GermGuardian Hi CADR True HEPA Filter Air Purifier Review

GermGuardian is a manufacturer based in the United States and is widely renowned for its disruptive innovations. It has infiltrated the air purifier space, introducing some of the very best air purifiers that come at affordable prices. 

Mostly, their devices happen to be on the big side but now, we have seen the introduction of the GermGuardian AC5900WCA filter. 

So, as part of our GermGuardian AC5900WCA review, we take a look at what this air purifier has to offer. Inside this air purifier buying guide, you’ll find other models worth considering. 

We’ve also put together a brief buyer’s guide to help you decide whether or not you need an air purifier in your home. Keep reading to find out all you need to know about the GermGuardian air purifier.

How To Choose Air Purifier On Amazon 

Why should you consider buying an air purifier?

No matter where you reside, homes are always filled with allergens and bacteria. This is the reason that many people are starting to realize how beneficial getting access to purified air is. 

That is the only way you can breathe with ease no matter the time of the day. With the help of an air purifier, you can get rid of more than 99% of atmospheric pollutants. And for individuals with conditions that require very high quality, getting an air purifier is one of the best decisions you can make.

Understanding The Role of An Ionizer In Air Purifiers

With the help of electricity, ionizers send out negatively charged ions. When these get released into the atmosphere, it causes particles such as dust which are positively charged to cling to the negative ions. 

This makes them drop to the floor so that you can clean them up eventually. 

But you want to be careful when purchasing some air purifiers because ionizers are known to release some ozone amounts.

Who Is An Air Purifier Ideal for?

To be more precise, we recommend that everyone purchase an air-cleaning device for their homes. but some groups of people will benefit more from buying an air purifier. 

Some of these people include individuals with bad sleeping habits, kids, the elderly, people who suffer from hay fever, patients with allergies, and individuals with respiratory conditions. 

Since breathing is a natural activity that is essential to human existence, shouldn’t you take steps to ensure that you supply only high-quality air to your lungs?

With the help of devices like the GermGuardian AC5900WCA, you can get rid of as much as 99.97% of pollutants. 

Think about how refreshing it is to know that virtually all airborne pollutants, particles, and odors will be removed from your home in the presence of an air purifier.

GermGuardian AC5900WCA Review In Detail

Let’s go into a proper review of this GermGuardian air purifier which has been designed by the manufacturer to take over the low range market. 

The AC5900WCA stands out as a statement from Guardian Technologies. 

It is built to be innovative in design and good for business. Garden Technologies has an objective to become a leader in all market segments just like Rabbit Air, as well as Levoit and Blueair.


  • Comes with the True HEPA filter
  • You get a 3-year warranty
  • Much improved CADR rating when compared to similar air purifiers
  • Very powerful with the UV-C light combination


  • Tends to be noisy when set at the highest
  • Replacing the filter can be expensive

To get this air purifier, you will have to spend around $189 putting around the lower range category. But even with that, the GermGuardian AC5900WCA filter is a reflection of precision and direction by the brand. 

You can also take a look at the new AC9400W to see a similar representation of direction.

Design And Size 

This GermGuardian air purifier is evidence that the company has made changes to its original design patterns. Now, what we have is a product with a concept that is more logical and refined. 

You no longer see the design language that was quite confusing and you can say goodbye to the 28-inch tower style. What the GermGuardian AC5900WCA now has is a height of 21 inches and a width of 16 inches. 

This equips the device with a solid-looking profile and helps customers appreciate the power of the fan better.

When you talk about how affordable this GermGuardian air purifier is, the design is structured to save expenditures without sacrificing the performance of the air purifier. Most of its body is plastic and it is devoid of the light that was usually positioned on the front panel. 

This air purifier is the first among the family to come with an airflow system that goes from bottom to top. The manufacturer achieved it by fitting the device with a small air outlet grill placed directly on top of the purifier and a large air intake grill positioned in front. 

This is similar to the design of other top-rated air purifiers like the Levoit LV-PUR131 and Coway AP-1512HH. You’ll also find a control panel that has up to five function buttons.


Another interesting feature of the GermGuardian AC5900WCA filter is the three-in-one filtration system that shows how powerful this product is. It combines three widely renowned filter types so that the air in your house stays clean at all times.

Pre-filter – which comes with an activated carbon filter for the removal of pollutant particles, as well as smells that come from pets and cooking.

True HEPA filter – with the help of the True HEPA filter, this air purifier can trap up to 99.97% of allergens, as well as mold spores and dust, with a size as tiny as 0.3 microns.

UV-C Light – The GermGuardian AC5900WCA can effectively kill mold spores, viruses, and all kinds of bacteria in the air with the help of a UV bulb.

The True HEPA filter helps to boost the air purifier’s performance rating but you will have to make replacements every 6 to 8 months.

Room Coverage

This highly recommended air purifier is what customers have always wanted from the brand. The GermGuardian AC5900WCA has the capacity to cover rooms that are as large as 338 square feet. 

Comparatively, this coverage capacity is similar to other brands such as the Winix WAC9500 and Coway AP-1512HH. 

Rest assured that the air in your home will become clean within a quarter of an hour with an ACH of 4X.

