of the filter, it will introduce all that growth into the indoor air, possibly making you sick.

Most HVAC systems will ask the filter be changed every two to three months. It is best to change them once a month if you live in a high pollen area or if there are pets in the home. Changing the filters are fairly easy. The HVAC unit’s documentation should have the size filter you need and the MERV (minimum efficiency reporting valve) range the furnace falls in to. A high MERV filter has a very tight mesh that could be too much for some units resulting in a situation a lot like a clogged filter. Filters are relatively inexpensive and are easy to slide the old one out and pop a new one in.

Cagle Service strives to make sure every customer is meeting their home or office comfort goals. We have ac maintenance plans that include the changing of your air filter, among other things. If you need any further assistance or questions, please give us a call at 731-300-1030 and we will help however possible.


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