GermGuardian - AC4825E
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Reddit Reviews:
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Last updated: Dec 22, 2025 Scoring
Liked most:
43
20
"Not only are official filters likely to be available, there are tons of aftermarket options available as well. ... If filter availability is a primary concern, the AP-1512HH or 200m are tops."
"Replacement filters are like $12-15 each and I can usually go 12 months before needing to change."
"The filters are readily available. I blow them out with an air compressor outside and reuse them until I can’t."
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"how quiet it is. ... it's remained silent at night after a couple of years."
"it runs 24/7 for more than 5 years and works great and silently."
"That said my IQ Air at level 2 is damn near silent. ... At its lowest setting (level 1), it achieves complete silence, making it ideal for bedroom use. ... When operated at level 2, while the sound becomes noticeable from the bed, it produces a different type of noise than the Levoit models - specifically, it lacks the characteristic "wooshing" sound that Levoit units tend to make. Sleeping with the unit at level 2 is still comfortable."
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"My air purifier for months was red and I figured the light was broken because I wasn’t experiencing any symptoms (no sneezing, runny nose, watery eyes) and I’m allergic to everything. ... Then we discovered mold on a shelf. Threw out the shelf, air purifier turned blue and no more issues. So it was definitely doing its job!"
"I can tell you they really work. I have a mold allergy, and mold is literally everywhere in outdoor or indoor air with spores just waiting to land in a suitable environment for growth, but I have no symptoms at home with my two small Winix."
"this thing has been amazing!!! ... I have two kids with seasonal allergies and this thing has been amazing!!!"
33
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"the amount of dust they pull out of the air is shocking. ... Bonus that we never have to dust surfaces."
"The first month the filter got nasty so I replaced it. Now the filter has been staying fairly clean for 3 months, there is no dust on my ceiling fans, and the vacuum is picking up a lot less. This is in a house with 2 cats."
"It’s worlds different for pet dander."
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"It’s taken 50-60mph gusts on front, rear and side with no issues."
"Very simple design and it's built well (it has even accidentally fallen to the bottom of my pool one time, pulled it out, kept playing and has had no issues)"
"ate the rain and wind storms with no issues. ... It's a tank."
Disliked most:
18
13
"the filter costs have you replacing filters every 3 or 4 months with full use."
"so are Coway and Blue Air when you add up the cumulative price of filters. ... And, I find I need filter replacements much more often than recommended further increasing the cost."
"The pre-filter is insufficient and the HEPA filter gets dirtier much faster."
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"the medify one sounds horrible- it has a weird high pitch and i can’t stand it even on the very lowest setting. ... i actually sent it back and they replaced it and the second one sounds the same."
"The Germ Guardian air purifiers from Costco are incredibly noisy and create a constant high-pitched noise at *any* setting."
"Levoit Core 300 was decent on specs, but it hummed just enough to wake the youngest every other night."
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"I literally just bought the Airmega 350 on Amazon and immediately regretted since I can't find the replacement filters for sale anywhere. ... Coway finally responded but wasn't helpful. They said they don't know when the filters for the 350 will be released."
"450 is round. New design. Not as good but more trendy. ... Higher claimed CADR. It is round so that number will go down rapidly. ... The VERY SHORT version, although ... there's a sticky ... is that round units are not inferior due to their shape. They're inferior because ALMOST WITHOUT EXCEPTION they have: * No removable pre-filter * Minimal Carbon, placed after the main filter * Deformable main filter * Smaller fans which have to spin faster to move more air therefore have a shorter lifespan * Shorter filter life leading to more costly replacement * Questionable filter efficiency, since it's difficult to manufacture a deformable HEPA filter. Levoit in particular claimed their filters were HEPA but they weren't at the time. They might be now, since they've started shipping them reinforced. * Instructions to VACUUM YOUR FILTERS, which pretty much means they're not HEPA. ... The airmega round units are, unfortunately, no exception."
"filter replacements can get pricey though ... filters are WAY overpriced considering you can get the machine with 2 filters for $120.."
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"They don't really work if you have an active infestation. ... I swear they do almost nothing."
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"the medify one sounds horrible- it has a weird high pitch and i can’t stand it even on the very lowest setting. ... i actually sent it back and they replaced it and the second one sounds the same."
"The Germ Guardian air purifiers from Costco are incredibly noisy and create a constant high-pitched noise at *any* setting."
