Best Air Purifiers for Energy Efficiency (2024)

The Blueair HealthProtect 7470i is an air purifier designed for use in rooms up to 91 square meters.

It can trap and remove particles as small as 0.1 microns, including common allergens such as pet dander, mold, pollen, and dust.

The 7470i is also capable of handling tougher pollutants, such as VOCs, viruses, odors, and smoke, thanks to its powerful setup.

The most interesting element is the large LCD touch interface located at the top of the unit.

The 7470i can also connect to Wi-Fi and is compatible with Blueair's app.

This app allows for remote control over its functions and access to metrics.

Blue Air has done a nice job of giving it a sleek design that isn't too brash, while still conveying that it's a high-end piece of equipment.

The metal cage is constructed with wheels on the bottom for easy movement.

The 7470i is also compatible with Amazon's Alexa virtual assistant.

At its lowest speed, it uses a mere 9 watts of power while producing only 25 decibels of noise.

Even at its most powerful, it reaches just 45 decibels.

Make it 10% quieter than the average air purifier.

This air purifier features a fabric pre-filter, a proprietary particle filter, and an attached carbon filter.

The Blueair 311 Auto is rated to filter spaces of up to 250 square feet.

It does not have a HEPA filter; instead, it has a proprietary particle filter.

It's only got one button, offering super simple control.

The auto feature is nice because it automatically senses the amount of pollution in the room.

This unit does not have a timer, and it also doesn't come with a remote control.

The reason it's so lightweight is that it has a very unique design.

The pre-filter is fully exposed here, so you will see it become dirty over time.

The fabric pre-filter is available in several colors.

It also has very good noise output, with very low noise output compared to its airflow.

It is whisper-quiet at only 23 decibels.

I hear a slight hollow buzzing sound emanating from inside the unit.

This air purifier works pretty well. During wildfire season, we had a lot of smoke in the house, which is what triggered me to buy it.

The noticeable smells reduced drastically; I don't think I smelled anything when I was downstairs.

All you need to do is pop off the front; it doesn't take much force.

I don't even turn on the ionizer because, to be honest, I couldn't tell that it was doing anything.

This is not constructed of steel at all. Really, all I feel is plastic, but it is the harder and more durable plastic that I'm used to.

Remember, though, that this thing completely detaches, so do not let it fall, or it'll get scratched very easily.

Currently, it's in the auto one position, so this is the lowest speed. It's pretty whisper quiet.

The third fan speed is, you know, quite loud, but the air coming off of it is insane.

This unit features three different filters behind the front grille.

The carbon filter inside this Winix features a plastic honeycomb design, and inside that plastic frame, there are actual carbon pellets.

It took only 20 minutes to remove all PM1 pollutants from our test room.

The Levoit Core 400S covers rooms up to 403 sq. ft.

The Levoit Core 400S was placed in a glass box filled with smoke.

We definitely like the airflow on this air purifier. It has very good airflow at 260 CFM.

Levoit air purifiers are very easy to set up and use.

The VeSync app is another exciting addition to this air purifier.

This is compatible with Alexa and Google Assistant.

The build quality is excellent; everything is in place and weighted just right.

This plastic cover, which forms the base of the air purifier when it's standing upright, is made of very thin, cheap plastic.

We are concerned about the long-term durability of that particular part in this unit.

The Core 400S features a sleep mode that produces a sound level of only 42.1 dBA.

It offers a very good noise output ratio compared to its competitors.

The air purifier is efficient at filtering out all the dust particles.

The Allen 45i is a great option for homeowners looking to purify medium-sized spaces of up to 400 square feet.

In each case, it did a great job of removing visible particles and improving the air quality in the room fairly quickly.

It's so easy to tap on it and start the entire machine.

The magnetic front panel makes it very easy to access the filter.

This is my favorite mode; it will determine how fast the fan needs to be going based on the air quality in the room.

The magnetic front panel is really nice, as it makes it very easy to access the filter.

Another nice thing about these Allen 45i's is that you can get them in different colors.

This smaller Allen unit is still bulkier than its competition.

One thing I do love about these Allens is that they're pretty quiet when they're on low speed.

In turbo mode, it is definitely a little louder.

It's a nice, smooth sound; there's no clicking or throbbing.

This is recommended for a 219 ft room; however, you can definitely use it in larger rooms.

This purifier is designed to handle a wide range of pollutants, including dust, pollen, smoke, and various odors.

You can go ahead and just throw that in the washing machine for a nice and easy clean.

It's all contained within this circle here; it's super simple and super easy to use.

It has quite a unique design.

The fabric is actually the pre-filter.

This particular air filter is definitely quieter than most.

There's also a moon setting, which is the night mode, so it's going to be super quiet.