GermGuardian AC4825 is a simple air purifier that is extremely easy to use. There are no advanced features on the control panel, and because of that, this air purifier is ideal for people that love fresh air but don’t want to be bothered with too many options. AC4825 only has three speeds, but it is a 4 in 1 air purifier. 4 in 1 means that it uses four different cleaning air methods.
Table of Contents
- 1 GermGuardian AC4825 Specifications
- 2 Design
- 3 Features
- 4 CADR Ratings
- 5 Filters
- 6 How to replace GermGuardian AC4825 filter?
- 7 UV-C Bulb
- 8 Noise
- 9 Performance Tests
- 10 Operating Costs
- 11 Pros and Cons
- 12 Summary
We must say that even though it doesn’t have advanced features, this air purifier is one of the most popular air purifiers on the market. Without a doubt, this air purifier is one of the best sellers from the Guardian Technologies company.
GermGuardian AC4825 is built for a 167 sq. ft. room and uses UV-C light to kill germs and mold spores.
UV-C light is proven to be extremely effective at killing germs, mold spores, and even some viruses. This advanced technology is part of the air purifier and can be turned on or off at any time.
UV-C light is not the only technology that cleans the air in the GermGuardian air purifier; this popular air purifier also uses a pre-filter, HEPA filter, and activated carbon filter.
GermGuardian AC4825 Specifications
Below is a complete list of important specifications and features included on the GermGuardian AC4825 Air Purifier:
|Dimensions||9 x 5.5 x 22 inches|
|Filters||Pre/Charcoal Filter and True HEPA Filter|
|Filter Longevity||up to 6 months|
|Coverage||167 sq. ft.|
By the looks, we can say that AC4825 uses tower shape design. This tower-like design is proven to be useful because it can be placed in tight spots. Many other brands use tower shape for their devices, and we can even say that this tower-like design can be put in the special category when talking about air purifiers.
The black color is the brand of this model, and almost the whole device is in black. Only the top is in silver color with a blue line that emits light. On top is the control panel. However, there are not many options to use, the UV-C light button and fan speed knob. By turning the power knob, you also control speed and turn the air purifier on or off. UV-C light button is also a filter replacement button that is used to reset the filter replacement period.
On the back is an air inlet and on the front is an air outlet, so keep that in mind when you want fresh air delivered directly into your face. On the back of the air purifier is also a hole that is used for transport. You can transport it with one hand. The overall design is nothing special.
As already mentioned, the device is turned on with a power knob. By moving the knob in the clockwise direction, you can also control fan speed. The device has three speeds; low, medium, and high.
A button with UV letters is used to turn the UV-C bulb on. This button is also used to reset filters and UV-C light. We will talk more about the reset function later in the review.
In the end, when the air purifier is done with the job, you can turn it off by moving the power knob back into a default position.
Size and Dimensions
GermGuardian AC4825 is tall (9 x 5.5 x 22 inches) but small with only 8.55lb in weight. It also has a handle on the back for easier transport. You won’t have any problems moving it from one location to another.
Accessories and Parts
When you buy GermGuardian AC4825 in the package, you will get one air purifier, one true HEPA filter, one pre-filter combination with charcoal filter, a UV-C bulb, and a user manual.
GermGuardian AC4825 is a certified device that guarantees quality. It has EPA, CARB, Energy Star, and AHAM certificates. In other words, you can’t go wrong with this device if you only look at the certificates.
GermGuardian AC4825 is free from ozone, and that is true. Proof of that is the CARB certificate. Some air purifiers produce ozone but not AC4825.
Silent at Work
Silence is essential for the bedroom because loud noise can bother your sleep. Put the air purifier on the first speed, and you can sleep like a baby.
This device is built for up to 167 sq. ft. rooms. In the recommended room size, this device will provide the best performance. However, if you need a stronger device, you can take a look at the Levoit Core 300 model.
The UV-C bulb is turned off by default, if you are suspicious about UV-C light function, you never have to turn it on.
A three-year warranty is more than generous from Germ Guardian. However, you will need to register your device on the Germ Guardian website to use the full three-year warranty.
CADR ratings are the way we can see the difference between the filtration power among air purifiers. Each rating is important, and you can pick an air purifier that best fits your needs.
For example, if you have smoke or odor trouble at home, then look at CADR for a smoke. Check out the table below with all the CADR ratings of GermGuardian AC4825.
The filter is the most important part of every air purifier. All airborne pollution, dust, pollen, pet dander, hair, and even mold spores are removed with a filter.
The filter is delicate and needs to stay dry for maximum performance. Because of that, never use an air purifier in areas with high moisture. The filter is not reusable, which means you should never wash it or clean it. These actions may damage the filter, and you can have even more pollution at home than before.
Essential oils on the filter are big no. Oils can destroy filters and even damage the air purifier. If used properly, the filter needs to be replaced every six months.
True HEPA Filter
True HEPA filter destroys up to 99.97% of harmful germs, dust, pollen, pet dander, mold spores, and other allergens as small as 0.3 microns from the air.
