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GermGuardian - 3-in-1 True HEPA 167 Sq. Ft. Air Purifier - Gray

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GermGuardian 3-in-1 AC4825 True HEPA Air Purifier: The 3-in-1 filtering system keeps odors at bay, air clean, and helps prevent harmful growth of bacteria and mold. With an indicator light, you'll always know when to change out filters to keep the purifier running at optimal levels.
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    What's Included

    • 3-in-1 True HEPA Air Purifier
    • Owner's manual

    Ratings & Reviews

    Overall Customer Rating:
    96% of customers would recommend this product to a friend (1425 out of 1492)

    Energy Ratings


    Small bedroom capacity

    The 167 sq. ft. room capacity easily cycles fresh air throughout a single, small bedroom.

    Know when to change a filter or bulb

    A light indicator turns on and flickers when the filter or UV-C bulb needs to be replaced.

    Kills airborne germs and removes odors

    The UV-C light works to kill airborne germs and bacteria, while also reducing common household odor from pets, cooking and smoking.

    Helps prevent bacteria growth

    A charcoal filter contributes to the control and prevention of bacteria growth, germs, and mold.

    Low volume

    Quiet operation keeps noise at a minimum.

    True HEPA filter

    Captures 99.97% of dust and allergens. Multiple levels of cleaning capture allergens, kill airborne germs and bacteria.

    Customer rating

    Rating 4.6 out of 5 stars with 1492 reviews

    would recommend to a friend



    • Rating: 4 out of 5 stars

      Great Peace of Mind- Almost Perfect

      • Verified PurchaserVerified Purchase

      I have been running my air purifier 24/7 for almost 2 months now. I haven't had any problems with this unit. PROS: 1) Really cleans the air- after just a WEEK of use, the outer (carbon) filter was covered in dust! Disgusting, but I'm satisfied to know that wasn't in my lungs. I vacuum the filter once a week. 2) HEPA filter. Although I can't actually "see" what it is catching, I know it is helping my air quality! I live in Utah where the inversion pollutes the air on a regular basis during the winter. This air purifier gives me peace of mind, knowing that when I come home I am in a clean air environment. Not only that, but it catches dust mite allergens, pollen, plant spores, bacteria, fungi, mold, smoke, dust..... We are definitely sleeping better at night, not waking up with the usual "stuff" that you have to clear out of your throat in the morning... catch my drift? 3) UV light- peace of mind that the germs that are caught by this thing are killed. 4) Catches SMELL (carbon filter)- I am used to smelling leftovers when I let my pots/pans soak in the sink overnight. Not anymore! I know this works because one time we went out of town overnight and turned the unit off. When we came back, our apartment smelled like soaking dishes/leftovers. A smell I'm glad to be rid of using this unit! CONS: 1) When I first got this unit, the lowest setting was pretty quiet. It is noticeably louder now. However, at this setting me and my husband are still able to sleep with the unit in our bedroom at night. AKA not too loud for sleeping (and I used to sleep strictly with earplugs for 2 years straight, so that should tell you something!). Because the fan got louder, I rate this product 4/5 stars. I hope it doesn't continue to get louder. I will update if it does. 2) When we first used it, it did have a "new" or plastic/carbon smell to it. I imagine this was the carbon filter. The smell was gone by the second or third day. I recommend this product. It is the best Air purifier/HEPA filter you can get for this price range. Obviously if you spend more money, you can get a much better product that will cover more square footage. **IMPORTANT- the 22" model can be used up to 155 sq. ft. The 28" model can be used up to 193 sq. ft. Buy according to your needs. AKA, measure the living space you want to use this unit in. In bigger rooms you will need MORE THAN ONE UNIT if you want this product to work effectively. Just an FYI.

      I would recommend this to a friend

    • Rating: 4 out of 5 stars

      Work Great but Noisy at Highest Setting

      • Verified PurchaserVerified Purchase
      • My Best Buy® Elite Plus MemberElite Plus Member

