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There are many reasons for wanting to buy an air purifier; maybe you have allergies, maybe you want to get rid of cigarette smoke, maybe your life has been taken over by pet dander. Breathing clean and clear air in your own home is something everyone can find value in. Luckily, Honeywell makes a number of air purifiers to choose from.

Honeywell is one of the most respected names in the industry and has the full might of the Honeywell brand to design, engineer, and support a quality air purifier for consumers. So what is special about the Honeywell HPA300? Why should you choose it over other air purifiers? I hope to answer those questions and more in this complete review of the Honeywell HPA300.

====>> In a rush? Click here to see the current price for a Honeywell HPA300 Air Purifier on Amazon

Overview: What’s interesting about it?

Honeywell makes a whole bunch of air purifiers in all different shapes and sizes. Some are made for larger spaces and some for smaller; some have disposable filters, while others have permanent ones. The Honeywell HPA300 is the brand’s top model in its lineup of air purifiers.

Honeywell HPA300 HEPA, Extra-Large Room, Black/Air Purifier

The Honeywell HPA300 air purifier filters dust and pollen using two filtration stages. There is an initial activated carbon filter, sometimes called a prefilter, and then a true HEPA filter. These two stages are able to capture up to 99.97% of air particles larger than .3 microns. A micron is incredibly small. For reference, a single red blood cell can be 5 whole microns big. That means the Honeywell HPA300 catches particles that are more than 10 times smaller than a red blood cell. That’s amazing!

How Does the Honeywell HPA300 Work?

The first stage of filtration is the Honeywell HPA300’s prefilter. The prefilter is a thin black layer made of activated charcoal that covers the whole surface area of the inlet. This filtration layer serves several purposes. One thing this layer does is kill odors. Activated charcoal is a special material that is used as a filter and odor killer in all kinds of industries.

Water treatment plants use activated charcoal to filter water, some shoe insoles use activated charcoal to get rid of stinky feet, and it’s even used in the medical field. While this layer can’t kill every odor in your house, it will kill most and make really powerful odors less noticeable.

The prefilter is also important for filtering out large particles from the air. Things like pet hair and dust bunnies will first be captured by this layer, while the next layer handles the finer particles. This is an important feature in extending the life of the more expensive HEPA filter. Another great feature of this layer is that it is easily cleaned or washed.

When dust builds up on this layer, the filter can be vacuumed or run under the sink. This is important to make sure your machine is always cleaning the air as best as possible and because you will save money over just throwing away dirty filters.

The second filtration step is the most important step in the overall process. After air passes through the prefilter layer, it reaches the true HEPA filter. This is the layer that catches all of the fine particles like pollen, dust, and even some bacteria. HEPA stands for High-Efficiency Particulate Air and is a designation by the U.S. Department of Energy. The requirement by the DOE is that it filters 99.97% of particles larger than .3 microns. You can read about HEPA filters on WebMD to learn about their benefits for people with allergies.

Air purification isn’t the first place where HEPA filters have been used. The filter used in the Honeywell HPA300 is the same type of filter used by responders in a biological attack, and it’s also used in the medical industry by doctors who deal with tuberculosis patients. The HPA300 has three of these filters to help make your air clean and crisp.

Check out the quick video below to see the machine in action!

How Do You Use the Honeywell HPA300?

The Honeywell HPA300 has a few more features than most air purifiers and requires a little reading for users to learn about its settings.

One thing that is confusing about the HPA300 is the buttons labeled “germ,” “general clean,” “allergen,” and “turbo.” These buttons don’t actually change the way it is filtering the air; they are simply speed settings, with “germ” being the slowest speed and “turbo” being the highest speed. Why did they label the speeds this way? Nobody knows. A system of “low” to “high” or “1” to “4” would have made more sense.

On “germ” mode, the HPA300 is virtually silent. This is likely the setting you will want for sleeping or watching movies or reading. “General clean” mode is audible but only at a low level. It makes a nice sort of white noise that you might enjoy while sleeping or reading. The next two power levels are too loud to try and sleep with, but they clean the air like a machine. On the “turbo” setting, the HPA300 can cycle a room’s air five times an hour.

The HPA300 also has three timer settings. You can set the air purifier to automatically turn off after two, four, and eight hours. Of course, you can also just leave it on all the time to run continuously.

I really like how the Honeywell HPA300 has a dimmer button. The dimmer button lowers the lights on the machine so that it is less distracting. Many people will want to have this air purifier running in their bedroom while they sleep or in their living room while they watch a movie, and so having less distracting lights is a good idea.

