Coway Airmega 300S App-Enabled Smart Air Purifier (Covers 1,256 sq. ft.), True HEPA Air Purifier with Smart Technology, Compatible with Amazon Alexa

I love a lot about this air filter. I really like the smart features. I originally thought they would be gimmicky, but after living with it for a few weeks I have experienced the value. I love that it detects the airborne contaminants, and increases air circulation to clean the air. I’ve noticed that it increases air flow during high traffic and vacuuming, among other things. I like that I can check the app for air quality, and I can see past air quality as well. I like that the filter knows when it’s bedtime and decreases airflow, in order to keep noise pollution down, for quiet tearfulness.Now on to effectiveness. We have a nearly 3000 square foot new construction home. It’s about three years old. Most of our air contaminants likely come from area construction, as well as a year round growing season, with year round pollen and similar contaminants. My oldest child has had a persistent hack for the last couple of years. I would not really call it a cough, so much as a hack. Every few minutes he would do a throat and lunch clearing cough. It never seemed short of breath, just seemed to be clearing an irritant. We took him to doctors, who suggested everything from allergies to asthma. We sort of ruled out asthma because he is athletic, and has no issues out working other children, and displays no unacceptable shortness of breath, other than what you expect, and recovery times are quicker than normal. As a previous asthma sufferers myself, that does not resemble asthma to me. We opted to try daily allergy medications, and they seemed to help some, but did not eliminate that dreaded hack. Now I said all of that to say this. Since we added this filter, we hardly ever hear him clear his lungs. I’m actually surprised, because I assumed it would take much longer. I figured he had been doing it long enough that it was a habit by now. But after a few days of filtering, his symptoms diminished, and after a week or so, he almost never does it.Now our home is nearly double the size of the the filters rated coverage area. But the design of our home, I think, allows one unit to work. Our central air unit has only one air return, and it is at the blower unit. This is located centrally, upstairs, in a closet with a vented door. The area around that closet is sort of an open landing area, that opens to a large family room. I think what is happening is that the filter can clean large volumes of air, that then get circulated through the house. The dirty air is then pushed back up to that open area, and filtered by the unit. The unit can tell when air is clean or dirty, and increases, or decreases circulation, accordingly. Anecdotally this seems to be a successful test, eliminating our primary concern. The side benefit is the remainder of our family is now breathing cleaner, healthier air. It just took one sensitive member to illustrate the need. I wish I had known this would solve the problem, and I wish I had done it sooner. I expected to need to units to have a successful result, and I’m so pleased that one unit does the job. Not every home may have the same results. Some may actually need two units to do the job.Also, I opted to shop the amazon warehouse deals and save a bunch of money. I bought a used acceptable condition unit. It arrived in a generic box, but everything was still protected by the factory foam, and cling wrap. Everything appeared new, and worked perfectly. If you want to save s big percentage, I highly suggest checking out the warehouse deals. If your displeased with the condition, Amazon has a very generous return exchange policy. My filters in my unit looked brand new and unused. But if I were concerned, new filters are about $100, so you could still have significant savings, even if you opted to put brand new filters in it right away. At first I was put off by what seemed like a high filter cost. Then I recognized what I was spending on allergy medication each month, for one child. The filters provide clean, allergy free air for the whole family, at a fraction of the cost of allergy medications for one child. By reducing our allergy medication costs, we can replace filters as needed, an no added cost.I would have thought building a new home would prevent these issues, but the other new construction in the area, seems to exacerbate the issue.I also weighed the option of an Aprilair, or air bear system on our central air unit, but I was concerned about the designed air flow for our system, and any disruption could shorten the central air life, increase energy needs, and decrease overall home comfort. Those air filters work great for a system designed and tuned for their use. But for a system designed for a more or less open fiber filter, it could cause problems. So I decided a stand alone filter would be the better option. Also those air handler systems that go on your ariconditioner unit, are not usually helps rated. The AIRMEGA 400s is. And it is constantly monitoring, and cleaning the air. It also uses no harmful ozone. I’m an ozone fan, and I own an ozone generator. But I like to use it in specific situations, under controlled conditions, when all occupants can be out of the house. I don’t want ozone to be a part of my primary home air filtration system. Others may have different priorities, and I encourage you to research the benifits and precautions, and choose according to your needs and priorities.

This is a great air purifier! Been using it for about a month now and no issues at all. Wi-Fi is solid if you have great connection. I have an Orbi Mesh system so I never have an issue with connectivity. Alexa voice command works fine, but limited to Power and Fan Speed. You can’t ask Alexa for air quality status or what current unit mode is. App works great. Will notify you if air quality changes. You can control the unit with the app, check filter status, and also set schedules if you want. Level 1 is practically silent. Level 2 is louder, but doesn’t interfere with being able to hear things. Level 3 is pretty loud. Sensor works fine. If it detects unhealthy air (cooking, candles, pets) it kicks up to Level 3 right away and gradually goes down as air improves. You can adjust sensor sensitivity through the app. Pre Filter must be washed around 2-3 weeks. Main filters are rated to last 1 year, but I can’t attest to that yet. After 1 month, my main filters are down to 88%. Make sure the left and right sides of the unit are not being blocked and do not put it against the wall or furnitures. These two sides are where the dirty air is sucked in and clean air returns from the top so don’t put anything on top of the unit either. If the sides are blocked, the unit will not run efficiently so try your best to place them free of all obstruction. You can put the back of the unit against the wall, just not the sides.My only other advise after doing some major research on air purifiers and getting the most benefit out of one is to leave it running 24/7 without depending on Smart Mode. This is the only way you can guarantee clean/fresh air because it will never enter Sleep Mode and wait for a trigger. I leave mine on Level 2 from 7am until 2am. Then I have it run on Level 3 from 2am until 7am when we’re all asleep upstairs in the 2nd Floor so we don’t even hear it. Yes my pre filters get dirtier faster, but that’s the point right? To eliminate air impurities as much as possible. One last thing. The circle lights of the filter status indicator on the unit decreases as the filter gets down in increments of 20%. So at 80%, 1/5 of the circle is off and half the circle is off at 50%. Some think this is the LED dying already. It is not. It’s actually a feature so you can quickly see directly on the unit if the filter needs cleaning/replacing. The light completely turns off when it’s down to 0% and the word “Clean/Replace” turns red. Once you clean/replace the filter, you can reset it and the entire button illuminates again by holding it for 3 seconds. I think that covers it all pretty much.