      I'm using this in my master bedroom. My wife has three little, smelly dogs that she insists stay in the room with us at night. As you can imagine, the putrid odor from these mutts is horrific since they never get baths. And I have to constantly be on the lookout for stepping on urine or feces from these not-so-well potty trained mutts. Their dander and hair coats everything in the room like a fine powdery snow on a cold winter day. With the door closed at night, I feel that I'm trapped in a coffin deep under ground, struggling for one last gasp of fresh air. Every day since the dogs have entered my life, I ask myself if this is h-e-l-l. Then the GermGuardian 3-in-1 True HEPA Air Purifier came along. I turned it on for the first time and closed the door behind me. I came back in an hour later, and I was amazed at how much fresher the air was in the room. It's as if the GermGuardian uses tiny lasers to blast away odor particles in the room, rendering them inert. The deep fog of dust and dander that clouded the room summarily dissipated, leaving behind only pure, fresh, breathable air for the first time in many months. And I am starting to believe that maybe there is some hope for me on this earth, so there is no need to continue plotting my own demise. The only flaw with the GermGuardian is that it is very loud on the highest fan setting. Of course, there is no fan setting high enough to completely counteract the stench of the smelly mutts in my room, but the GermGuardian makes a valiant effort. I also wish there was a way to turn off the blue light for the UV lamp so I wouldn't have to turn that setting off at night. The blue light is blinding when you're trying to sleep, akin to staring at the midday sun. Of course, I've thought about sticking hot pokers in my eyeballs so I don't have to look at the piles of vomit and feces in the middle of the floor, so maybe this is blue light is a good feature. The bottom line is that I recommend this product. It may just save your life.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      fresh air

      • Verified PurchaserVerified Purchase
      • My Best Buy® MemberMember

      I purchased this about 4 months ago, and I have to say, it has changed my life! I have two large dogs and allergies. Though my dogs don't shed much, they still have dander and they used to send me into middle of the night asthmatic fits. I wasn't sleeping a full night through without a double dose of allergy medicine and an inhaler (and even then it was iffy)...Until I got the GermGuardian. Upon first use there was a little of that "new plastic smell," but it went away after about 36 hours of continuously running it. The first night I used it, I took my allergy medicine, but did not have to use the inhaler. Did not wake up once! The second week after using it, I noticed that there was less dust in our bedroom, and I had been able to take my allergy medicine less and less (now maybe once a week if that). In fact, I haven't touched my inhaler in over two months! I am going to buy a second (larger unit) for our upstairs living area. I take the smaller one upstairs while I'm cooking if I am making something that is really smelly (like fried fish or bacon) and run it while I cook. It really helps to minimize the amount of lingering odors. It would be nice to not have to move it around all the time! The best part though...In this yucky cold and flu season, I am pretty sure the GermGuardian kept me from getting full-blown sick! I started to feel a sore throat and stuffy, but it never broke out into a full cold. I have recommended this item to four people who ordered it, and all of them said that they are noticing a huge difference in the air quality in their home. ***ONE THING TO NOTE*** You have to rinse the thinner filter off about every two weeks (and be careful, it can tear easily). I don't recommend vacuuming it (I tore it up, and it didn't seem to get all the crud out). I usually just rinse it out in the tub with cool water and let it air dry for about 5-10 minutes. It will help prolong the Hepa filter in it.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Make no mistake, this has really helped!


      ***************I've only had my unit for 6 days now.****************** So I got the smaller of the two germ guardians because the smaller one was the only one that was in stock at the time; and I was desperate to find something to help my allergies. I got it and noticed a difference the first night after letting it run in the bedroom with the door closed for a period of around 12 hours. Nights previously were unbearable due to the worst pollen season in years. I also have a dog (does not shed), but I noticed more allergies after I got him. This has really done a lot to help allergies of all types. Prior to using the Germ Guardian, I was using allergy pills here and there that had little to no effect on me because the pollen has been so overwhelming this year. While I still experience plenty of allergy symptoms, this has alleviated them to the point that I do not have a stuffy nose at night anymore. Without this, I would have continued to have many nights of sneezing fits and light sleep. As far as odors go, it definitely *helps* but does not eliminate like some of the other reviewers seem to experience. My dog is not quite housebroken yet, and even though I have this running, I still experience plenty of bad odors. Sure they're not quite so bad; I would not base my purchase on the odor control aspect. Overall, I HIGHLY recommend this. It has been doing a tremendous job of capturing a lot of airborne dust and debris and other allergen-causing pollutants in the air. My nights have been significantly better by just using this unit; but I think allergy medicine still helps to attack the root of the issues.