The Honeywell HPA300 also has indicator lights that come on to signal when it’s time to change the filters. Each filter even has its own light.

The manual says the HPA300 is good for rooms up to 465 square feet, but lots of people use it in even larger spaces. 465 square feet is about a 21 x 22-foot room, for reference. Even though it’s made for large spaces, the HPA300 can also be used in smaller rooms and will be able to cycle the air even faster.

I really like the way the Honeywell HPA300 works compared to most other air purifiers. The HPA300 pulls in air from the front and then spits it out the top after filtering. This is great because you can have it set aside and out of the way. You can even put it up against the wall. Most air purifiers pull air from the back and spit it out the front.

This means that you need to have most air purifiers away from walls and corners so they have access to the air in the room. But who wants to have one of these things sitting in the middle of the room?

What Is the Cost of Filters, Where Do I Get Them, and How Often Do They Need to Be Changed?

There are indicator lights on the Honeywell HPA300 that tell you when it’s time to change your filters. Usually, the schedule is to replace the prefilter every three months and replace the HEPA filters every year. You can also extend the life of your filters by vacuuming them once a month or more and cleaning your prefilter.

When the time comes to change filters, you, fortunately, have options. The activated charcoal prefilter can be bought in large sheets, which you can then cut to size using scissors. This option is super economical and leaves you with extra filters that you can swap out when you want. You can also buy precut prefilters that fit this unit specifically. This is a bit more expensive, but the activated charcoal isn’t very expensive, to begin with. You can find both of these options on Amazon.

The HEPA filter cannot be washed like the prefilter can, though it can be vacuumed to help make it last longer. When the time comes to buy new ones, they can be found at most retailers who sell things like this, like Walmart, Target, Staples, and Amazon. The Honeywell HPA300 air purifier filter pack value kit has an MSRP of about $80 but can be found at a better price on Amazon.

When buying your HEPA filters, remember that the HPA300 uses three filters. Most places sell these filters in packs of one, two, and three, so make sure the one you buy says “3-pack” on the box.

What Is the Warranty?

The warranty for the Honeywell HPA300 is five years. Honeywell is a large company and has the resources to honor its warranties.

What Are the Cons to Owning the Honeywell HPA300?

There aren’t many downsides to the HPA300. Most people are satisfied with the build quality and the way it operates. I will say that, for the price, this air purifier seems to be missing some features that other air purifiers have, like UV light to kill germs. It’s possible that Honeywell engineers found the UV feature doesn’t add enough benefit to be worth it.

How Does It Compare to other models?

Honeywell HPA300 vs HPA200

The only difference between these two models is the size and the price. The HPA200 is made for smaller rooms and doesn’t cycle air quite as fast as the HPA300. The HPA200 is also smaller and only uses two HEPA filters, while the HPA300 uses three. That means the HPA200 is cheaper to operate. If you are trying to purify the air in a large space, then I recommend buying the Honeywell HPA300.

Honeywell HPA300 vs Winix 5500-2

The Honeywell HPA300 and the Winix 5500-2 are pretty comparable models. They look similar; they are both wide and black. Both suck in air from the front. Both have timers and four speeds. Many people will like that the Winix has a remote control.

This is helpful for people who don’t want to walk over to their air purifier to adjust settings every so often. The Winix also has an “auto mode” that adjusts the fan speed based on the air quality in the room. This is a great feature for people who just want to leave their air purifier on all day. The Winix also costs about $30 more than the Honeywell.

One advantage of the Honeywell is its ability to handle larger rooms. The Honeywell can handle larger rooms of 465 square feet, while the Winix is only rated for 360 square feet.


The Honeywell HPA300 is great for people who want to purify the air in a large space. People with large open floor plans will like how it is able to quickly cycle through the air in a large space. Also, people who just want to tuck their air purifier away in a corner or against a wall will like the HPA300 because it sucks in air from the front and shoots the clean air out of the top.

There is no need to stick this purifier in the middle of a room! I wouldn’t recommend the Honeywell HPA300 for people with severe allergies or people trying to kill mold spores in the air since it does not have UV light. People with normal allergies or people who just want cleaner air will love the HPA300.

Where Can You Buy the Honeywell HPA300 and How Much Does It Cost?

The Honeywell HPA300 can be found at most big box stores. Walmart, Target, Best Buy, and Amazon all carry the HPA300. The MSRP is about $300, but you can usually find the HPA300 on Amazon for way less than that. You can click below to check the price now on Amazon!

Click Here to See the HPA300 on Amazon

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