In today’s article, I will compare the strengths of the GermGuardian AC4825 and Medify MA-15 air purifiers.
The GermGuardian AC4825 is one of the most popular air purifiers on the market. It has a CADR of 99 CFM (168 m³/h), making it suitable for rooms up to 167 sq. ft. (15.5 m²).
On the other hand, the Medify MA-15 is a more compact air purifier with a CADR of 78 CFM (132 m³/h) and a room coverage of 138 sq. ft. (12.8 m²). Both air purifiers are capable of cleaning the air 4.8 times per hour within their recommended room sizes.
Neither model offers advanced features or smart app compatibility, but both are highly reliable and trusted by many customers.
While both devices use three-stage filtration technology, the Medify MA-15 stands out with its dual filter design.
Our Verdict
If you think declaring a winner in this comparison is an easy task, I’m afraid you’re mistaken.
These two air purifiers produce very similar test results. However, the Medify MA-15 stood out as a much better performer in our smoke test, a quieter air purifier at lower speeds, and a much more energy-efficient option.
For these reasons, I would choose the Medify MA-15 as the better buy.
If you have any questions about these two air purifiers, feel free to leave a comment below!
Specs: Medify MA-15 Vs GermGuardian AC4825
| Product Image |  |  |
| Manufacturer | Medify | Guardian Technologies |
| Model | MA-15 | AC4825(E) |
| Dimensions (inches / cm) | 7.5 x 7.5 x 12.2 inches (19.1 x 19.1 x 31 cm) | 9 x 5.5 x 22 inches (22.9 x 14 x 55.9 cm) |
| Weight (pounds / kg) | 5.89 lb (2.67 kg) | 8.5 lb (3.86 kg) |
| Clean Air Delivery Rate (CADR) | 78 CFM (132 m³/h) | 99 CFM (168 m³/h) |
| Coverage (4.8 ACH)
Room Coverage Explanation: ACH is a measurement used in indoor air quality management to indicate how many times the air within a defined space is changed/moved through the filter media.
For more details, visit our ACH calculator tool. | 138 sq. ft. (12.8 m²) | 167 sq. ft. (15.5 m²) |
| Performance Ratings Performance Ratings Score Summary: 8.4 - Average Score (71 products) 9.8 - Best Score (2 products) 2.5 - Worst Score (2 products) We use the Temtop LKC-1000S laser particle meter to test the particle removal efficiency of every air purifier. It measures PM2.5 (µg/m3), PM10 (µg/m3), Particles (per/L), and HCHO (mg/m3) in the air, and also calculates the AQI. You can read more about our testing methodology here. | ||
| Filtration Technology | Pre-filter, True HEPA Filter, and Activated Carbon Filter | Pre/Charcoal Filter Combo, True HEPA Filter, and UV-C Light |
| Filter Replacement Indicator | Yes | Yes |
| Filter Life | 3-4 months | up to 6 months (HEPA) |
| Power Consumption
Power Usage Summary: Our extensive testing of 71 air purifiers revealed the following power consumption insights:
Check out our power consumption calculator tool. | 25W | 55W |
| Operating Costs Ratings Operating Costs Ratings Score Summary: 9 - Average Score (71 products) 10 - Best Score (2 products) 1.7 - Worst Score (1 products) We measure the power usage at all speeds using an energy meter, after which we calculate how much it would cost to use the device at a particular fan speed for one month. For reference, we use an energy price of $0.12 per kWh. You can read more about our testing methodology here. | ||
| Number of Fan Speeds | 3 – Speed 1, Speed 2, and Speed 3 | 3 – Low, Medium, and High |
| Air Quality Sensor Air Quality Sensor Summary: Out of 71 air purifiers tested, only 33 have the air quality sensor. | No | No |
| Air Quality Indicator | No | No |
| Auto Mode Auto Mode Summary: Out of 71 air purifiers tested, only 34 have auto mode functionality. | No | No |
| Smart App Smart App Summary: Out of 71 air purifiers tested, only 22 have smart app functionality. | No | No |
| Voice Control Voice Control Summary: Out of 71 air purifiers tested, only 22 have voice control functionality. | No | No |
| Other Features | TimerChild LockDimmer | UV-C Light |
| Noise Level (low – high) | 41.2 – 61.1 dBA | 46.7 – 54.2 dBA |
| Noise Ratings Noise Ratings Score Summary: 9.3 - Average Score (71 products) 10 - Best Score (1 products) 8.2 - Worst Score (1 products) We use a special noise measurement tool to test the noise level of the air purifier at all speeds. We measured the noise level on the dBA scale. You can read more about our testing methodology here. | ||
| Best Suited For | Small Spaces Bedrooms | Small Spaces Mold |
| Warranty | Lifetime (conditioned) | 3-year |
| In-Depth Review | Medify MA-15 | Guardian Technologies AC4825(E) |
| Price | Check Price on Amazon | Check Price on Amazon |
Performance Test – Comparison
What’s great about this comparison is that we tested both air purifiers in two identical rooms, which is great for precise performance comparison.
