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GermGuardian AC4825 Air Purifier Review

If you suffer from allergies, then you must be aware of how inconvenient it can be living with them. You have stingy red eyes, constantly running nose and itchy hives present all over your skin along with plenty of other symptoms as well. All of this can take the fun out of your entire day.

GermGuardian AC4825 Air Purifier
Our rating:4.4 out of 5 stars (4.4 / 5)

There are many things that can lead to these allergies. You can suffer from hay fever and dread the warm sunny days when the pollen count in the air is incredibly high. Or maybe, your favorite furry friend can lead to coughs and sniffles.

Either way, you may want to find a solution to this problem because nobody wants to struggle with allergies. One way to do that is to use an air purifier.

One best air purifier that can help eliminate this problem is the GermGuardian AC4825. Read on below to find out more about them and why GermGuardian air purifier is the best one in the market.

Who Is GermGuardian?

If you search about air purifiers online, the chances are that the name GermGuardian will definitely pop up. GermGuardian is a company that has created plenty of small appliances that are all designed to help improve your living environment and, in turn, your health.

These products include dehumidifiers, UV air sanitizers, and ultrasonic humidifiers. GermGuardian has plenty of air purifiers that we can discuss, but the AC4825 model is the one we will be talking in-depth about, so keep on reading.

How Does The Germ Guardian AC4825 Air Purifier Actually Clean Air Out?

The full name of the model we need to review is the Germ Guardian AC4825 3-in-1 Air Purifier that comes with a True HEPA filter. What True HEPA Filter means is that this particular filter has a genuine HEPA Filter.

GermGuardian AC4825 Air Purifier Review

Also, these HEPA filters are incredibly good and stand out when it comes down to air purification. Non-HEPA filters mostly do a good job of trapping in large contaminated particles such as dust. But in order to get rid of the small particles that can lead to an allergic reaction, a HEPA filter will small holes is needed.

Furthermore, these HEPA filters are also used in hospitals and even in the military, which shows how strong the cleaning power of HEPA is. However, in order to meet the HEPA standards, an air purifier must capture up to 99.97% of air pollutants that are as small as 0.3 microns in size.

Also, to provide you with a clear idea of how small that is, a human hair has a diameter of 70 microns. So this clearly concludes that a HEPA filter can deal with even the tiniest and microscopic polluted air particles present around.

Furthermore, despite the wallet-friendly price tag these filters have, GermGuardian has not compromised on its quality.

What Does 3-in-1 Air Purification System Mean?

As the name clearly suggests, 3-in-1 air purification by GermGuardian is made of three different parts. These different parts include the carbon filter, HEPA filter, and UV-C light. As mentioned above, the HEPA filter works perfectly well in removing any allergy-causing particles from the air inside.

The carbon filter works in two different ways. Firstly, it acts as a pre-filter and focuses on weeding out the large particles. This helps in extending the life of the HEPA filter. Furthermore, this carbon filter soaks the unpleasant odor such as pet smells, cooking, and cigarette smoke.

GermGuardian AC4825 Air Purifier

Also, it helps in removing harmful gas from the air. This includes volatile organic compounds that are given off by plenty of household items. Furthermore, the 3rd line of defense that GermGuardian provides is UV-C Light.

This defense line depends entirely on you and whether you want to use this feature. It can easily be switched off if you want.

Without making it technical for you, the purpose of this light is to further clean the air. This UV light is effective in dealing with viruses and germs; this includes the staph, rhinovirus, and influenza.

The GermGuardian does not have an ionizer. For this reason, this doesn’t damage the ozone. So if you are looking for an environmentally friendly air cleaning power unit, then this is the one for you. Read on below to find out about its key features and pros and cons.

GermGuardian AC48255 3-in-1 Air Purifier- Key Features

This GermGuardian purifier has plenty of great features that make it stand out. Some of the top features include the following:

Room Coverage

It’s essential that when you’re choosing an air purifier, you must pay attention to the capacity of the room it fits for. Also, keep in mind that if you buy a purifier fit for small rooms but have a large space where you want to use it in, then it will be a waste of your money.

This GermGuardian unit can be used in a room of 161 square feet easily. This means that it will be good for medium and small-sized rooms perfectly.


This product has a height of 22 inches tall, and it weighs only seven pounds. This shows that it has a compact footprint and is great when the space is too tight. Also, since it is incredibly lightweight, you can move it easily from one room to another.

