Last updated on May 15th, 2022

Germ Guardian was established in 2002 and now it’s rivaling Levoit, Blueair, Coway, Honeywell and Winix in portable True HEPA air purifiers category under brand GermGuardian on the US market and worldwide. The company also makes humidifiers, sanitizers, fans (heaters & cooling) and oils under brand names of PureGuardian and PureGuardian Spa. In January 2021 Germ guardian was acquired by Lasko Products, LLC.

Let’s review most popular Germ Guardian portable True HEPA air purifiers available on the market today in 2022.

GermGuardian AC4825: The Best Germ Guardian!

GermGuardian AC4825 air purifier review
True HEPA:
Filter Life:
UV-C Bulb Life:
CADR (CFM):
Room Coverage:
Power:
Noise Level:
6 months (Replacement Filters)
12 months (Replacement)
Pollen 125 / Dust 118 / Smoke 99
153 sq.ft.
53 Watt
~55 dB

GermGuardian AC4825 is the second most sold air purifier after Levoit Core 300 with tens of thousands of reviews. It is available in two colors: black (model number AC4825E) and white (model number AC4825W). Let’s take look at its features and reasons why it is so popular.

The first reason for the AC4825 popularity is the price. The air purifier priced under $100 (white version adds a few more dollars) and Germ guardian offers 3 year limited warranty for the unit. It’s a great deal for anyone who interested in getting their first quite durable air purifier, but doesn’t want to spend a lot of money.

Despite low price, the GermGuardian AC4825 offers a great value for money. Judge for yourself: the air purifier employs 4-stage air filtration process that includes:

  1. True HEPA filter that capture 99.97% of dust and allergens.
  2. Activated Carbon filter for odor reduction.
  3. UV-C light for reducing germs, bacteria, mold spores and viruses in air.
  4. Titanium dioxide (TIO2) component to increase anti-bacteria capabilities and help decompose environmental pollutants.

All in all, this is one of the most buffed air purifiers you can get for the price. The only thing it lacks by modern standards is pre-filter which is used to add additional layer of air filtration (it captures large particles of dust, hair and such) and protects True HEPA filter from wearing out too early. But considering the price, the GermGuardian AC4825 is still a great deal.

As for the room coverage, the AC4825  can circulate the air 4.8 times per hour in 153 sq. ft. room. You can calculate air changes for your room using AHAM-verified CADR ratings for smoke, dust or pollen.

Regarding noise pollution and power consumption, the Germ Guardian AC4825 doesn’t shoot for the sky. At a maximum (third) speed the air purifier produces ~55 decibels of noise and consumes 53 watts of energy. It’s approximately 60 dollars per year if used 24/7 at a maximum speed. Use our calculator to estimate energy consumption for the air purifier. Plus $50 on replacement filters each year, totaling ~110 bucks. In reality you won’t be running it at speed three 24 hours per day and maintenance costs will be under $100.

The air purifier is also equipped with 2 indicators that will let you know when to change filters or UV-C bulb. The first one require replacement every 6 months or so, and the lamp can last up to 12 months depending on usage.

All in all, the GermGuardian AC4825 is popular air purifier for a reason. If you looking for an air cleaner for your small bedroom, living room, bathroom or kitchen, this is a good pick.

GermGuardian AC5900WCA: High CADR

GermGuardian AC5900WCA air purifier review
True HEPA:
Filter Life:
UV-C Bulb Life:
CADR (CFM):
Room Coverage:
Power:
Noise Level:
6 months (Replacement Filters)
12 months (Replacement)
Dust 239 / Pollen 237 / Smoke 235
365 sq.ft.
86 Watt
~62 dB

Shop GermGuardian AC5900WCA at a discount

GermGuardian AC5900WCA air purifier varies not only by design from the previously reviewed AC4825, but it has greatly improved air cleaning capabilities and got several powerful function. Let’s review them all.

The AC5900WCA received new fan motor and now it’s capable of cleaning 365 sq. ft. room in just 12 minutes or 881 sq. ft. space in 30 minutes. The new design also allowed for CADR ratings to be more balanced, so whether it’s pollen, dust or smoke, the Germ Guardian AC5900WCA can filter it our at the same rate.

The UV-C bulb remained the same and it releases 0.001 parts per million (PPM) of ozone. It’s way down below the minimum requirements, but the lamp can be turned off in a case you still don’t feel safe about ozone emission.

The GermGuardian AC5900WCA has also got a programmable timer (allows to set up operations in 1, 2, 4 or 8 hours).

Due to the increased power, electricity consumption at a maximum speed rose to 86 Watts per hour, although that is still won’t affect yearly costs that much. The real affect on increased maintenance costs have new larger (1.75″ x 13.5″ x 15 vs 1.29″ x 4.76″ x 15.77″) True HEPA and Carbon filters: replacement for them will cost you over $100 per year.

As a result, the GermGuardian AC5900WCA stands as a powerful, reasonably priced air cleaner for medium and large rooms. On the downside, the cost will greatly increase over time due to expensive filters. On third year of usage the price for replacement filters will be over $300 and overall price for the air purifier plus replacement filters will come close to the Airdog‘s X5 that uses washable filter.

GermGuardian AC5350B / AC5350W: Improved Performance

GermGuardian AC5350B Air purifier review
True HEPA:
Filter Life:
UV-C Bulb Life:
CADR (CFM):
Room Coverage:
Power:
Noise Level:
6 months (Replacement Filters)
12 months (Replacement)
Pollen 127 / Dust 114 / Smoke 108
167 sq.ft.
~50 Watt
60 dB

Shop GermGuardian AC5350B / AC5350W at a discount

GermGuardian AC5350 available in two colors: black (AC5350BCA) and white (AC5350W). The specifications are somewhat similar to the Germ Guardian AC4825, but the price has increased substantially. You may ask then, is the AC5350 worth the money?

