GermGuardian Full Room Air Purifier

Last updated date: November 13, 2019

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We looked at the top 1 Air Purifiers and dug through the reviews from 5 of the most popular review sites including BestReviews, The Spruce, Healthy But Smart, The Air Geeks and more. Through this analysis, we've determined the best Air Purifier you should buy.

Overall Take

The GermGuardian does solid work without a lot of bells and whistles, at least on the outside. It's easy to use and replace the filters on, but the extra charcoal filter (and optional UV-C light) make it equally good at trapping odors and allergens. And with a low power consumption, it's ideal for heavy use in medium-sized rooms. In our analysis of 49 expert reviews, the GermGuardian GermGuardian Full Room Air Purifier placed 8th when we looked at the top 13 products in the category. For the full ranking, see below.

Editor's Note November 13, 2019:
Checkout The Best Air Purifier for a detailed review of all the top air purifiers.

Expert Summarized Score
5 expert reviews
User Summarized Score
10,438 user reviews
Our Favorite Video Reviews
What experts liked
An affordable option from a trusted name in the industry. This model effectively reduces pollutants in rooms up to 390 sq. ft. using HEPA filters that are easy to install and inexpensive to replace.
- BestReviews
The GermGuardian removes most of the contaminants in the air. Its 3-in-1 filter design makes it possible for the purifier to get rid of particles, germs, and odor from the air.
- HouseholdMe
This top-rated air purifier from Honeywell is effective on particles as small as .3 microns, and it will capture things like pollen, dust, mold, pet dander, smoke, and germs.
- The Spruce
January 5, 2019 | Full review
Changing the filter is very easy and doesn’t require any tools.
- Healthy But Smart
December 13, 2018 | Full review
Its 3-in-1 filter design enables it to remove particles, germs, and odor from the air.
- The Air Geeks
What experts didn't like
A few units have been known to rattle, but this isn't a consistent problem with the entire product line.
- BestReviews
The air cleaning effectiveness is lower when the air purifier is placed in relatively large rooms.
- HouseholdMe
One of the major downsides to the GermGuardian AC4825 is that there is a little window at the top that lets the UV light shine through. This blue light is really distracting in a dark room. It is not ideal for trying to watch a movie or sleep.
- Healthy But Smart
December 13, 2018 | Full review
Their air cleaning effectiveness is lower when the unit is employed in relatively large rooms.
- The Air Geeks

From The Manufacturer

The 3-in-1 HEPA Filter Air Purifier for Home is perfect for allergy sufferers. The HEPA air filter captures 99.97% of dust and allergens as small as .3 microns in size! More than just a filter, the UV-C light kills germs, while the charcoal filter captures odors. Standing 22 inches tall, this air cleaner is lightweight and ideal to use in rooms up to 167 sq. feet. Includes a UV-C control and a filter change indicator. Choose from 3 speeds, including a low speed that runs ultra-quiet

Overall Product Rankings

1. Coway Mighty Air Purifier
Overall Score: 9.5
Expert Reviews: 10
2. LEVOIT LV H132 Air Purifier
Overall Score: 9.4
Expert Reviews: 0
3. Winix 5500-2 Air Purifier
Overall Score: 9.3
Expert Reviews: 0
4. Pure Enrichment PureZone True Purifier
Overall Score: 9.2
Expert Reviews: 0
5. Alen BreatheSmart Air Purifier
Overall Score: 9.2
Expert Reviews: 4
6. IQAir HealthPro Plus Air Purifier
Overall Score: 9.0
Expert Reviews: 3
7. AirMega 400 Air Purifier
Overall Score: 8.9
Expert Reviews: 3
8. GermGuardian Full Room Air Purifier
Overall Score: 8.7
Expert Reviews: 5
9. Blue Pure 411 Air Purifier
Overall Score: 8.6
Expert Reviews: 4
10. Blue Pure 211+ Air Purifier
Overall Score: 8.6
Expert Reviews: 5
11. Whirlpool Whispure Air Purifier
Overall Score: 8.2
Expert Reviews: 4
12. Honeywell True HEPA Allergen Remover
Overall Score: 7.7
Expert Reviews: 4
13. Austin Air Healthmate Standard Air Purifier
Overall Score: 6.6
Expert Reviews: 2

An Overview On Air Purifiers

The reasons for buying an air purifier can be as numerous as the number of pollutants in the air — and indoors, that number tends to be bigger than most people would expect. Despite the best efforts of the filters in our air conditioners, pollen and dust particles can settle into carpets and upholstery. Mold spores can grow in moist areas. And if there are pets or smoke involved, expect dander and carcinogens to be part of every breath.

