reliable hvac technician working ac air handler filterThe purchase of an air handler can be a large decision for any home or office.

Commonly referred to as an AHU or an air handling unit, these systems keep your indoor spaces clean and contaminant-free by circulating fresh, temperature-controlled air throughout your indoor environment.

While the purchase and installation of such a unit can provide many benefits, it can also be a large and costly project, meaning you will want to know how to properly care for your system over the years to make it last.

Consistent and accurate maintenance can dramatically increase your unit’s lifespan and give you more bang for your buck. Here, we take a closer look at AHUs so that you can be equipped to properly care for your new air handler.

What Is a Filter Drier?

A simple way to make sure your unit is operating at top efficiency is to regularly replace your filter driers. Filter driers act as strainers, removing moisture, acid, and grit from your system which allows it to operate smoothly.

There are two prominent types of filters used today, each with their own purpose and benefits. Distinguishing the difference between the two will help you better understand your system and what it needs.

Among others, the two main types used today are liquid line and suction line filter driers, which often are used in conjunction with one another:

  • Liquid line driers clean up liquid refrigerant as it flows through them, filtering out particles and damaging moisture.This type is filter is necessary for the proper day-to-day operation of your AHU.
  • Suction line driers are used to protect your system’s compressor after any sort of system failure which may have allowed contaminates into the heart of your air handler. This type of filter acts as a backup in case of a power outage, and protects your entire system from damage.

Without a filter drier, moisture and debris will make their way into your system, mix with the refrigerant to cause sludge and buildup, and greatly decrease the efficiency of your HVAC system.

How Often Do I Need to Replace My Filter Driers?

Filter DrierTo make a noticeable impact on your system’s performance, filter driers should be replaced regularly, depending upon a variety of factors.

Two main things to consider are how often you use your system, as well as how many contaminants are in your air.

Checking your filters every month or so is a good habit to get into for the sake of optimizing your system’s performance and longevity.

In order to get the most out of your HVAC system, it is important to provide regular preventative maintenance. Proper operation will reduce energy bills and save you money in the long run.

While replacing your filter driers is a good start, there is much more technical work that can be done to keep your HVAC system running smoothly. If you are looking to set up a regular maintenance schedule for your air handler, Pro HVAC Service is here for you.


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Pro HVAC Service offers professional residential HVAC repair, maintenance, and installation. To get a free estimate on your residential HVAC project, simply fill out the form to the right of your screen, or just give us a call at (844) 769-5995 today!

Within minutes, we’ll contact you with a list of local HVAC technicians that can help you. If you’re looking for more information, feel free to also visit our FAQ section or check out our blog for up-to-date information, tips, advice, and more!