With a 220 Dust/ 218 Smoke/ 215 Pollen (cfm) CADR, this device does its job faster than the Levoit LV-PUR131. However, it doesn’t really measure up to the Honeywell HPA300’s fan power. 


We want to remind you in this GermGuardian AC5900WCA review that this device has only three fan speeds. So, expect the same level of noise that you will get from an average air purifier that has five to six fan speeds. This air purifier makes such noise due to the bigger fan that comes with the device.

Best GermGuardian Purifier Reviews 

GermGuardian AC5250PT

This is up there on the charts as one of the best selling products from Guardian Technologies. Its external design is similar to that of many other models but you will find something different when you look inside. 

The GermGuardian AC5250PT comes with a fantastic air purification system that works in four stages. You get the pre-filter with activated carbon, True HEPA, and UV light. It also has a PetPure Treatment that helps to prevent bacteria from growing and accumulating on the filters. 

The filter also has an Energy Star rating which means you won’t have to spend so much on electricity bills. You also have a programmable timer, five fan speeds, and an indicator for a filter change. 


  • Energy efficiency
  • Great aesthetics
  • True HEPA
  • Affordable (upfront)
  • PetPure treatment


  • Not too ideal for large rooms
  • Filter replacement can be costly

GermGuardian AC5000E

This amazing GermGuardian air purifier features a purification system that comes in three stages. You also get the pre-filter with activated carbon, True HEPA without PetPure Treatment, and UV light. 

But one thing that we notice about the AC5000E is that its CADR rating is better when compared to the AC5250PT. What this implies is that this air purifier can get rid of pollutants very fast. 

Keep in mind that it features only three fan speeds and no programmable timer. 

With its Energy Star rating and filter change indicator, know that you’ll be getting a highly efficient GermGuardian air purifier.


  • Affordable (upfront)
  • Not too bulky
  • Energy efficiency
  • Great aesthetics
  • CADR rating of 125+


  • Not too ideal for large rooms
  • Filter replacement can be costly

GermGuardian AC4100

Next on our list is the GermGuardian AC4100 which is a compact air purifier that does not weigh up to 5 pounds. You can place this device on your desktop, shelf, and bedside table comfortably. 

It also comes with a filtration system that works in three stages and is ideal for getting rid of various pollutants in the home. 

The AC4100 is effective against bacteria and allergies and is Energy Star-rated. Although this model does not come with a True HEPA filter, it is equipped with an optional UV light that helps to get rid of germs. Its HEPA-type filter can take out up to 99% of particles as small as 0.7 microns.


  • High energy efficiency
  • Affordable (upfront)
  • Very quiet purifier
  • Portable, not bulky
  • Great for removing odors and bacteria


  • Does not have a filter change indicator
  • The replacement of filters is quite expensive.
  • Small room coverage

GermGuardian AC9200WCA

This is another highly-rated GermGuardian air purifier and it’s a console-type device that comes in a white design that looks very sleek. 

The filtration system is in five stages that feature a pre-filter, True HEPA filter, as well as an activated carbon filter. 

There’s also an optional UV light, as well as an optional ionizer. The AC9200WCA is highly effective in dealing with various pollutants.

The AC9200WCA is built with an indicator for filter change and also a six-hour programmable timer. You also have the option of turning the ionizer and UV options off if you wish to. You’ll also notice it has 3 fan speeds but you should as well know that the ionizer can emit ozone in trace quantities. 

Quite on the high side, the unit will cost you between $300-400 and it also incurs relatively highly long-term expenses on filter replacement. 

But the AC9200WCA still makes its claim among our GermGuardian air purifier reviews as a highly potent device for getting rid of air pollutants.


  • Great design
  • High CADR ratings
  • Effective against allergens and bacteria
  • Very quiet and high energy efficiency


  • Costly for many customers
  • Quite on the heavy side
  • Ozone-emitting ionizer
  • Doesn’t come with as many features

Best GermGuardian AirPurifier FAQ

What does the GermGuardian do?

The GermGuardian AC5900WCA Is designed to get rid of bad odors and kill mold spores in the air. You can place it virtually anywhere, from your home and office to the school classroom. It comes with UV-C light, the kind you mostly find in hospitals that helps to get rid of viruses and germs.

Can you clean a GermGuardian filter?

Yes, you can. Make sure to carry out routine air purifier cleaning at least once every 30 days.

How do you reset the HEPA filter on the GermGuardian?

Before using this air purifier, make sure to take the filters out of the plastic bag. You will find the reset light on the control panel. Once it gets to a point where the filter needs to be replaced, it illuminates. Once you have completed the replacement, use a thin object like a pen tip to reset the system by inserting it into the reset area. 

How long do GermGuardian filters last?

Depending on how much you use the air purifier, replacements should be done every 6 to 8 months. 

Related: Alen Breathesmart Flex HEPA Air Purifier Review


This is where we call it a wrap on our GermGuardian AC5900WCA reviews. For a GermGuardian purifier that doesn’t cost up to $200, the AC5900WCA is a device that we highly recommend for all households. But should you consider something with more effective performance, you may also consider the Coway AP-1512HH that has a superior fan power.

In case you need to moisturize your home a little bit, check out this Aprilaire whole-house humidifiers comparison.

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