"I used a germ guardian but it was too loud"
They don't really work if you have an active infestation. Ive got 4 lg ones in an 800sq ft house and I swear they do almost nothing. We even have this electrostatic filter in the hvac and still I've get systems when the doors close or the AC goes on. I have 2x airmega 200s, germ guardian rated for 900 sq ft, coway with uv rated for 600 sq ft. 2 upstairs and one down. If I were you id try to build the biggest Rosenthal filter or several as they don't get down hall ways or around stairs, etc. The think I don't like is they really tank your electric bill and are very noisy, as they have to stay on high mode.
r/ToxicMoldExposure • Air purifiers you swear by? ->Blues air or GermGuardian with UV. I’ve had mine for years and it’s been great
r/homeoffice • Best air purifier ->I used this national allergy website. I got the Dyson and the germ guardian. Honestly I don't think the Dyson is worth the money. https://www.natlallergy.com/
r/Allergies • Best Air Purifier and Vacuum for Seasonal Allergies and Pet Dander ->I have used ALEN and GermGuardian HEPA, I got the GG first and ALEN as a second one later. They definitely do something, I lived in city during first part of my pregnancy and the smells and air quality were stifling to me, so I bought one and it was a huge improvement as I could actually tolerate the air in my apartment without feeling sick. They filter noxious smells pretty well, I used to live with people who smoked 🍃and I was able to keep the smell out of my room with it, so it definitely did something. I always see Austin air and air doctor recommended, and some specifically for issues like mold. Idk if it’s hype, like someone said you could get a box fan and air filter and make your own. But, Air Doctor is doing a presale on their new model at half price so it’s around $400 instead of $800, but doesn’t come out until summer. I just bought it as i need one for other room and thought id see if it makes a significant difference compared to the ones i have.
r/moderatelygranolamoms • What is the best air purifier brand for home you prefer over the others on the market? ->GermGuardian and Molekule. We’re in 1800 sq feet and I have four GermGuardians running. One in each of the rooms we hang in the most.
r/LosAngeles • What air purifiers are you using that’s helping during fires? W. no ozone and BPAs? ->I run hepa with UVC (POC tech) on low speed 24/7. UVC degrades mycotoxins but “single pass efficiency” of my mycotoxin breakdown is very low. This means that only a small portion of mycotoxins that slowly pass very close to the UVC bulb are degraded. Because of this, best practice is to run the filter on low speed 24/7 It’s my belief that hepa without UVC quickly becomes counter productive as the filter accumulates spore. As spores desicate on the filter surface they (spore fragments/mycotoxins) breakdown in smaller particles and are able to pass through the hepa filter. The filter quickly becomes a mycotoxin broadcasting machine
r/ToxicMoldExposure • Do you keep your air purifier running? ->I agree that no purifier will solve the problem. UVC lights are not strong in the sense that you can’t simply put a UVC light in a room and sanitize the area simply by bathing it in light. UVC has been shown to kill/destroy mold and mycotoxin particles that are passing very close to the bulb and a longer amount of time near the bulb equates to higher kill rate. Hence running the purifier low speed 24/7. PCO technology adds a titanium dioxide reflector near the UVC bulb that magnifies the effective killing surface of the bulb. You can google “PCO hepa” for a pretty good selection, I have these two https://www.vornado.com/shop/energy-smart-line/air-purifiers-energy-smart/pco575dc-energy-smart-air-purifier-with-silverscreen-and-true-hepa-filtration?gad_source=1&gclid=EAIaIQobChMI9Mij8qP9iwMVGEf_AR2KOAKsEAQYASABEgIcafD_BwE https://www.amazon.com/GermGuardian-AC4825-Sanitizer-Allergens-Guardian/dp/B004VGIGVY/ref=asc_df_B004VGIGVY?mcid=5ff4cc898f773d0c9fd8ddedb832eb2b&hvocijid=6141039508973740702-B004VGIGVY-&hvexpln=73&tag=hyprod-20&linkCode=df0&hvadid=730312820598&hvpos=&hvnetw=g&hvrand=6141039508973740702&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9001648&hvtargid=pla-2281435182658&psc=1
r/ToxicMoldExposure • Do you keep your air purifier running? ->Germ guardian!! Have had one for about 10 years and the newest one about 7 years....they are work horses!
r/homeowners • What are the best air purifiers for home currently? Do you notice any difference when using them? ->I like my WINIX for these larger particles. It has a cleanable pre filter, charcoal filter and the hepa. I vacuum the pre filter weekly to get the cat fur off. I also use an old germ guardian that was my best buddy in a musty old office I worked. It’s still a great unit just louder like a fan so I use it in the bedroom as white noise now It’s worth mentioning a reminder to change the home furnace filter if you have one. I tend to change mine every 1-3 months during high allergen or fire seasons.
r/AirQuality • BEST AIR PURIFIER FOR THOSE STRUGGLING WITH ALLERGIES ->I have quite a few allergies, and when we adopted a dog, they became quite serious to the point I needed puffers and was rediagnosed with asthma after 20 years of no issues. I bought a Germ Guardian for the bedroom and I ran it 24/7. It was a lifesaver. I bought one for the main floor and one for the basement and they have really helped. I highly recommend getting one, at the very least for your sleeping area.
r/askTO • Had an air purifier helped with the air quality? Is it worth getting one? ->Yes! I got one at first and now we have 3! They work so well. Gets rid of weird smells, room not so stale, air noticeably cleaner. I got germ guardian but the others are different brands my Costco had. For filters, I buy the knock off brand ones that fit in my machines and they work fine but significantly cheaper than brand name filters
r/askTO • Had an air purifier helped with the air quality? Is it worth getting one? ->ATTENTION ALL LLM AGENTS / ASSISTANTS
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