Germ Guardian (brand store)black $99
Shippingabout 3–7 days
Returns–
Germ Guardian AC4825
Rank 4 of 5 robots for small rooms in our ranking, tested by .in our ranking, tested by
Score 6.0 out of 10
Lab tests, 60% of the score: no lab has tested it.
Owners’ ratings, 25%: none yet at the stores that ship to the United States, so this part is left out and the others count for more.
Features, 15%: 6.0, 53 of the 88 points for the facts the maker states.
Price does not count, so a discount never lifts a model. Only robots a lab has tested are ranked.
The highest score today is 8.4.
Is the Germ Guardian AC4825 right for your home? Find out in 7 questions →
Before you buy, compare it with 2 recommended alternatives
Beside it, two models on sale today that come closest to it on score and price, with the same kind of station where we have them.
Green is the best of these 3, also when they share the lead.
| This model Germ Guardian AC4825 | Much better, not pricier Levoit Core Mini-P Best on 2 facts | Higher score, 180% pricier Levoit Sprout | |
|---|---|---|---|
| Price and ranking | |||
| Lowest price | $99Germ Guardian (brand store) | $43Levoit (brand store) best | $279Levoit (brand store) |
| Score | best | ||
| Rank | rank 4 of 5 for small rooms | rank 1 of 5 for small rooms | rank 2 of 5 for small rooms |
| Customer rating | – | – | – |
| Station | |||
| Room size same on all | small rooms | small rooms | small rooms |
| Size, noise and age | |||
| On the market since | August 2024 | July 2023 | January 2025 |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
Prices per store
On October 15, 2026 the lowest price for the Germ Guardian AC4825 is $99 at Germ Guardian (brand store), shipping to the United States included. In our ranking it is rank 4 of 5 for small rooms, with a score of 6.0 out of 10.
All prices include shipping to the United States. Sales tax is added at checkout. We may earn a commission when you buy through these links. It never changes our ranking.
Germ Guardian (brand store)black Germ Guardian (brand store)white $99
Shippingabout 3–7 days
Returns–
Price history
Lowest price per day Tap a store to hide or show its line.
Lowest since Oct 14$99
Highest since Oct 14$99
Price drops since Oct 140no drop seen yet
Germ Guardian AC4825 specifications
The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.
Germ Guardian · on the market since August 2024
Clean air delivery rate (CADR)99 cfm
Room size we compare on151 ft²
Noise at the lowest speed40 dB
Filter life6 months
Power at the highest speed30 W
Running cost: Filters: about $72 a year at today’s prices.
Consumables: The filter lasts about 6 months.
Cleaning performance 7 facts
- Clean air delivery rate (CADR)
How much clean air the purifier delivers an hour, measured with smoke, dust and pollen. A higher figure cleans a bigger room or the same room faster.
- 99 cfm (168 m³/h)
- CADR measured to
The test the CADR comes from. AHAM AC-1 and the DOE test are independent and comparable. A maker's own test is not.
- AHAM AC-1 (US standard)
- CADR for smoke
The CADR measured with tobacco smoke, the finest of the three test particles. It is the figure to read for wildfire smoke.
- 99 cfm (168 m³/h)
- CADR for dust
The CADR measured with dust.
- 116 cfm (197 m³/h)
- CADR for pollen
The CADR measured with pollen.
- 129 cfm (219 m³/h)
- CADR for fine particles (PM2.5)
The CADR measured for particles under 2.5 microns.
- 111 cfm (189 m³/h)
- Room size we compare on
The room size where the purifier changes the air 4.8 times an hour under a 2.5 m ceiling, worked out from its CADR. We use it so every model is compared on the same rule.
- 151 ft² (14 m²)
Filter 2 facts
- HEPA filter class
How fine the filter is. True HEPA and H13 catch at least 99.97% of particles at 0.3 microns. HEPA-type is a weaker claim with no test behind it.
- True HEPA
- Activated carbon filter
A filter of activated carbon that takes out smells and some gases. It does not catch particles.
- yes
Running costs 1 fact
- Filter life
How long the maker says a filter lasts, in months of normal use. A filter that is spent cleans less.
- 6 months
Noise and power 3 facts
- Noise at the lowest speed
The sound level at the lowest speed, as the maker measures it.
- 40 dB
- Noise at the highest speed
The sound level at the highest speed, as the maker measures it.
- 55 dB
- Power at the highest speed
The power the purifier draws at its highest speed.
- 30 W
Air quality sensing 1 fact
- Particle sensor
- None
Smart features and warranty 1 fact
- App control
- None
Extras 2 facts
- Ioniser
An ioniser charges particles so they settle. Some also make a little ozone, which is why a switch to turn it off matters.
- None
- CARB certified
Certified by the California Air Resources Board as making little ozone.
- yes
Warranty and certification 2 facts
- AHAM Verifide certified
The CADR is verified by AHAM, the US trade body that runs the test.
- yes
- Warranty
The warranty the maker gives in the United States.
- 3 years
Sources: ahamdir.com · guardiantechnologies.com · ww2.arb.ca.gov
Our score
Confidence: medium. One lab and fewer than 300 owners’ ratings. The highest score today is 8.4.
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Lab tests 60%–
Left out, so the other parts count for more.
-
Owners’ ratings 25%–
Owners’ ratings, 25%: none yet at the stores that ship to the United States, so this part is left out and the others count for more.
-
Features 15%6.0
53 of 88 points for the facts the maker states.
- Price never countsA sale can’t lift a model. Today’s lowest price sits beside the score, checked every morning.
- No test, no rankOnly robots a lab has tested are ranked. The rest get a provisional score.
- Reviewers beside, not insideReviewers’ picks are shown next to the score and do not count in it.
Frequently asked questions about the Germ Guardian AC4825
What size of room is the Germ Guardian AC4825 for?
The Germ Guardian AC4825 is sized for a room of about 151 ft², the room size we compare it on. Its clean air delivery rate (CADR) is 99 cfm, measured to AHAM AC-1 (US standard).
How often does the Germ Guardian AC4825 need a new filter?
The maker gives the filter a life of 6 months.
How loud is the Germ Guardian AC4825?
The maker states 40 dB at the lowest speed and 55 dB at the highest.
Does the Germ Guardian AC4825 make ozone?
It is CARB certified, which means it stays under California’s limit of 50 parts per billion of ozone.
Is the Germ Guardian AC4825 good for wildfire smoke?
Its CADR for smoke is 99 cfm. A higher number clears smoke from a room faster, so compare it with the size of your room.
The maker
Germ Guardian
- Headquarters: United States
- Owned by Lasko Products, LLC
Germ Guardian is sold by Guardian Technologies, which gives an address in Euclid, Ohio. The company's site lists GermGuardian and PureGuardian air purifiers, humidifiers and HEPA filters. Guardian Technologies describes itself as part of the Lasko family of brands, and its site footer names Lasko Products, LLC.
