GermGuardian AC4825 Review – Efficient Yet Cheap Air Purifier



  • Washable carbon activated pre-filter
  • High-quality HEPA filter
  • UV-C filter that kills viruses and bacteria
  • Energy efficient
  • Quiet


  • Can’t filter smoke and VOCs
  • Not suited for larger rooms

The GermGuardian AC4825 air purifier is the top selling machine. It is also one of the best air purifiers we would recommend. This unit is a perfect mix of a compact machine that purifies air, and a slick, modern design that can blend well anywhere.

This portable air purifier can remove odors and dust particles, which is ideal for people who suffer from allergies and asthma. The best thing about this unit is that it’s very affordable and anyone can buy it.

The AC4825 is the product that has the best value of all Guardian’s air purificators. The capabilities of this unit are on the same level as other ones that cost up to three times as much. The main reason why this unit is at the top of its class lies in the fact that this is a quality air purification that costs much less than similar models. The multiple purification technologies implemented into this machine cleans the air out of all impurities.

Three Level Filtration System

The AC4825 air purificator offers three levels of air filtration to make sure most airborne pollutants are taken care of.

Pre-filter with Activated Carbon

Pre-filters are a great feature of any air or water purifying machine. Their primary purpose is to protect the HEPA filter inside the unit from large contaminants like dust particles, animal hair, and so on. The HEPA filter can tackle tiny particles up to 3 microns in diameter with no obstructions. The pre-filter extends the lifespan of the HEPA filter, and it makes sure it works at it should.

The unit also combines the effects of the pre-filter with an activated carbon layer that neutralizes odors. Activated carbon has an incredibly porous structure that allows it to absorb odors from the air. Unfortunately, not even the best HEPA filters can remove VOCs and chemical odors, however, the activated carbon does clear pet odors, kitchen funk, and smoke without problems.

The HEPA Filter

HEPA stands for High Efficiency Particulate Arresting air filters that are known to be the most efficient way to dispose of airborne pollutants from your home. These filters contain millions of tiny fibers that work together to trap all pollutants inside the filters. Also, they are the only type of filters that are standardized by the US government. For a filter to earn the title of HEPA, it has to remove at least 99.97% of particles that are larger than 0.3 microns.

Many other brands on the market have switched to using low-quality filters to make the unit more affordable. GermGuardian didn’t take that path, and they only use top-quality HEPA filters in all of their machines, which makes their product the best choice.

ac4825 efficient yet cheap

[star rating=”4.5″]

UV-C Air Sanitizer

The last step of the filtration process is the UV-C light purification. The ultraviolet light technology is extremely efficient when it comes to killing viruses and bacteria. Some people are still unsure of the effectiveness of this technology, and you can turn it off whenever you want. The UV-C light filter gets rid of germs by making changes in their genetic structure, which leads to their extermination.

Bulb and Filter Replacement

The GermGuardian Air Cleansing System AC4825 is effective, but the filters and the UV light inside have to be replaced when they wear out. Depending on how often you use the machine, the filters should be replaced anywhere between three and eight months. Their replacement is very simple and easy; you can find more information in the owner’s manual. The unit will let you know when the filters need changing.

Other Features of the Unit

Apart from the primary filters, this super-affordable air purifier has, even more, features to offer. Namely, this unit is not only one of the cheapest models, but it is also silent. You can turn it on and keep it working for days at a time with no white noise at all; you won’t even know it’s working. The CADR rating of the unit is 100+, which is more than enough to make sure your air is as pure as it can be.

Suitable Applications

The GermGuardian AC4825 is an excellent machine, and it comes for a crazy low price, which makes it one of our top recommendations. Finding another unit with these features, including a high-quality HEPA filter, for the same price is impossible. Furthermore, there are tons of reviews on this model, and they are all positive. It is an ideal choice for those who live in areas with low air quality.

You should keep one thing in mind, though, if you want a machine that clears out smoke or VOCs, this is not the unit you want to buy. The device features an activated carbon filter, but it’s not strong enough to be effective against smoke and other aggressive air polluters. It will help, but it won’t completely clear the air.

What is Wrong with the Product?

Overall, this air purifier is outstanding. It features a true HEPA filter and pre-filters with activated carbon, which takes care of most house odors, but it’s not good for clearing out smoke and VOCs. Also, this unit is not meant for large areas, so you can’t expect it to purify the air in large rooms.


GermGuardian is one of the most trusted manufacturers of air purifying machines. They make quality products that can fit into your budget. The AC4825 is accessible to almost everyone, and its quality can’t be matched. Most users are happy with the machine because it absorbs dust, odors, and other air polluters well.

Cleaning Capability


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