Understanding the Different Types of Furnace Filters

Posted on Nov 30 2017 - 1:00am by Home Gurus

furnace filterFurnace filters are an important part of your heating furnace. Their role is not only to screen out debris and other foreign objects from the heating furnace, but also to enhance the system’s productivity.

It is important to have your furnace filters changed frequently. This will ensure that the indoor air is always healthy and clean, free from bacteria and allergens that may cause respiratory problems. The frequent replacement also ensures the longevity of your furnace.

So what type of furnace filter would you choose for a furnace installation in Utah? Whipple Service Champions outlines the options you may have.


This type of filter is made up of polyester strands. When air flows through these strands, they become electrically charged, attracting pollen and other debris to the filter. Electrostatic filters have a higher MERV (Minimum Efficiency Report Value) rating as compared to most mechanical models. This means they are efficient at trapping dirt. You can use these for three consecutive months without having to clean them.

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An electronic filter follows the same concept as an electrostatic filter in terms of attracting dirt. The only difference is that electronic filters attract debris through electronically charged wires rather than polyester strands. They are so efficient that within a week there is often excess dust build up on the wires. It is best to have them cleaned weekly.

High-Efficiency Particle Absorber (HEPA)

This is perhaps the best type of furnace filter on the market. They are so good that they do not have a MERV rating. Their only downside is that they are quite expensive. They are mainly used in furnaces in highly sanitized areas, such as hospitals, surgical facilities, and laboratories.

Furnace filters should be inspected monthly to ensure that they are in their best condition. This is especially true when it is cold and the heating system runs continuously. Poorly maintained furnace filters will cause the system to work extra hard, resulting in increased energy costs.