Whether you suffer from allergies or just want to eliminate the smell associated with all this particulate matter, a good air purifier can be an essential accessory in any room. But how are they different from the filters we already have in our regular AC?

All that depends on the purifier. Most models circulate air through a HEPA (High-Efficiency Particulate Air) filter, and often more than one. HEPA filters are certified to trap particulate matter as small as 0.3 microns, which covers dust, pollen and most bacteria. Some purifiers boast a medical-grade Hyper-HEPA filter that will go down to 0.003 microns — enough to pick smoke out of the air.

In conjunction with this, the more high-tech air purifiers can employ an extra line of defense. The Germ Guardian uses an optional UV light that renders many micro-organisms sterile, and an activated charcoal filter that can actually pull in and neutralize toxins through electrostatic attraction. There are also models like the Coway Mighty Air Purifier that can ionize incoming particles, which are then sucked in by metal plates or other treated substances.

A word of caution on ozone, though. While they’re less common these days, some air purifiers generate ozone, which, according to the manufacturers, can deodorize and disinfect the air. The jury is still out on those claims, and in fact the presence of ozone in confined spaces can be more harmful than the pollutants you’re trying to get rid of.

For a measure of general effectiveness, you can look for a rating on most air purifiers called the CADR — Clean Air Delivery Rate. It’s a number that represents the cubic feet per minute (CFM) of air that has been cleared of all the particles of a given size. These ratings are recognized by the EPA and can be found on most devices. If you can’t find them, the number is fairly easy to calculate: Just take the CFM on the air purifier and multiply it by the percentage of a certain particle (smoke, pollen, etc.) that the machine can remove.

DYWM Fun Fact

That air purifier humming away in the corner of your room may look tranquil, but it was initially created for military use. The HEPA filters that are so common today were first employed to keep lab workers safe at the Manhattan Project, the 1940s scientific effort that led to the creation of the atomic bomb. Back then, scientists were less concerned with their ability to keep their allergies in check. They were using the filters to block out as much radioactive material as possible.

The Air Purifier Buying Guide

  • One of the first things you’ll want to consider when buying an air purifier is the kind of room you’ll be using it in. When it comes to price, this is usually the primary factor. A workhorse unit that can handle an entire living room and kitchen is going to run you significantly more than a machine that’s meant for a home office (the Coway Mighty) — for good reason.
  • Are you looking for protection from allergies or just need to freshen up the air? A quick look at the specs for the purifier should tell you what particles it can effectively remove from the air. Again, a HEPA filter is going to do the trick for most common irritants and odors, including pet hair and dust. But if you live in a smoker’s house, look into something more robust.
  • Much like your air conditioner, you’ll likely be keeping an air purifier on for as long as you plan on breathing the air in that room. In a lot of cases, that might be all day, so power consumption matters. Frugal users might want to check out the wattage specs on prospective models. There are also features that can mitigate that electricity drain, such as timers. In most cases, your air purifier won’t be running all the time. It’ll cycle the air through a few times an hour, and you can adjust that number more or less with most models.
  • Another thing to figure into your price point are the filters. Like your AC, there’s upkeep involved. Check not only the price of your filter, but the frequency with which you’ll need to replace it.
  • Since they’re meant for indoor use, most air purifiers are better looking than, say, that wall AC unit you had in your dorm room at college. That said, few people want them as the focal point in a room. If you’re getting one for a small room, you likely want a small purifier — or at least one that’s nondescript. Sleekly designed at less than 17″ x 19″, the Coway Mighty fits the bill on both counts.