This allows you to start this purifier in one room and then switch it around in different rooms. All of this depends on where you are spending your time the most. However, you must note that this purifier does not come with castors and will need to be lifted instead of being wheeled around.


When talking about its look, this unit has a pretty elegant design. It is simplistic and uses minimalistic attributes. Also, the entire look of this purifier looks more functional than the other models present that have different colors and even artist design panels.

GermGuardian AC4825 Air Purifier Features

This purifier is in black color and has control buttons present of the top. The location of this button makes it very user-friendly. Moreover, the models with various different colors have a hefty price tag as well. So it all comes down to how it works or how it looks.

 Squirrel Cage Design

The important feature of this model is that it blows clean air back out using only one side of the front gate. Many online customers have queries about this but were reassured that the squirrel cage design keeps the air circulation better.

Energy Credentials

In terms of energy efficiency, the GermGuardian is certified by Energy Star. This energy star is backed up by the US government for energy efficiency. Furthermore, it even provides reassurance to consumers who want to keep the environment clean and save money.

Moreover, when it comes down to wattage, this purifier uses 56 watts when on high setting and 41 on low.

How Quiet Is The Germ Guardian AC4825?

This GermGuardian model contains three different fan speeds: high, medium, and low. If your allergies are very strong, then it can be that your air quality is affected negatively. So, it is advised that you make use of a high setting. You can easily switch back to medium or low once the air quality has improved.

However, AC4825 lags behind the other models because of the lack of automatic operation. The control of this unit is done manually. On the other hand, other models have air quality sensors that adjust the fan setting automatically.

However, when it comes to the noise, this unit performs very well. It has 40 dB on low mode, 55 dB on high, and 50 dB on medium. This unit is exceptionally quiet and performs well overall.

How To Maintain Germ Guardian AC4825?

Air purifiers are incredibly simple to use, but they require regular maintenance to work effectively and efficiently. Also, it is a good idea for you to vacuum the pre-filter every other week in order to increase its life. This also helps in enhancing the longevity of the HEPA filter.

However, we advise you not to vacuum the HEPA filter. Instead, we recommend that you change it every six to eight months, depending on your usage. Also, keep in mind that if you only run the unit for a few hours a day, then the filter will last longer.

Moreover, this unit has a built-in filter change light that indicates when it needs to be changed. The UV bulb also needs to be replaced once a year, and since there is an indicator light for this too, you can easily do it when it needs one.

What Warranty Does Germ Guardian AC4825 provide you?

GermGuardian AC4825 also comes with a three-year warranty that covers any defect present in the purifier. It is no surprise that some purifiers come with lifetime warranties, but this is for more expensive models.

However, before buying any purifier, make sure you know about the exclusions and the conditions that you must fulfill. For example, some purifiers void their warranty if you do not use the right kind of filter.

Pros And Cons

Just like every other product present in the market, the air purifier has pros and cons as well. GermGuardian AC4825 has advantages and disadvantages that include:


  • UV-C Light

This UV light on this GermGuardian model helps in killing mold spores, viruses, and even airborne bacteria. This can be turned on and off if the light bothers at night. Also, the UV light activates the titanium dioxide that further helps in dissolving food, smoke, and even pet odors.

  • True HEPA Filter

The GermGuardian model is one of the few models because of its price range and its true HEPA filter. HEPA filters guarantee to help remove air particles that are very small, and it does it with good accuracy of over 99.97%.

  • Activated Carbon

The activated carbon filter present in this unit helps in removing gases and odors without the use of ionization and ozone. This can irritate some users, which is why GermGuardian doesn’t make use of it. However, carbon does not provide you with any health risk and is very efficient.

  • 3-in-1 Cleaning System

The GermGuardian model uses a pre-filter to help trap large particles before filtering air out through the HEPA filter. Also, this helps in removing particles as small as 3 microns. The final charcoal filter contains carbon, which absorbs odors and gases before circulating the purified air back in the room.


  • Noise

One drawback that this purifier comes with is noise. This model is not very quiet, and it can provide a noticeable noise, especially after a few days of usage. The low setting on this unit is perfect for anyone who can sleep through a quiet white noise. However, higher settings make it hard for light sleepers to sleep.


Overall, the GermGuardian AC4825 is a top-performing purifier present at this price range. Even though the noise level is not ideal for some users, its efficiency in cleaning the air is worth every penny. Any true HEPA filter purifier is very rare to find, and this makes this model stand out.

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