Interestingly, both devices produced identical results in our tests.
In the first test, performed in a 194 sq. ft. (18 m²) room, both air purifiers achieved a 92% improvement in air quality. In the second test that we did in a much larger 320 sq. ft. (30 m²) room, they improved air quality by 90%.
Particle Removal Tests - Comparison
We placed the Medify Air MA-15 Vs GermGuardian AC4825 in two separate tests and measured their performance using the Temtop laser particle meter.
It’s worth mentioning that we didn’t use the full potential of the GermGuardian AC4825, as the UV-C light wasn’t activated during testing.
However, it’s a significant achievement for the Medify MA-15 to perform on par with the GermGuardian AC4825, especially considering it’s a much smaller air purifier with a lower CADR.
Smoke Box Test – Comparison
Despite being a much smaller device, the Medify MA-15 impressed me during our smoke test.
It removed all the smoke from the glass box in just 32 seconds, significantly faster than the more powerful GermGuardian AC4825, which took 52 seconds.
Perhaps the Medify MA-15’s dual filters contributed to its superior performance in this test.
Noise Level Test – Comparison
The noise level of any air purifier is largely determined by the number of fan speeds and the noise level at each speed. The Medify Air MA-15 and GermGuardian AC4825 feature three fan speeds and lack a sleep mode.
I was particularly impressed with how quiet the Medify Air MA-15 is at its lowest speed. It operates at a near-whisper sound level of 41.2 dBA, making it almost unnoticeable.
Noise Levels - Comparison
Comparison of noise levels at all fan speeds between the Medify Air MA-15 Vs GermGuardian AC4825 air purifiers.
In comparison, the GermGuardian AC4825 is much louder at its lowest speed, producing 54.2 dBA. This level of noise was surprising and makes the GermGuardian less suitable for bedrooms or similar quiet spaces.
However, things are totally different at maximum speeds. The GermGuardian AC4825 maintains its noise level at 54.2 dBA, while the Medify MA-15 becomes louder, producing 61.1 dBA.
| Fan Speed | GermGuardian AC4825(E) (dBA) | Medify MA-15 (dBA) |
|---|---|---|
| Speed 1 (Low) | 46.7 dBA | 41.2 dBA |
| Speed 2 (Medium) | 50.5 dBA | 47.1 dBA |
| Speed 3 (High) | 54.2 dBA | 61.1 dBA |
Overall, the Medify MA-15 is quieter on its first and second speeds, whereas the GermGuardian AC4825 is quieter at its maximum speed.
Operating Costs – Comparison
Let’s start by comparing the power consumption of these two air purifiers. The GermGuardian AC4825 features a 55W motor, with 5W dedicated to its UV-C light.
In contrast, the Medify MA-15 is equipped with a much more energy-efficient 25W motor.
Monthly Power Consumption Cost - Comparison
Comparison of monthly power consumption costs for the Medify Air MA-15 Vs GermGuardian AC4825 air purifiers at all fan speeds.
If you were to use both air purifiers 24 hours a day for a month, the GermGuardian would increase your electricity bill by approximately $3.42, while the Medify MA-15 would cost about $2.08.
However, power usage isn’t the only cost to consider. Replacement filters, which last about 3–4 months for the Medify and up to 6 months for the GermGuardian, also contribute to maintenance expenses.
| Fan Speed | GermGuardian AC4825(E) (W + $/month) | Medify MA-15 (W + $/month) |
|---|---|---|
| Standby | 0W ($0) | 0.9W ($0.08) |
| Speed 1 (Low) | 30.8W ($2.7) | 2.2W ($0.19) |
| Speed 2 (Medium) | 34.8W ($3.05) | 5.3W ($0.46) |
| Speed 3 (High) | 39W ($3.42) | 23.7W ($2.08) |
While GermGuardian replacement filters are slightly more affordable, it’s worth noting that the Medify’s dual filters and superior energy efficiency make it a more cost-effective option overall when considering total maintenance costs.
Features Overview
Sometimes, making a comparison like this one can be really demanding and tricky. The reason lies within the generation gap and, even more so, within the way they are the subject of investments. In many cases, manufacturers disregard any chance of upgrades once their product meets their customers’ expectations.
In this particular case, we have an example of GermGuardian AC4825 which was more than welcomed by many market participants, by following their needs and giving them a healthier life. Up til now its level of performance has been outstanding but also very basic. Nonetheless, with the usage of its mechanical wheel, on the upper side, you can shift between gears and connect the air purifier to a smart plug.
Following the new age technology, Medify Air MA-15 can offer some of the features that GermGuardian does not come with. One of the common features that I would like to point out, and that I like, is the Filter Reset Indicator. By now, I am sure you can guess why.