      I would recommend this to a friend

    • Rating: 2 out of 5 stars



      With all the great reviews, I purchased 2 of these to replace my two, 14 year old ionic-type purifiers. Not that they were not working, they did very well at removing odors, not really capable of removing dust from the duct work, but I thought its time in case they stopped working with age. I have one of these GGuardians in the finished basement, moves the air around pretty well and will take in some dust particles but does not take out any cooking odors that may linger there, as the kitchen is at the top of the entrance. The other unit I have in the entrance of the kitchen which is quite small. I point it into the small area to get rid of cooking odors and it FAILS to do it, even on the high speed. It will remove some of the smoke if frying but the odor still reeks. I end up setting my old purifier and it will take care of the odors. Very disappointed in the removal of odors of cooking in such a small area and find it terribly frustrating to bring a 14 yr old purifier down to finish the job. Both my items were at full price, not on sale like they are now. This is my second attempt to send a review, the other never made it in. Overall I give a 2 only for the fan capability to move air and keep some dust at bay in the basement. The other gets a ZERO for my intended use in a small kitchen.

      No, I would not recommend this to a friend

    • Rating: 1 out of 5 stars

      Emits Strong Plastic Smell

      • Verified PurchaserVerified Purchase
      • My Best Buy® MemberMember

      I purchased this from a Best Buy retail store for a family member with respiratory issues in the hope that it would help. Upon bringing it home and setting it up in the room, the unit emitted a very strong plastic smell that actually made the family member worse! Exactly the opposite from cleaning the air that we expected. So, we moved it to another room in hopes that the smell would subside after a couple of days of use. It did not, so we returned this unit for another. Unfortunately, the second unit had precisely the same issue. I should also note that this smell was more acutely noticed by the family member with the respiratory issue in comparison to others in the family who were much less sensitive to it. We moved the second unit again to another room for about three weeks to see if it would abate with a longer time. The smell did reduce somewhat but it was still too strong and needed to be returned. That is where the second issue began! We tried to return the second unit to our local Nashua, NH Best Buy retail store but was denied a refund because Best Buy's return policy is now a mere 15 days which I was not aware of! This model clearly has a systemic problem that is more acutely sensed with people with respiratory issues. There are numerous reviews on Amazon purporting the same issue. Best Buy should have refunded my purchase of this defective unit. From now on, I will shop at Amazon who has a much better return policy and they stand behind their customers and products. What is the point of going to a retail store who doesn't take care of their customers? The Assistant Manager at this store just lost Best Buy a family of customers over a $85. purchase.

      No, I would not recommend this to a friend

    • Rating: 5 out of 5 stars

      Excellent value for the money

      • My Best Buy® MemberMember

      Finally after reading lot of reviews and suffering from allergies for almost 3 months into this terrible weather of NY, i finally decided to buy this purifier. I was a little cautious as some customers complained about having problem with some units, so i decided to go to store instead ordering online. While in store I asked the representative to turn it on for me so that I dont have to return from home. Out of the box, just plug it in and and is ready to go. Has 3 settings i,ii and iii. III is slightly louder but at I and II you wont even know if its on. We have a closed living room area and my wife loves to cook and fry things. So she decided to cook as soon as I turn the unit on. And we couldnt appreciate smell of cooked food where the unit was placed and as soon as she turned off the stove we couldnt even smell in rest of the living room area (my living room is approx 500 sq feet). Next morning I woke up without having to sneeze or having a stuffed nose (something very unusual for me). My son suffers from similar issues and he gets frequently sick (almost every month). I am hoping that this unit will continue to impact our life positively

      I would recommend this to a friend

    • Rating: 1 out of 5 stars

      What Good is a Warranty If you Keep Paying?


      I received the Guardian Technologies AC4825 germguardian 3-in-1 Air Cleaning System sometime shortly after October 3, 2015 (shipping date) and put it immediately into service. On December 19, 2015 I took the unit out of service and cleaned it in accordance with user manual. When I put it back into service, the UV light would not come on. Thinking I could have damage bulb by banging it while hot, I ordered a replacement bulb. On about December 27th, I received the bulb and replace the one in the unit. On placing the unit back in operation, the UV light would still not come on. On December 30th I called Guardian Technologies customer service. Although still under warranty, they advised me that at my own expense I could purchase packaging material and pay to ship the unit back to them (also asked me to insure it at my expense) and they would have a technician look at the unit. Let’s recap, unit broke in 3 months and I was to spend my own money to send it back to Guardian Technologies under warranty.

      No, I would not recommend this to a friend

    Product images, including color, may differ from actual product appearance.