We keep the True HEPA filter at top performance by using pre-filter and regular filter replacements.
Pre-filter + Charcoal
A combination of pre-filter and charcoal is not the happiest combination because this means that there is not much carbon to remove all the bad smells in the room. However, charcoal pre-filter will still be useful at removing odors at a decent time. It would be much better if instead of a charcoal filter, a carbon pellet is used.
Nevertheless, pre-filter will remove larger particles, dust, and some allergens. The charcoal filter prevents excessive accumulation of odor but also reduces the growth of bacteria, germs, and mold.
How to replace GermGuardian AC4825 filter?
Turn off the air purifier, make sure the power cable is also unplug. After that, open the rear cover by pressing the lock and release button.
Remove the old filter from the air purifier.
Put the new filter into the unit. Check the arrow on the filter to place it correctly inside.
Put the cover back and seal it.
Lastly, press and hold the UV Control Button for 5 seconds to reset the Filter Change Indicator.
UV-C light is one of the best ways to kill dangerous microorganisms. Many manufacturers started to use UV-C light in their air purifiers to provide even greater performance.
UV-C light is safe to use in certified air purifiers.
The GermGuardian AC4825 UV-C bulb position is not the best. It would be much better if it is placed somewhere in the middle of the device and not on the top. UV-C light technology works with Titanium Dioxide. Titanium Dioxide is activated by UV-C light and, in combination, kills germs but also removes odor molecules, smoke, cooking odor, and even pet odors.
When UV-C light is on, you will see the blue light on the front panel. UV-C light is safely contained inside the air purifier, and using it is perfectly safe.
How to replace UV-C bulbs?
Again remove the back cover, but also make sure the device is unplugged. Immediately after, remove the filter from the air purifier.
Remove UV-C metal shield with Phillips screwdriver.
Use the clean cloth on the UV-C bulb and remove it out from the unit.
The UV-C Bulb is reinstalled by pushing it horizontally back into the holes at the unit’s top.
Press and hold the UV Control Button for 5 seconds to reset the UV Bulb Change Indicator.
We have tested this device in various situations and different fan speeds. What I like about AC4825 is the difference in noise at a different speed. Some models have third speed extremely loud, but not GermGuardian. Still, in general, noise could be a little bit lower.
On the first speed device makes 46.7 dBA, on second speed, 50.5 dBA, and on third speed, this air purifier makes only 54.2 dBA. It is clear that this device needs sleep mode, which could reduce noise at a lower speed even more. As always, we used a measuring tool that uses the dBa scale, and our results may be different from the official ones. Check out the table below for more details about the noise.
|Speed 1||46.7 dBA|
|Speed 2||50.5 dBA|
|Speed 3||54.2 dBA|
We tested this air purifier in different rooms. Only the most significant tests will be included in this review. Overall, this device did a good job. We tested it with UV-C light and without it.
Our pollution measuring tool did not find a significant difference in these tests. We must say that our tests are done in real-life situations, and we did not do any tests in the laboratory.
320 sq. ft. Room
In this large room that is almost two times larger than the recommended one, our test device did a good job with excellent results. In only one hour of work, AQI dropped from 80 to 8 and improved air quality by 90%.
|#||Starting Baseline||After 60min|
320 sq. ft. Room With UV-C Turned On
In the same room size, but now with UV-C light on, results were not significantly different. AQI drops from 85 to 8, which is 91%. We can say that UV-C light gives an additional 1% boost, which is not that much after all.
|#||Starting Baseline||After 60min|
194 sq. ft. Room
This room is almost the perfect size but still a little bit larger than the recommended one. Again there is not much difference between the tests. In 60 minutes, AC4825 managed to drop AQI from 85 to 7, which is 92%. Again an excellent job.
|#||Starting Baseline||After 60min|
AC4825 is powered by a 50W engine that pulls 55W when at full speed and with the UV-C light turned on. These numbers are not high, and you won’t see any significant charges on your electricity bill. In whole month work, 24h every day, this device will cost you only 3.8$ if we consider that the US’s electricity price is 0.12$ per kWh.
When on standby, the device will not use any power. With UV-C light energy consumption is higher but not significant. A much higher operating cost is filter replacement, which needs to be replaced every six months. GermGuardian is an energy star certified device but if 55W is too much for you, then take a look at Blueair 411, which uses only 10W of power.
|Speed||Power Usage (W)|
|Speed 1||30.8W – 35.1W*|
|Speed 2||34.8W – 38.6W*|
|Speed 3||39.0W – 43.1W*|
* This was power usage with UV-C bulb turned on.
Pros and Cons
To revise, here are advantages and disadvantages of AC4825:
GermGuardian AC4825 is an old-style air purifier with great popularity on the market and excellent performance. It is unbelievable that this device comes with a True HEPA filter for such a low price.
GermGuardian AC4825 has proven itself in our test, and there is a real reason why this device is so popular on the market. And in the end, all we can say is buy it; you won’t regret it.
October 8, 2020 – We have completely updated the GermGuardian AC4825 review with all new important things: noise tests, filter tests, performance tests, operating costs, filter replacement guide etc.