GermGuardian AC4825 3-in-1

GermGuardian AC4825 3-in-1 Review: 9000+ Reviewers and counting!

The highly popular, 22-inch GermGuardian AC4825 3-in-1 sanitizer is considered one of the entry-level tower air purifiers from its AC series. Featuring a multi-stage filtration with UV-C light,  you would need to compromise on a few convenience features given its low price tag. Here's the question. Why is GermGuardian AC4825 3-in-1 so popular and does the air purifier offer enough filtration performance in the likes of AC5000 or AC5250PT? Continue reading to find out.
± 149.99 p
     Annual filter ^    
± 72 - 100 p
Online price*
Latest Amazon price

GermGuardian AC4825 Specification

ProductGermGuardian AC4825
5.5 x 21.5 x 9 in
(14 x 54.6 x 22.9 cm)
Weight7 lb (3.2 kg)
Coverage (up to)155 sq. ft. (14 m2)
Dust free (CADR)
Pollen free (CADR)
Smoke free (CADR)100 cfm (170 m3/h)
Airflow speed
- Lifespan
- Replacement cost ($)
Charcoal pre-filter
6 - 9 months
HEPA filter
- Lifespan
- Replacement cost ($)
True HEPA filter
6 - 9 months
Carbon filter
- Lifespan
- Replacement cost ($)
Ionizer/ Technologies
UV-light/ PCO
LB4000 UV-C Light
10 - 12 months+- 24.99
Other filter
All-in-one filter
- Lifespan
- Replacement cost ($)
FLT4825 Filter-B True HEPA
6 - 9 months
+- 34.99
Optional/ Addon
FLT22CB4 Carbon Filter (4 pack)
+- 14.99
FLT4850PT Filter-B-Pet True HEPA
6 - 9 months+- 39.99
Noise level
Power consumption
Timer/ Scheduler
More color options
Auto mode
Air qualityAQ indicator
Filter change indicator
Wi-Fi/ BTBluetooth
Remote control
Child lock
Warranty3 years
Email/ Phone support

Product image

GermGuardian AC4825 key features

  • 4-stage filtration with 3 speed (Low, Medium, High)
  • True HEPA filter with 99.97% filtration rate and capture particles as small as 0.3 microns
  • Charcoal pre-filter
  • Optional UV-C light technology with Titanium Dioxide
  • Quiet operation
  • 3 years warranty

GermGuardian AC4825 review

  • Inexpensive especially after the online discounted price.
  • Decent but not over the top CADR for an air purifier of its price range.
  • Use True HEPA filter instead of HEPA-type filter found in tower air purifier.
  • UV-C light is effective in eliminating airborne mold, bacteria, and viruses.
  • Extended 3 years warranty is a given for GermGuardian models.
  • The total annual filter replacement cost is close to the price of a brand new AC4825.
  • The combined charcoal pre-filter smoke filtration is less effective than a pure granular type, activated carbon filter.
  • Uses a smaller UV-C light compare with AC5000 series.
  • Slightly troublesome to replacing UV-C light as you are required to unscrew 2 screws to pull out the bulb.
  • No timer, Auto mode, and air quality display.

The starters

GermGuardian AC4825 dimension
5.5 x 21.5 x 9 in
(14 x 54.6 x 22.9 cm)
GermGuardian AC4825 weight
7 lb (3.2 kg)

Almost a mirror to AC4850PT, GermGuardian AC4825 5.5 x 21.5 x 9 in dimension and 7 lb weight is far taller from your typical compact size tower air purifier. Given its slim body, the overall design feels very tower-fan like that most people would not be able to tell apart. There is a base at the bottom to boost the sturdiness while a carrying handle can be found at the back. One thing that is unorthodox about the ventilation placement is air inlet is located at the back while the air outlet is located at the front. On the whole, the air purifier lack premium touches and fitting quality, there is a nice blue strip light at the front that help enhances the overall black housing exterior.

GermGuardian AC4825 Control Panel

Moving to the top control panel, there are only 2 controllable switches you can play around with and a Filter Change indicator light. The main one is the Power knob that you can turn from off to Low, Medium or High speed. Below it is the UV control button that will activate/ deactivate UV-C light filtration. Last hidden function that is not shown on the control panel, you can reset Filter Change Indicator light after you have replaced with a new filter. Press and hold the UV control button for 5 seconds and the indicator will change from flashing red back to green light.

Airflow, speed, and CADR

GermGuardian AC4825 coverage
Purifying coverage
155 sq. ft. (14 m2)
GermGuardian AC4825 fanspeed
GermGuardian AC4825 3 speed can cover a below average 155 sq. ft. size purifying coverage that is deemed suitable for small room size. Airflow delivery rate is consistent and punchy but does not purify quick enough to cover an entire living hall unless you leave it on for a couple of hours at max speed. The air purifier is probably best used in close range or bedroom.
GermGuardian AC4825 smoke CADR
Smoke CADR
100 cfm (170 m3/h)
With no official CADR released for dust and pollen at the point of this writing, the smoke CADR stands at 100+ cfm. Not great but certainly not hopeless against airborne pollutants. With that, we can also conclude dust and pollen CADR should be around the same region. Again compared with GermGuardian AC4850PT or AC5250PT, the overall clean air delivery rate is identical.

