GermGuardian AC4175W Air Purifier: Trusted Review & Specs

We’re here with another low-cost GermGuardian air purifier that’s supposed to be the newer model of the old GermGuardian AC4100 and GermGuardian AC4150 in the past. To my surprise, the GermGuardian AC4175 with the same air filter, does better performance for its price, but not so good when it comes to features and annual cost. Let’s check it out in our GermGuardian AC4175 Review.

GermGuardian AC4175 ranks C- in our air purifier ranking list

Updated: The GermGuardian AC4200 is released now, with new design and 100% ozone-free air filtration system.

In Breathe Quality, we have reviewed all air purifiers under these sections. Also, we guarantee that:

  • We do give honest reviews (both pros and cons) so anyone will guarantee to have the wisest choices.
  • We do not (and never) exaggerate one product just to let you click the links and buy that product blindly.


germguardian ac4175 review

  • Filter E got better
  • Decent UV-C light filter

  • Quite noisy at highest setting
  • Lacks of Smart features
  • Annual cost is high

With GermGuardian AC4175, the Guardian Technologies did some stealth revision to its old filter E, as we found an overall better performance than the last time we did with GermGuardian AC4100. That makes the GermGuardian AC4175 a promising buy for less than $100, but you should check the whole GermGuardian AC4175 Review to know if you should buy it.

Other GermGuardian’s Air Purifier Reviews:

GermGuardian AC4175 Price

For years Guardian Technologies made fairly conventional air purifiers that, while solid with its UV-C light and HEPA filters combination, did not rank well in our ranking list. Some GermGuardian air purifiers are still recommended, but not your best choice anymore.

The GermGuardian AC4100 was first recommended by us, but its performance falls far behind the competition at the moment. However, with the GermGuardian AC4175, we’re pretty sure that the filter E inside it got a stealth revision. It is now a True HEPA filter, that does decent for the price and it can last for up to 8 months.

So, perhaps I will edit the reviews for both the AC4100 and AC4150 as soon as we can. But here we are for the newest GermGuardian AC4175, which costs around $69. It is a little bit more expensive than the original AC4100, so we wonder if it’s worth the extra dollars.

The GermGuardian AC4200 is still a better recommendation from Breathe Quality, and we will point you to either the Levoit LV-H128 or Airthereal ADH50B for an overall better air purifier.

Top GermGuardian AC4175 deals right now

GermGuardian AC4175 4-in-1 Air Purifier with True HEPA Filter, UV-C Sanitizer, and Odor Reduction.

Stealth Revision to Filter E makes it a decent air purifier, with easy-to-use settings and CARB Compliant.

Related post: Best air purifier 2022.

GermGuardian AC4175 Design and Size

It’s quite easy to lose track of which GermGuardian air purifier you’re looking into, as the company has released a lot. Yes, a lot. The names it gives to their own air purifiers make things worse, as it’s just like random number.

The GermGuardian AC4175 somehow shares the same design as its predecessors, the GermGuardian AC4100 and GermGuardian AC4150. It’s simple, compact and overall a nice accessory to your desk. At 10 inches, it could be a bit smaller than the AC4100 in my memory. It would be your companion anywhere.

It features a different color option than any original GermGuardian air purifiers with classic black color. Seems like Guardian Technologies is featuring the white color for all of its products at the moment.

This GermGuardian AC4175 has its own philosophy of airflow, with the back-to-front air flow system concept like its bigger brothers. This could be a good way to direct the clean air flow to its users, but it’s quite difficult to place it properly.

It is still one of the most compact air purifiers on the market, at only 5 lbs.

Related post: Best air purifiers for bedroom.

GermGuardian AC4175 Filters

The GermGuardian AC4175 uses the same 3-in-1 air cleaning system as its predecessors. However, with the improvement of a TiO2 treatment into the UV-C light bulb, it is called 4-in-1 at the moment.

  1. Activated Carbon Filter – The normal carbon filter attacks smoke, cooking and pets odors along with harmful VOC’s emitted by common household products. A pack of 4 carbon filter can last for 1 year.
  2. True HEPA filter – With the new filter E, the GermGuardian AC4175 can deal with 99.97% of dust and allergens as small as .3 microns in size.
  3. UV-C Light – The unique 2W bulb with UV-C light to fight germs, kills airborne bacteria, viruses and mold spores. Works with titanium dioxide to reduce VOCs.

