Best Air Purifier Deals: Up to $270 Off Coway, Blueair, Dyson and More - CNET

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Tackle pesky allergies and eliminate unpleasant odors in any space with these powerful -- and quiet -- air purifiers now on sale.

Air purifiers not only help improve the quality of the air, but by removing allergens and other pollutants, these nifty devices can also help you sleep better. A massive range of models is available on the market, designed to fit all spaces and sizes. While Black Friday is still a few weeks away, we're already coming across some major discounts that are worth considering ahead of the sales event.

Read more: HEPA Filters and the Physics of Fresh Air

As one of CNET's dedicated deals writers, Adrian Marlow has years of experience helping readers take advantage of great bargains and has scoured the web for the best prices out there on top-rated air purifiers. These include savings on all three of our top performers, as well as other deals from trusted brands like Dyson and Coway. This list is updated regularly as deals expire and new offers crop up at various retailers, so keep checking back if you don't see the right model right now.

While it doesn't appear on our list of best air purifiers, it's hard not to consider this Morento MR5866 air purifier as the best deal due to its large square feet coverage (1,290) as well as its $200-plus discount. This is the cheapest we've ever seen at Amazon, made even more affordable by an additional $30 coupon that is found on the page. That means you're only spending $82 for a model with dual air intake, smart app controls, voice control, a dual-layer filtration system that uses HEPA filters and a sleep mode that operates at 23db. A bargain.

Shark's Clean Sense Air Purifier Max with odor neutralizer technology offers four speeds of purification depending on the air quality around you. It is designed for large spaces like living rooms, dining rooms and basements, with 1,200 square feet able to be cleaned based on one air change per hour.

Though this Kenmore Smart 2300e has only an 11% discount at the moment, it still deserves a spot on this list as our favorite air purifier for large spaces. It's equipped with a three-stage HEPA filter that captures particles down to 0.3 microns, and it's designed for coverage of up to 2,300 square feet. It also allows you to change modes, adjust the fan speeds, check your home's air quality level and more using the companion app.

Down by more than $30 at Best Buy, this Blue Pure 411i Max air purifier is perfect for small bedrooms, offering a range of 219 square feet. It's also known for being quiet and having a Clean Air Delivery Rate of 141 for fine smoke particles, dust and pollen. While its sister model -- the Blue Pure 311i Max -- is our favorite on the market, this is just as good for small spaces.

A top brand with a decent discount applied. This Dyson Purifier Cool Gen1 has plenty of features to perfect your space, like preset run time, night mode, a remote control and 350-degree oscillation that makes sure the air circulates throughout the entire room.

This Morento dual-air model has been reduced by a huge $218, thanks to a 63% discount at Amazon and an additional coupon that knocks off $30. Just make sure to tick the coupon box. It has a square feet coverage of 1,290 with Wi-Fi and Alexa compatibility built-in. On top of this, there are three adjustable fan speeds, low noise of under 23db, voice control and HEPA filters for purifying particles as small as 0.3 microns.

If you're looking for an air purifier with true HEPA filtration technology powerful enough to cover your entire house, this is a solid pick. The price tag is hefty, yes, but if you are going to have to buy multiple air filters for different rooms, this one-stop machine might be worth the price, especially with the current discount. This air purifier has multiple fan speed settings, smart settings that adjust fan speed according to air quality and timers and it will cover up to 1,560 square feet of living space.

CNET's team of home tech experts have taken care of most of the legwork by putting some of the most popular air purifiers on the market through rigorous tests, evaluating their particle-removal efficiency, noise levels and energy consumption. Above, we've rounded up the best prices you'll find at the moment on our top picks for small, medium and large rooms, along with a few other bargains from other trusted brands like Dyson and Coway.

There are quite a few factors that affect how often you should be changing your filter, including how polluted your air is and how often you're running the purifier. As a general rule, roughly every six months is what most brands recommend. However, many air purifiers also have a prefilter that traps larger particles like pet hair, which should be changed or cleaned more frequently to ensure optimal efficiency.

If you've been shopping around for a new air purifier, you've probably seen the term "HEPA filter" thrown around quite a lot. HEPA stands for "high efficiency particulate air" and refers to a filter standardized by the US Department of Energy for filtering a specific size of particulate matter out of the air. These particulates can include dust, bacteria, viruses, pollen, smoke and mold, and in the US, HEPA filters are required to remove at least 99.7% of particles down to 0.3 microns in size out of the air. If you're looking for more info, Coway has an excellent breakdown on its website.

For maximum efficiency, you'll want to keep your air purifier as close to the center of the room as possible. However, it will still function fine if you keep it somewhere a little less obtrusive, as long as you make sure the input and output vents aren't blocked. It's also beneficial to keep it near doorways and vents with airflow if possible.