Honeywell HPA300 Allergen Remover – Best Air Purifier for Large Spaces?

Recent years have seen a shift away from closed-off individual rooms in our homes, to large open-plan living spaces where families can relax, eat and socialise together.

Recent years have also seen a growing awareness of the issue of indoor air pollution.

The World Health Organization now considers it to be a real threat to the health of millions of people across the globe, and some research studies have estimated that the air we breathe inside our homes and workplaces can actually be up to 5 times more contaminated than that outside.

Air purifiers can help to improve the quality of our indoor air.

They work by removing a whole host of nasty airborne pollutants and allergens, such as mold spores, dust mites, pollen and pet dander.

But before you part with your hard-earned cash you need to be sure that any air purifier you buy can adequately cope with the size of space you have.

If you’re a fan of open-plan living, or have a particularly large area you want to purify – such as a basement, studio or workshop – the Honeywell HPA300 True HEPA Allergen Remover may just be the air purifier for you.

It’s powerful enough to cope with big spaces, but doesn’t come with a matching big price tag.

Read on for our full review, including pros and cons and our independent star rating.  Or hop to the information you’re most interested in by clicking on a link in the table below.

In a rush?  Head to Amazon for the latest prices on the Honeywell HPA300

Who Are Honeywell? 

If you’ve ever searched online for air purifiers before you’ll probably have come across the name Honeywell.

They’re an established leading brand with 25 years of air cleaning expertise, and pride themselves on offering high quality products which make life more convenient and comfortable for consumers.

Their extensive range includes items such as humidifiers, portable air conditioners and air purifiers.

The HPA300 is one of the models in the air purifier portfolio, and the one we’re going to examine in more detail now.

How Exactly Does The Honeywell HPA300 Clean Our Air?

Air purifiers work by drawing in the air contained within a room.  This air is then passed through a series of filters, where pollutants are trapped, before ‘clean’ air is blown back out the machine.

The filters are the key to how effective an air purifier is at removing pollutants.  For the very best possible air cleaning performance you want a unit which comes with a HEPA filter.

HEPA filters are the gold standard when it comes to air filtration and are used in many hospitals and by the military.  That’s because these types of filter have smaller holes in them than regular ones, allowing them to hold onto even the most microscopic of contaminated air particles.

In order to be HEPA-certified, a filter needs to be able to capture up to 99.97% of particles down to 0.3 microns in size.  This covers household dust, pet hair and dander, pollen, mold spores, and certain bacteria, viruses and smoke particles.

The good news is that this particular unit features a HEPA filter.  The clue is in its full name – the Honeywell True HEPA Allergen Remover (‘True’ indicating a genuine HEPA filter as opposed to a ‘HEPA-style’ one).

But it also features a second level of air filtration – an activated carbon pre-filter – which we’ll take a look at now.

Activated Carbon Pre-Filter for Enhanced Purification

We discovered above that the Honeywell HPA300 air purifier is fitted with a HEPA filter.

Before polluted air particles even reach that though, they pass through an activated carbon pre-filter.

The purpose of this pre-filter is three-fold.  Firstly, it holds onto larger-sized particles and so extends the life of the more expensive HEPA filter.

Secondly, the activated carbon acts like a sponge and absorbs unpleasant odors, such as cooking and pet smells.  So you can also enjoy a much nicer smelling home, in addition to the benefits of enjoying healthier air.

Thirdly, it also helps to remove some potentially harmful gases that are lingering about in your indoor air, including some Volatile Organic Compounds.

These chemical cocktails are given off by many different products that most of us will have around our homes and use on a daily basis, without even realising they may be having a negative impact on our well-being.

4 Air Cleaning Levels To Suit Your Own Needs

The Honeywell HPA300 has 4 different air cleaning levels for you to choose from, depending on how much filtration you need at any given time.

These are Germ, General Clean, Allergen and Turbo.

Generally speaking, the harder the unit is working, the more noise is generated.  But air purifiers are for the most part pretty quiet, and many customers who’ve bought this unit even go so far as to say that they find the ‘white noise‘ soothing, particularly at night time when nodding off to sleep.

Of course, noise is a very subjective thing.  What’s quiet for one person may prove a distraction for another.  From lots of research into this unit I’d say opinion is split a little.  There are many people who say it’s virtually silent on the Germ setting and barely audible on the General Clean.  But others reckon there are quieter models out there.  That’s probably true – I’ve reviewed other air purifiers which feature special technology which makes them ultra-quiet.

That said, some other units may not be able to match the room capacity offered by the Honeywell HPA300.  It’s a bigger unit because it can clean bigger spaces, and bigger units tend to generate a bit more sound.

It’s crucial when choosing an air purifier that you go for one which can adequately cope with the size of space you have.  If you go for one which is recommended for use in smaller spaces – because you prefer the look of it, or think it’ll be quieter, or it has snazzy features – then it won’t be able to do its job properly and at the end of the day will just be a waste of money.

Let’s take a look now at the room coverage offered by the Honeywell HPA300.

What Size of Room Can the Honeywell HPA300 Allergen Remover Be Used In?

Honeywell say the HPA300 will filter and circulate the air 5 times an hour in a room up to 465 square feet.

So the room coverage offered by this unit is really impressive, and is ideal if you have a large open-plan space that you want to purify.

It’s also a great choice for basements and other big spaces such as an art or dance studio, workshop, or open-plan office.

When choosing an air purifier it’s a good idea to pay close attention to the manufacturers’ guidelines on room coverage.  You might see something advertised which claims to offer coverage of, say, 400 square feet.  But when you actually look into the small print in the User Manual this maybe only relates to perhaps 2 air changes per hour, and that for more air changes the coverage is actually halved.

2 air changes per hour are normally considered fine for regular residential use, but if you suffer from asthma or allergies then a minimum of 4 air changes per hour are recommended.

Another little point on the subject of coverage – air purifiers always work best when your windows and doors are closed.

OK, so we’ve established that the Honeywell HPA300 has really good filtration power and offers great coverage for large spaces.  Let’s take a look now at the other key features it has to offer.

Auto Shut-Off 

The Honeywell HPA300 air purifier has a feature which allows you to program the unit to switch off after a certain period of time – 2,4 or 8 hours.

This is handy particularly at nighttime as it means you can set it to go off once you’re asleep.  No need to get up in the middle of the night to turn off!

Filter Indicator Light

As the name suggests, there’s a light which comes on when your filter needs to be replaced.  Useful if you’re like me and have a memory like a sieve sometimes!

On the subject of filter changes – this is an unavoidable part of air purifier ownership and can’t really be skipped I’m afraid.  Failing to change your filters regularly leads to them getting clogged up and unable to properly trap contaminated air particles – they’ll just pass through the machine and come back out again.

As to how frequently you need to change them – well, that varies from model to model, and of course how long you run your air purifier for, and how dirty the air inside your home is.  There’s no one-size-fits-all as such.

As a guideline, Honeywell recommend that you replace the pre-filter every 3 months, and the HEPA filter once a year.  Changing them is a simple process – no tools are required.

Before you invest in an air purifier it’s a good idea to know about any ongoing costs upfront.  Knowing in advance that you’re going to have to pay a certain amount at regular intervals allows you to budget, and saves any surprises later on.

Generally, replacement filters work out at a nominal cost when broken down to a daily amount, and are a pretty reasonable price to pay for the benefit of healthy air, but do always do your sums before buying if possible.

Check out the latest filter prices on Amazon

Honeywell also state that you should also only use their certified replacement filters.  I’ve seen chats on forums where some people have said they use other brands instead because they’re cheaper and have had no problems.  While you’re completely free to do as you please, just be aware that using non-certified filters will probably render your warranty null and void, and you’ll have no comeback with the manufacturer in the event of any future issues.

Dimensions and Weight

The Honeywell HPA300 air purifier weighs in at 21 pounds and size-wise measures 20 x 9.2 x 22.25 inches.

There’s a built-in handle at the top of the unit on each side, meaning you can move it from room to room if you like, but there are no castors so bear that in mind if you think you’d have difficulty lifting it.

The unit only comes in a choice of black.  My own personal opinion is that it looks a little more functional compared to some other units out there.  But at the end of the day performance should be the number one consideration, so if this ticks the boxes on that front does it really matter so much if it does look a little utilitarian?

It’s certainly not offensive to look at by any means, and its design – where air is pulled in the front of the unit and expelled out the top – means it can be placed against a wall, unlike some other units which draw air in from all angles.

Operation of the unit is manual – there’s no remote control.  The control buttons are located on the top of the unit and are touch-sensitive, and are lit by blue lights which can be dimmed if you wish – handy if you’re easily distracted by light at bedtime.

Energy Star Certified 

A further advantage that the Honeywell HPA300 air purifier has over some of its competitors is that it has received Energy Star certification.

Administered by the US Environmental Protection Agency, products which have received this award have been independently tested and found to save energy without sacrificing functionality or features.

Energy Star certified air purifiers are 40% more efficient than standard models, saving consumers an average of $30 annually on their utility bills, as well as being better for the environment.

In terms of energy consumption, the HPA300 consumes 127 watts on its highest setting, and 0.3 watts on standby mode.


The Honeywell HPA300 Allergen Remover comes with a 5 year limited warranty.

This is pretty good, as some manufacturers only offer 2/3 years.  There are some models out there which come with a lifetime warranty but they also tend to have a much higher price tag than the HPA300.

Always read the warranty small print carefully for any exclusions or conditions you need to satisfy.  As discussed earlier, using non-Honeywell certified replacement filters in your purifier will probably render your warranty void.  Using it in a different country other than the one you purchased it in may do so too.

Customer Feedback for the Honeywell HPA300 Allergen Remover

The Honeywell HPA300 is a really popular model which has been around for 7 years or so.

One popular online shopping platform has (at the time of writing) over 1500 reviews for this unit, many of them giving it a 4 or 5 star rating.

Among the positive things that customers have to say about this unit is the big difference it has made to their allergy symptoms, with many people reporting a dramatic improvement since they began using the purifier.

Many people have also mentioned a significant drop in dust levels inside their homes since they began using the HPA300, as well as noticing that their homes smell more fresh.

On the downside, a few customers have reported issues with the filter latch door, or noticing a chemical smell when using the purifier for the first few times.

A few others don’t like the fact that you have to cut the replacement pre-filter to size yourself before you put them in the unit. It comes in a large sheet with a template of different sizes for different Honeywell air purifier models – you should have enough for 2 pieces in each pack.  Other customers have said it’s very easy to cut, so it just comes down to personal preference and whether you’re happy to do this or not.

Overall, customer feedback for the HPA300 is very positive and mirrors a lot of what we like about this unit…

What We Like About The Honeywell HPA300 Air Purifier…and Who We Wouldn’t Recommend It For

If you have a large space then this really is a great option worth considering.

It overs excellent coverage for plus-size rooms and open-plan areas, and can turn the air around an impressive 5 times an hour.  Some other models can only refresh the air twice an hour in a space this size.

As we saw earlier, a minimum of 4 air changes per hour are considered best for allergy and asthma sufferers.  But you don’t need necessarily to be affected by one of these conditions to benefit from an air purifier.  Maybe you’re just concerned about what you and your family are breathing in, and are looking for something to make your indoor air cleaner and healthier.

Or perhaps you have pets in your home.  You love the companionship they bring, but you don’t necessarily love the less-than-fragrant smells that can often accompany them!

The Honeywell HPA300 is  also fantastic value for money.

We all like to feel like we’ve gotten a good deal and not been short-changed.  The HPA300 is up to 50% cheaper than some other models I’ve reviewed which offer similar room coverage.  It’s also cheaper than many other air purifiers that DON’T offer nearly the same level of coverage.

The activated carbon pre-filter and HEPA filter do all you need them to in terms of removing airborne particles and bad odors.  And as the unit is Energy Star certified it means you can save on your energy costs, as well making a better choice for the environment.

So, you’ve probably guessed that we really like this unit!  But that said, there are still a few things we feel won’t make it suitable for everyone.

It lacks a little of the techy features that come with some other models.  For example, there’s no automatic air quality sensor which adjusts the fan settings for you, depending on how many pollutants it detects in the air.

Nor does it come with a compatible app.  Some other models are now utilising app technology and you can receive updates on air quality straight to your phone, or control your air purifier remotely.

And a few folks might prefer a unit which looks a bit more sleek and futuristic, or something which is a real standout talking point or that can be wall-mounted.  The HPA300 is arguably a little more functional-looking than some other purifiers out there.

So, if you don’t have a particularly large area that requires something as powerful as the HPA300, and you like lots of technology/cool looks, then you might prefer something else.

For us though it’s definitely at the top of our list for the best air purifier for large spaces, and we award it an impressive 4.5 out of 5 stars!

Think this might be the unit for you? Price check now on Amazon

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