What’s inside count

GermGuardian AC4825 Pre-filter
Charcoal pre-filter
6 - 9 months
GermGuardian AC4825 HEPA filter
True HEPA filter
6 - 9 months
GermGuardian AC4825 UV-light
LB4000 UV-C Light
10 - 12 months
^ GermGuardian AC4825 filters/ technologies/ lifespan
Arguably the biggest selling point of GermGuardian AC4825. For a tower air purifier that has limited filter space, the air purifier is equipped with a 4-stage filtration (3-stage officially) that covers all sort of airborne particles. First, there is a charcoal pre-filter that can trap large particles along with some light smoke and odor. Continue on that path is a True HEPA filter that traps smaller, micron size particles escaped from the pre-filter. Unlike GermGuardian AC4850PT or AC5250PT, there is no Pet Pure antimicrobial agent coating that inhibits the growth of bacteria and viruses. What is included though is the bulb powered UV-C light that is effective in eliminating airborne allergens and germs trap inside the air purifier.

Covered against

GermGuardian AC4825 VS Dust



GermGuardian AC4825 VS Pollen



GermGuardian AC4825 VS Hair

Hair/ Pet hair


GermGuardian AC4825 VS Dust mite

Dust mites


GermGuardian AC4825 VS Mold/ Mildew

Mold/ Mildew


GermGuardian AC4825 VS Pet dander

Pet dander


GermGuardian AC4825 VS Virus/ Germ

Virus/ Germ


GermGuardian AC4825 VS Tobacco smoke

Tobacco smoke


GermGuardian AC4825 VS Chemical



GermGuardian AC4825 VS VOCs



GermGuardian AC4825 VS Smoke/ Gas

Smoke/ Gas


GermGuardian AC4825 VS Odor



GermGuardian AC4825 small 155 sq. ft. purifying applicable area plus carbon pre-filter can capture dust, pet hair, cooking smoke, cigarette smell and household odors that flows within its area. Supporting that is the UV-C light and HEPA filter that will do a better job in remove airborne pet dander, dust mites, fungi, pollen, mildew, mold, and microscopic germs.

Keep it down

GermGuardian AC4825 generated noise through our naked ears is low with little audible sound at Low speed, louder but bearable at Medium speed and loud at Highspeed. For nighttime use place close to bed, we reckon the first 2 speed will be fine. On to power consumption, the below average airflow delivery rate demands little power at low speed and gradually moves up at a higher speed. UV-light plays a little part in power usage. No auto or sleep mode function so the current speed you selected will determine the usage level throughout the day.

At what cost

GermGuardian AC4825 MRSP/ RSP
+- 149.99
GermGuardian AC4825 annual filter replacement cost
Annual Filter Cost
+- 72 - 100
^ Replacement filters/ estimated cost
Still a very popular air purifier despite the replacement models is already out, GermGuardian AC4825 is at borderline cheap (after discount) for a full-size tower air purifier with 4-stage filtration. Annual filter replacement cost is inexpensive but at around the price of a brand new model. No a big problem, unless the indoor air quality is really bad that pushes the filter lifespan. You probably could save up even more if you do not utilize the UV-C light. Personally, we would go for the higher spec model GermGuardian AC5250PT that offers more for around the same price bracket.
The best place to buy GermGuardian AC4825 is at Amazon as the discount is huge, more than the official website or other retailers like Walmart, Target, BestBuy. You will also enjoy hassle-free shipping and return if you are not satisfied with the product. Keep in mind that pricing will fluctuate according to season and availability. Do check with the respective retailer from time to time.

GermGuardian AC4825 VS the challengers

Levoit LV-H132

Not a head-to-head competitors, LV-H132 actually has much more similarities than you would imagine. Both models are equally popular, offer similar price range, and have similar airflow delivery performance. GermGuardian gains extra 1 UV-light filtration while Levoit stands out in a much smaller/ shorter dimension.

GermGuardian AC5250PT

Add another $20-40 dollars more, you will get yourself a slightly bigger, slightly more powerful and slightly better purifying coverage air purifier. You will also gain 1 additional speed (total of 5), additional Pet Pure treatment (antimicrobial) and timer. Not bad for sure a meager top up.
GermGuardian AC4300BPTCA-Elite-3-in-1-Air-Cleaning-System-with-Pet-Pure-True-HEPA-Filter-UV-C-Sanitizer-Allergen-and-Odor-Reduction-22-inch-Air-Purifier-Great-for-households-with-Pets-0

GermGuardian AC4300BPTCA Elite

Another identical model to AC4825 that has a very similar specification, you enjoy a slightly wider purifying coverage and 1 additional antimicrobial Pet Pure treatment. Pricing is slightly higher (around $10-30 bucks more) but this model is not gaining the traction as the former.

Winix NK100

If you don't mind paying more than double the cost, you will reap the benefits of doubling the purifying zone, 200+ CADR on dust, smoke, and pollen, a dedicated Coated Deodorization (CD) Carbon Filter, Auto mode/ Sleep mode, and air quality indicator.

Final thoughts on GermGuardian AC4825

There are around 9000+ Amazon reviews on this Sanitizer air purifier and 79% of them gave it a big thumbs up! Most of the praises while directed on the filtration efficiency particularly if you smoke, have pets or simply allergic to dust. The smaller group compliments on the selling pricing while an even smaller number praises the filter price which is baffling to us as since is not cheap. 13% of the thumbs down users pointed directly on the build quality of the air purifier. Most of the complainers' unit suffer from burned circuit board that could be a serious fire hazard issue. Our test unit is fine but it is something you should be aware of if you plan to invest in this air purifier.

Verdicts and ratings

Build quality
Airflow delivery
Particle Filtration
Smoke Filtration
GermGuardian AC4825 3-in-1

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