Now let’s see what got me so engaged while comparing these two promising air purifiers.
Child Lock
The Child Lock is one of the features that the GermGuardian AC4825 comes without. However, Medify Air MA-15 has this option, which makes it perfectly safe for many households.
If you wish to activate or deactivate the Child Lock, all you have to do is to press and hold your finger for three seconds. This feature is sometimes a must-have for parents who wish to keep their toddlers and their electric devices safe.
Dimmer
One of the best pieces of advice given to those who suffer from sleep deprivation is to eliminate all the lights that could possibly provoke and distract you from having a good night’s sleep. That is why the Dimmer button is so cool.
Medify Air MA-15 has this button installed, and it allows you to control all the LED indicators on the appliance. You can set it in 4 levels and control every indicator’s brightness. If you prefer darkness, simply press the button for as long as the light appears. This feature is a useful tool for those of you who plan to have an air purifier placed in your bedroom.
GermGuardian AC-4825 doesn’t have this button. But, besides the UV-C light, GermGuardian doesn’t have any other indicator that could distress you from your activities. This is a good enough reason for me to think that not having the Dimmer button is not a disadvantage at all.
Filter Reset Indicator
Like I previously mentioned in the intro, the Filter Reset Indicator is one of the common features for Medify Air MA-15 and GermGuardian AC-4825.
A very convenient option for the users since it controls the time when filters need to be replaced. That way, you won’t have to memorize the calendar date or count the days to replace the filters.
Timer
It would be nice to have a Timer option in the GermGuardian features, but that’s not going to happen. On the other hand, Medify Air MA-15 has this option, so you can easily set the time of your air purifiers to do the job. Feel free to pick between 1h, 2h, 4h, or even 8h of continuous in-house air quality improvement.
Airflow
Like in many other rectangularly shaped air purifiers, Medify Air MA-15 has holes spread on each side, where the air comes in. After it passes through the filtration process, it spreads all over the room.
Opposed to the Medify Air, the GermGuardian AC4825 is a tower-shaped air purifier with a whole lot different airflow. The air comes in on the backside, follows the filter line, and comes out frontally. That way, if you stand in front of this air purifier, get ready to be blown at. Don’t worry, it’s only clean air.
Warranty
If you decide to buy the GermGuardian AC4825, you will get a 3-year warranty for your product. With products like this one, you may not even need it, but one can never tell for sure.
But, if you choose the Medify Air MA-15, you will get a lifetime warranty. Pretty awesome, right?
Now, I can tell how many of you already have second doubts about it, and you are absolutely right. There is one important catch.
To be able to have a lifetime warranty, you will have to subscribe to a filter replacement plan on Medify’s website. This subscription means you will have to follow up on the filter replacement instructions every four months, which is quite conditional if you ask me. Personally, I don’t like to be forced into something once I voluntarily purchase the product. I am not sure if I would agree to this kind of plan.
Filtration Technology
Filtration is the most important function of all. It is the core of every air purifier. As I have previously written, in Medify Air MA-15, filters are placed on both sides of the device. That is the reason why this air purifier has a double 3-stage filtration process with a pre-filter, True HEPA, and a Carbon filter. On the other side, GermGuardian AC4825 uses a combination of the charcoal carbon filter and a pre-filter, along with the True HEPA filter. Another interesting thing is that you can use a UV button to activate the UV-C light, as an additional filtration stage.
If I had to pick one of these two air purifiers that do a better job in neutralizing odors, I wouldn’t pick any. The reason is that I am not satisfied with how they perform. Medify Air’s carbon filter uses carbon pellets, but there is not enough quantity of pellets to provide the ensured air quality. On the other hand, the GermGuardian charcoal filter is less efficient than the activated carbon filter. I just can’t pass the fact that both devices have what it takes to be outstanding, but still not using it properly.
In addition to my previous discontent is the fact that none of the pre-filter is washable. Still, I have to praise the True HEPA filter’s existence in each air purifier. I honestly believe it is the crucial filter amongst others.
How To Replace Filter On Both These Devices?
While comparing the warranty issues, I mentioned the necessity of filter replacement at least three times a year in Medify Air MA-15 model, and it’s more than filters of the GermGuardian AC4825 need to be replaced, which is every six months. Also, you might probably need to replace the UV light in GermGuardian every two years. This process might need some extra effort and skills, because of the metal cover that needs to be taken off. But with all the filters in each air purifier, you shouldn’t have any issues.
Another important thing is to clean your filters as much as you can. Even if the Indicator shows no sign to you. Don’t forget to look every once in a while at pre-filters, just in case there is dirt that needs and could be removed. Since the pre-filters are not washable, this is a must-do. Use your vacuum cleaner or a cloth, it can’t get easier than that. Plus, you’re doing a long-term favor to both yourself and your air purifier.
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