The filter E is now a new True HEPA filter with much better performance, and you can see in the below test. It does much, much better than the old GermGuardian AC4100 did at 100 square feet, in 1 hour. However, the air purifier is still behind the performance of the TCL Breeva A1, Envion Therapure EA150 or Honeywell HPA020.

germguardian ac4175 review

The filter E is here for the whole 4100 series of GermGuardian, and it is suggested to be replaced after 6 to 8 months.

Related post: Best air purifiers for allergies.

GermGuardian AC4175 Room Coverage

Another GermGuardian air purifier is verified by the Association of Home Appliance Manufacturers (AHAM), and gains one point in our performance ranking. The GermGuardian AC4175 is expected to run in 66 square feet.

The ACH of GermGuardian AC4175 is 5X. That is the common air changes per hour for an AHAM-certified air purifier.

The CADR of GermGuardian AC4175 is 50 Dust/ 42 Smoke/ 50 pollen (cfm). So to say, I really expect the GermGuardian AC4100 and GermGuardian AC4150 to perform much better in our nearest possible tests, as they both have slightly more powerful fan than the GermGuardian AC4175.

Related post: Best large room air purifiers.

GermGuardian AC4175 Sound

The GermGuardian AC4175 is supposed to run as quiet as possible, but it is still a GermGuardian air purifier with a bit higher noise level than normal. The lowest noise level is measured at 42 decibels (db), which is just like the normal library noise level, but it is still far from the best.

On highest speed, the noise level is 50 decibels, which is still okay for an air purifier with such weak fan power.

Related post: Best air purifiers for baby.

GermGuardian AC4175 Power Consumption

To be one of the best air purifiers, one device must strictly pass our Breathe Quality test after a long time use. Also, one of the most asked questions in Breathe Quality is: “Do air purifiers use a lot of energy?”. We can all agree that power consumption is one important criteria to review if this air purifier is worth your money or not.

Using an only 2 watts UV-C bulb, GermGuardian AC4175 reaches a power consumption of 40 watts. This air purifier, unlike most of its brothers, isn’t an Energy Star air purifier.

For using a GermGuardian AC4175 8 hours per day, it would cost you up to $15 per year.

Related post: Best air purifiers for pets.

GermGuardian AC4175 Additional Features

Being the newer model of the AC4100 doesn’t mean the GermGuardian AC4175 should have more features. It is also the weakest link of the GermGuardian AC4175, as it only has a LED indicator for filter replacement.

In comparison, it loses to almost any other air purifiers you can find in this price range.

Related posts:

1, Best air purifiers for smoke.

2, Best air purifiers for dust.

3, Best air purifiers for mold.

GermGuardian AC4175 Customer Service

There is not much to say about the brilliant support from Guardian Technologies’s customer service. The American brand is providing a very active support for anyone contacting them. They also put the Instruction Manuals online to help you solve the common questions by yourself. But if you can’t find a solution, just contact the customer service via phone at 866-603-5900 or via email at Just like any other brands, they will be available for you from Monday to Friday.

They have occasional Free Shipping policy, as well as a great discount on all products (most popular 10% to 20%). Whenever you find their air purifiers not as great as you previously thought, you can return them within 30 days of your original receipt of the order. And don’t worry about the warranty policy of Guardian Technologies, as they warrant their products to be free of defects in materials or workmanship. You can register for a warranty in up to 3 years for the small devices, and up to 5 years for others.

However, for the GermGuardian AC4150 and GermGuardian AC4100, you will only have an 1-year warranty.

Top GermGuardian AC4175 deals right now

GermGuardian AC4175 4-in-1 Air Purifier with True HEPA Filter, UV-C Sanitizer, and Odor Reduction.

Stealth Revision to Filter E makes it a decent air purifier, with easy-to-use settings and CARB Compliant.

Our verdict

Guess that the fitler E is revamped completely, and it improves the performance of the GermGuardian AC4175 drastically. However, the air purifier still remains many of GermGuardian’s problems, most notably the high noise level on lowest setting, high energy cost for its fan power, and its lacking of additional features.

  • Performance
  • Features
  • Annual Cost
  • Design
  • Price


An improvement in filter E, but still remains many other problems.

GermGuardian AC4175 Air Purifier: Trusted Review in 2022
GermGuardian AC4175W Air Purifier: Trusted Review & Specs

GermGuardian AC4175 Reviews and Specs (Air Purifier Trusted Reviews in 2022). ✓ Cleaning Power: HEPA + UV-C filter ✓ Size: 5 lbs ✓ Value: 5/5 ✓Certified Review.

Product Brand: Guardian Technologies

Product Currency: USD

Product Price: 69

Product In-Stock: InStock

Editor's Rating: