Holmes HAP424-NU Air Purifier: Trusted Review & Specs

The Holmes HAP424-NU has everything you will want from a Holmes tower air purifier: good-looking appeal, modest performance, attractive price. It is also one of the most popular air purifiers of The Holmes Group, and has at least 250 customer reviews on Amazon. Now being sold along with the Holmes HAP9424B-NU and Holmes HAP9422-NUA as the three main tower stars of this brand, let’s read the Holmes HAP424-NU Review to see if it is worth to be the best seller one again.

The air purifier seems to be discontinued, so we recommend you to check the review of Holmes HAP8650B instead. Or if you need a desktop air purifier, you can search for the Holmes Desktop Air Purifier.

Holmes HAP424-NU ranks D+ in our air purifier ranking list. We give the biggest and most thorough database of air purifier reviews in the world.

UPDATE: As the Holmes HAP424-NU appears to be fully sold out, I recommend properly checking our deal before reading this review, as the review itself is pretty lengthy.

In Breathe Quality, we have reviewed all air purifiers under these sections. Also, we guarantee that:

• We do give honest reviews (both pros and cons) so anyone will guarantee to have the wisest choices.
• We do not (and never) exaggerate one product just to let you click the links and buy that product blindly.

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Holmes has been in the world of air purifier of the United States for more than 35 years, under the name of The Holmes Group. Now, being acquired by the Jarden Corporation, this brand has a chance to improve their air purifiers to a next level. We are reading about one of the best sellers of this brand, the Holmes HAP424-NU. In this Holmes HAP424-NU Review, we will know the reason to buy it or not.

Other Holmes’s Air Purifier Reviews:

Holmes HAP424-NU Price

You would really consider buying the Holmes HAP424-NU if you are living in 10 years ago. Back then, the development of air purifiers is still weak, and the manufacture of True HEPA filter is not as competitive as right now. If you are a regular, rather than a habitual user, and just want an air cleaner for your home, then look no further.

The Holmes Group is making a strong attempt to win all the market share in under $100 market, thanks to their mass army of HEPA-type and ionizer air purifiers. But for now, a True HEPA air purifier under $100 is not a strange thing, and pushing the price of the HEPA-type air purifiers to a much lower point is the only way for Holmes to compete.

Then we have the latest HEPA-type tower air purifier of this brand, along with the Holmes HAP9424B-NU, the Holmes HAP424-NU is truly a sleek and beautiful tower device. With 29 reviews in the Holmes website, we can conclude that the Holmes HAP424-NU is the most favorite air purifier of the whole brand.

Back to the price of this Holmes HAP424-NU, it is officially $69, which is cheaper than the other two HEPA-type tower air purifiers. However, to pay that much for an inferior HEPA-type air purifier, does The Holmes Group push a little too far? It is also out of stock at the moment.

In this price range, the era of compact tower air purifiers has rising, thanks to the fame of Levoit Vista 200 or AeraMax 100. We can also have the strong contenders with True HEPA filter to consider, like the PureZone Halo or Honeywell HPA060. So to say, even the best seller Holmes HAP424-NU can’t guarantee the first place for Holmes in the race of budget air purifiers.

Finally, I want to inform you the two closest versions of this Holmes HAP424-NU, the representatives of the Canadian brand – Bionaire, in name of Bionaire BAP825WO-NU and Bionaire BAP536UV-U. I am really excited to wait for the review of these two Bionaire air purifiers.

Related post: Best air purifier 2023.

Holmes HAP424-NU Design and Size

Holmes HAP424-NU is not a new device, but the slim tower design is unique for this air purifier alone. Looking for the Canadian counterparts, the Bionaire BAP535UV-U and Bionaire BAP536UV-U share the same design with this air purifier, but there is still the top control panel to differentiate.

We can easily see the Holmes HAP424-NU places the emphasis firmly on design concept. It has strong base, with separated cover from the front air intake grill. This air purifier uses the classic back-to-front air flow system concept, so you can only replace the air filters from its back.

Source: Amazon.com

Holmes HAP424-NU stands tall with 28 inches in height, but the depth is only 11 inches, and this air purifier is really slim for the appearance. But that slimness is exactly what make it our favorite air purifier, right?

On top of this air purifier, there are two convenient manual switches to change the fan speed and turn on the ionizer function. You can also see one LED indicator for filter replacement here.

Source: Amazon.com

Finally, our today unit weighs only 11 lbs, and don’t worry, I bet you can move this air purifier easily.

Related post: Best air purifiers for bedroom.

Holmes HAP424-NU Filters

To decide the performance of one air purifier, you will need to know about the quantity and quality of its air filters, as well as the air filter types are used. The Holmes HAP424-NU has the traditional 2-stage air cleaning system of tower air purifier as below.

1. HEPA-type filter – It is not a True HEPA filter, and the quality is much inferior. But the air filter from Holmes HAP424-NU is said to clean 99% of any particles down to 2 microns in size.
2. Ionizer – The technology of ionizing air purification from Holmes, which complies the standard safety of CARB completely.

Just like the previous tests for Holmes air purifiers, I chose the room area of 100 square feet to test the performance of this Holmes HAP424-NU. I also added the Holmes HAP716-NU and Holmes HAP706-NU to show you the inferiority of the HEPA-type air filter from Holmes HAP424-NU. As you can see, Holmes HAP424-NU secured an efficiency of only 90% for trapping any particles down to 0.3 microns, which is a lot lower than the HAP706-NU with at least 99%. So to say, if you have serious allergies and asthma to airborne pollutants, you should consider upgrade the True HEPA filter inside this device.

You can use the air filter HAPF30AT HEPA-type flter in this Holmes HAP424-NU, which costs you $17 for 6 months of use. Moreover, the True HEPA HAPF300APD is also suitable for this air purifier, but it will cost you $44 for a pack of two air filters. However, the efficiency of this air purifier will increase from 90% to 99%, which is a difference of 10% in efficiency.

Related post: Best air purifiers for allergies.

Holmes HAP424-NU Room Coverage

We believe the Holmes HAP424-NU is the better version of the compact Holmes HAP412BNS-NU. As a result, this air purifier will cover an area of 180 square feet with ease.

The ACH of Holmes HAP424-NU is 4X. This air purifier can clean your room in every 15 minutes.

The CADR of Holmes HAP424-NU is 116 cfm in general.

Related post: Best large room air purifiers.

Holmes HAP424-NU Sound

Again, this is a tower air purifier, and Holmes HAP424-NU doesn’t perform well without any sound. The measured noise level on highest speed of this Holmes HAP424-NU is about 55 decibels (db), which is the common noise level of electronic appliances, and you can’t ignore the sound completely.

If you want to use the Holmes HAP424-NU in areas like bedroom or office, please make sure to keep the air purifier at least 100 feet from you. Or you can reduce the fan speed to low setting and enjoy the partially no sound.

Related post: Best air purifiers for baby.

Holmes HAP424-NU Power Consumption

One of our most FAQs is “Do air purifiers use a lot of energy?” In fact, air purifier must be used for a long time to be efficient. And power consumption is one important criteria to review how much energy this air purifier will consume.

The power consumption of this Holmes HAP424-NU is 85 watts, which is not too high, but not low, either. If you want to save more energy, you must sacrifice the size and the performance rating, to buy the Holmes HAP412BNS-NU instead.

For running the Holmes HAP424-NU 8 hours per day, you need to pay $30 each year.

Related post: Best air purifiers for pets.

Holmes HAP424-NU Additional Features

Just like all tower air purifiers in this family, the Holmes HAP424-NU comes with nothing, yes, no timer, no functional mode, no everything. There is only one simple LED indicator for filter replacement in this Holmes HAP424-NU. Other than that, you don’t have any additional features when buying this device.

Related posts:

1, Best air purifiers for smoke.

2, Best air purifiers for dust.

3, Best air purifiers for mold.

Holmes HAP424-NU Customer Service

Even being acquired for more than 10 years, the Holmes products are still one of the most popular electric appliances today. Then the reason can only be their impressive customer service. If you need to contact them, you can easily do so by filling in the information at their Contact page, or calling them via phone at 800-546-5637.

Once you make an order, you will get your Holmes air purifier with a promotion of Free Shipping over $50. However, the promotion is only applied at the time of writing, so if you can’t find the Free Shipping option, you should choose to buy from Amazon. The most wonderful thing is, after your purchase, or any reason you are not completely satisfied with the Holmes air purifier, you can return your item within 30 days of receipt for an exchange or refund of the purchase price. Great, isn’t it?

And don’t worry about your air purifier, it will be backed up by a great 5-year warranty from The Holmes Group. This is also the best warranty for an air purifier brand that only targets low-range segment.

Our verdict

Okay, so the Holmes HAP424-NU is really the most favorite air purifier of The Holmes Group, thanks to its sleek design. However, the sub-standard performance of this air purifier is really what keeps me from buying it, and I recommend you to think again. If you are really in love with Holmes, you should choose the Holmes HAP716-NU or Holmes HAP706-NU for a True HEPA performance, or you need to buy the Holmes certified True HEPA filter to add in the Holmes HAP424-NU right now.

Right now, the air purifier is discontinued.