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  • Writer's pictureMichael Cox

Neglecting your filters is an expensive but avoidable mistake

Updated: Jul 13, 2022

An AC service technician changing an air conditioning filter.

Severely neglected filters lower your heating and cooling efficiency. They also increase operating costs and leads to premature equipment failure. In this report we’ll discuss:

  • Why filters are so important

  • When to change filters

  • What type of filter is right for you

Why filters are so important?

Air circulation is the key to efficient operation of every forced-air heating and cooling system.

If there is a clog anywhere in the duct work the system's performance suffers and operating cost go up. Dirty filters are the most common cause of the clog.

So why even have filters?

As air moves throughout your home is carries dust, pet dander, dead skin, pollen, lint, dust mites, allergens, smoke, bacteria, virus carriers and more. Yuck. Filters trap this stuff. Some types trap more than other and we’ll explain this in detail later. But for now, just remember filters capture contaminants in the air. At this point you might be thinking, “Okay I get it, but why do we have filters?”

If we didn’t have filters your expensive heating and air equipment would capture this stuff.

Over time, they would become clogged and not work as well and eventually they would stop working altogether. Cleaning clogged evaporator coils and blower assemblies is hard and expensive. Filters are inexpensive and easy to replace.

A side-by-side comparison of a dirty and clean evaporator coil.

Here are some examples of expensive contamination. This is a comparison of a dirty and clean evaporator coil. Air must flow freely through the evaporator coil but when it gets clogged that can’t happen. This air restriction causes the blower fan to work harder and longer than it should. This restriction also causes major problems whether you are trying to heat or cool your home.

  • Heating – When air can’t flow over the heat exchanger as it should the temperature rises in the furnace. When the temperature gets too high a safety switch turns the furnace off. No heat and you’re cold.

  • Cooling -- When the proper amount of air can’t flow over the evaporator coil the coil will freeze and no air can flow. No AC and you’re hot.

an example of a air handler blower motor fan.

Here’s what happens to the blower assembly. When the blower assembly gets like this it can’t more very much air. Low air flow causes all the problems mentioned above.

Summary, always use filters and change them when necessary.

All-Seasons Comfort Heating and Air Conditioning

103 Jordan Creek Dr.

Jamestown, NC 27282


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