2020 Buyer’s Guide: Germguardian AC4825 Review

| Last Updated: March 5, 2021

Regardless of the size of your home, there are various things that can disrupt the quality of air that you breathe. Cooking and cigarettes create smoke. Pets come with hair, odor, and dander. Dust shows up on all surfaces regardless of how often you clean. Air also contains many pollutants that can cause harm to our health. However, you can invest in a high-quality air purifier to get rid of nasty smells and airborne particles.

The GermGuardian AC4825 is one of the top-rated air cleaners produced by Guardian Technologies for use in small and medium-sized rooms. The company puts extra emphasis on improving the quality of human life with the help of their appliances. Progressive innovation and the high quality of their products have made this company one of the most trusted brands in the US.  

This 22-inch tower unit weighs only seven pounds and is widely used to clean the air from various possible contamination sources. It is Energy Star certified, as it complies with all the guidelines set by EPA (the U.S. Environmental Protection Agency).

The AC 4825 is equipped with a true HEPA filter that catches 99.97% of airborne particles. Moreover, UV-C technology keeps the air free from harmful agents that can cause allergic conditions.

  • Its unique three-stage filtering capability makes this purifier one of the best on the market.
  • Three-year warranty
  • Ease of cleaning
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Germ Guardian True HEPA Filter Air Purifier with UV Light Sanitizer, Eliminates Germs, Filters Allergies, Pollen, Smoke, Dust Pet Dander, Mold Odors, Quiet 22 inch 4-in-1 Air Purifier for Home AC4825E

Main Features

The GermGuardian AC4825 air purifier delivers both on efficiency and quality with its advanced technology and high-performance filter designed to remove small particles such as bacteria and viruses from the air. Its unique three-stage filtering capability makes this purifier one of the best on the market.

The first part is the pre-filter which is closest to the air purifier’s outer case. This captures all the large particles including pet hair, lint, and dust floating around in the air. This filter uses an activated charcoal filter which helps to get rid of all nasty odors that foul up the air in your home. These smells include odors from smoking, cooking, and pets, along with their litter boxes.

Next, is the true HEPA filter that is able to collect up to 99.97% of airborne particles that are as tiny as 0.3 microns in diameter including pet dander, dust mites, mold spores, and pollen.

The last filter uses UV-C light to filter the air. In this filter, the air is exposed to short range UV light (UV-C) which is known as the germicidal UV light and destroys pathogens like E Coli, Streptococcus, and Rhinovirus. The combination of these filters not only cleans the air, but it makes it healthier too.  

Moreover, the AC4825 comes with a three-year warranty, thus ensuring consumers of its superior quality and performance. Its sleek design makes it ideal for small to medium-sized rooms, while the UV technology makes this purifier strong enough to destroy germs, bacteria, viruses, and mold spores.

Another great feature of this air purifier is the ease of cleaning. The pre-filter and carbon filter are very easy to clean, while the HEPA filter lasts for up to eight months. When it becomes dirty, there is an indicator light on the top of this model which lights up indicating that it is time to change the filter, thus eliminating the need to clean clogged up filters.

Germ Guardian True HEPA Filter Air Purifier with UV Light Sanitizer, Eliminates Germs, Filters Allergies, Pollen, Smoke, Dust Pet Dander, Mold Odors, Quiet 22 inch 4-in-1 Air Purifier for Home AC4825E


Still confused if this is the right pick? Check out these pros:

Low Noise Level

The AC4825 has three fan settings – low, medium, and high. When the fan speed is low, the unit is so quiet that there is hardly any noise. Similarly, if it wasn’t for the large blue LED light, you would not know if the cleaner was working at medium speed. When running on high speed, the unit emits a noise similar to white noise, which although loud, is not irritating and does not disturb your sleep. The high speed is recommended for efficient and swift cleaning of contaminated air like dust and smoke.

Ease of Use

The GermGuardian AC4825 is completely assembled and ready to work when you take it out of the box. Just plug it in, and in a few minutes, you can breathe in the fresh air. The three fan settings can be easily adjusted with the help of a handle. The control buttons are present at the top of the unit, thus eliminating the need to lean in order to operate it. Moreover, this unit is very lightweight, making it is very easy to carry from one room to another. Its built-in handle allows it to be placed easily on countertops or tabletops.