TL; DR: no if you don’t have spare money. Yes if:

  • The GermGuardian AC5350 is sold at a discount. Sometimes it’s 30-40$ off.
  • You enjoy the design. This one has the most unique designs I’ve ever seen! Compared to the standard tower air purifiers, this one has a unique look. Dyson also manufactures their air cleaner with unique design but they have higher price tag.
  • You want to have more control over air filtration process with 5 speeds, the lowest is a great one for sleeping. Although it’s impossible to turn off the lights completely.
  • You need a programmable timer (1, 2, 4 or 8 hours).

Maintenance costs for the GermGuardian AC5350B or AC5350C has slightly increased due to the higher replacement filter costs (although the filter itself is larger too, 1.75″ x 4.75″ x 19.25″ vs 1.29″ x 4.76″ x 15.77″) compared to the AC4825.

GermGuardian AC5250PT for Pet Odors

GermGuardian AC5250PT air purifier review
True HEPA:
Filter Life:
UV-C Bulb Life:
CADR (CFM):
Room Coverage:
Power:
Noise Level:
6 months (Replacement Filters)
12 months (Replacement)
Pollen 138 / Dust 132 / Smoke 122
189 sq.ft.
~55 Watt
~62 dB

Shop GermGuardian AC5250PT at a discount

GermGuardian AC5250PT air purifier was designed with reducing pet odor in mind. Germ guardian has installed an additional antimicrobial pre-filter in additional to the Carbon and True HEPA filters. The AC5250PT also got CADR ratings slightly improved vs the AC4825, but the difference is negligible.

If you have pets in your house, then Germ Guardian AC5250PT is a way to go. Even more so if you can get this air purifier at a discount.

GermGuardian AC9400W with Auto mode

GermGuardian AC9400W air purifier review
True HEPA:
Filter Life:
CADR (CFM):
Room Coverage:
Power:
Noise Level:
6 months (Replacement Filters)
Pollen 275 / Dust 263 / Smoke 259
402 sq.ft.
48 Watt
60 dB

Shop GermGuardian AC9400W at a discount

GermGuardian AC9400W is the only air purifier designed for rooms over 400 sq. ft. in size. Compared to the other reviewed here Germ Guardian air purifiers, the AC9400W features an auto mode and 360-degree air intake. It also features night mode when air purifiers works silently and lights are completely turned off.

Another interesting function of the GermGuardian AC9400W is a display with Air Quality Index that provides detailed information on particulate matter inside a house.

The machine has also a built-in ionizer to help True HEPA filter capture allergens and freshen the air. On the other hand, it lacks UV-C light.

The AC9400W has a price tag of about $400, which is quite high if you compare it to the other Germ Guardian air purifiers. But it is to be expected with the increased coverage and additional functions. If you need an air cleaner that can automatically adjust its speed and you’re planning to run the unit at night, GermGuardian AC9400W is a good pick.

GermGuardian AC4100: Tabletop air purifier

GermGuardian AC4100 air purifier review
True HEPA:
Filter Life:
UV-C Bulb Life:
CADR (CFM):
Room Coverage:
Power:
Noise Level:
6 months (Replacement Filters)
12 months (Replacement)
Pollen 76 / Dust 66 / Smoke 50
78 sq.ft.
40 Watt
55 dB

GermGuardian AC4100 is portable air purifier that available in grey and white (model number 4175W) colors. It’s priced way below $100 and can be used on a desktop. It is able to purify only small area of space.

What makes the Germ Guardian AC4100 to stand-out among other personal / desktop air purifiers is that it has both True HEPA filter and UV-C Light, coupled with higher than average CADR ratings for dust and pollen. If you suffer from allergies in a small office or room, this can be a truly game changer for you.

Other Germ Guardian Air Purifiers Specs Comparison

Model CADR (CFM) Coverage Power Noise Price
AC4900
  • Pollen: 112
  • Dust: 106
  • Smoke: 96
150 sq. ft. ~55W ~55dB Discount
CDAP5500BCA
  • Pollen: 139
  • Dust: 118
  • Smoke: 110
171 sq. ft. ~50W 60dB Discount
AC5300B
  • Pollen: 127
  • Dust: 114
  • Smoke: 108
167 sq. ft. ~50W 60dB Discount
AC5000E
  • Pollen: 138
  • Dust: 132
  • Smoke: 122
189 sq. ft. 54W ~60dB Discount
CDAP4500BCA
  • Pollen: 102
  • Dust: 99
  • Smoke: 96
148 sq. ft. 52W 50dB Discount
AC4300BPTCA
  • Pollen: 116
  • Dust: 107
  • Smoke: 99
153 sq. ft. 53W 55dB Discount
AP2200CA
  • Pollen: 159
  • Dust: 135
  • Smoke: 99
153 sq. ft. 55W 55dB Discount
AC9200WCA
  • Pollen: 265
  • Dust: 216
  • Smoke: 216
335 sq. ft. 85W 50dB Discount
AC5900WCA
  • Pollen: 237
  • Dust: 239
  • Smoke: 235
365 sq. ft. 83W 55dB Discount

Disontinued: GermGuardian AC4825DLX.

I hope this review was helpful for you to decide which Germ guardian air purifier suits you best.