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Serving Austin, TX and surrounding areas since 1979


What Happens When You Don’t Clean Your Furnace Air Filter

You may not know it, but your furnace relies heavily on the air filter that sits in the air return duct. It is this filter that protects the system from dust and other debris that could otherwise infiltrate and damage the system. The problem is that, since most homeowners don’t even know that these filters exist, many of them don’t get them changed or cleaned as often as they should. That leads to some serious issues for the furnace, which could result in the death of the whole system. Read on to find out what happens when your furnace air filter doesn’t receive the service it needs.

Why Air Filters Need Cleaning

The air filter in your furnace is little more than a fiber mesh, closely woven enough to capture debris but loose enough to allow air to flow through it. The filter doesn’t have any way to get rid of the debris that it collects, which means that if it isn’t cleaned or replaced every few months it will become too clogged for air to flow through it. That’s when problems start to occur for the furnace.


A clogged air filter causes heat to become trapped in the furnace while it is running. As the furnace temperature rises to dangerous levels, a part called the “limit switch” activates and shuts down the system to protect it. This doesn’t solve the root cause of the overheating, though. As the furnace keeps turning on, overheating, shutting off, and turning on again, the stress will eventually cause the entire system to break down. This is why keeping the air filter clean is so important.

If your furnace is short-cycling, or you need your air filter cleaned, call Roznovak’s Services. We offer a full range of furnace repair and maintenance services throughout Round Rock, TX. 

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