CADR refers to the unit of measurement that shows how well the air purifier cleans the air in a room. The GermGuardian AC4825 has the CADR ratings of 108 for smoke, 125 for pollen, and 118 for dust, thus ensuring that this unit works best in a room of 167 square feet. It takes 10 to 15 minutes at the rate of 118 cubics per feet to efficiently clean a room from dust, smoke, and other allergens.

Low Power Consumption

The purpose of an air purifier is to clean the air in the room. However, if you turn it off, the air will start collecting these airborne particles again, which is why it is recommended that you keep the air purifier constantly running, especially when you are at home. You might wonder if running it for long periods will increase your energy bill, but that is not so because the AC4825 has Energy Star and AHAM certifications. This ensures that the air purifier meets all the energy standards, consumes low amounts of energy, and is environmentally-friendly.

Great Value for Money

Although there are a wide range of air purifiers available in the market today, the GermGuardian AC4825 is hands-down the best air purifier in this price range. Although it does not have any fancy bells and whistles, its three-stage filtration system ensures fresh and clean air, thus making it well worth the money that you are spending.

Germ Guardian True HEPA Filter Air Purifier with UV Light Sanitizer, Eliminates Germs, Filters Allergies, Pollen, Smoke, Dust Pet Dander, Mold Odors, Quiet 22 inch 4-in-1 Air Purifier for Home AC4825E


Of course, everything is bound to come with some drawbacks. For the AC4825, these include:

Some People Find the Highest Setting to Be Very Loud

When operating the GermGuardian AC4825 at the highest setting, the noise level is only 55 decibels, which is close to the noise level of an air conditioning unit at 100 feet. Some people may find this very loud, thus rendering it unsuitable for bedrooms or small spaces.  

Replacing HEPA Filter Every Few Months Can Increase the Cost

The HEPA filter in this air purifier needs to be replaced every 6-9 months depending on the environmental contamination and frequency of device operation. This increases the overhead cost of running this air purifier.

Some People May Find the UV Light Very Annoying

The blue UV light on the top of this unit can be annoying especially in a dark room or when you are trying to sleep.

What is the Germguardian AC4825 Best For?

Research has shown that indoor pollution can be five times as concentrated as outdoor pollution. Many manufacturers have been trying to create premium products that can clear pollutants, odors, and allergens with minimum hassle and maximum efficiency.

The AC4825 is such a machine which has great performance but a very low price in comparison. It is great for people who live in places where air quality is very low. However, it is suitable for rooms that are up to 155 square feet.

It is also great for people who have asthma or serious allergies to airborne particles. The AC4825 is designed with a combination of UV-C light filter and a true HEPA filter, which cleans the air and gets rid of germs and bacteria, thus leaving the air clean and fresh.  

This air purifier is also best for people who are on a budget as this is a very economical unit. At this price, you will not be able to get such a high performing air purifier.

However, this air purifier is not a machine built to handle smoke. Although this unit has an activated carbon filter, it does not have enough carbon to be effective against large amounts of smoke or other intrusive odors.

Bottom Line

The GermGuardian AC4825 is one of the nicest-looking air purifiers with an efficient air filtering system. It ensures that various contaminants present in the air are eliminated before they reach you. This unit is ideal for small-sized homes because of its many great features such as UV-C light, three-stage filtration system, and portable, slim design.

It is not only easy to use but is also highly affordable. It can greatly help people with asthma and allergies. When running on low and medium speeds, it is so quiet that it is hard to hear. This silent performance enables this purifier to work at night without disturbing your sleep. This low noise pollution also allows you to concentrate on your work without any difficulty.

Once you buy this product, you can use it for several years, as it is a complete package with strong air rotation and a quick benefit of cleanliness in the air. Although you may need to replace the HEPA filter periodically, the initial low cost makes it worth getting for anyone who wants cleaner, fresher air in their homes.

My name is Bob Wells and I am a retired HVAC tech from Washington state. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. Find more info about me and HVAC Training 101.