It truly is a fantastic purifier fan, but it will cost you an arm and a leg.

We’ve updated the price section of this review to reflect that.

Like its name suggests, it is big and it is quiet.

Dyson Purifier Big+Quiet Formaldehyde standing in a corner

(Image credit: Sharmishta Sarkar / TechRadar)

Dyson has adopted cone aerodynamics to more than double the Coanda effect the brand uses in its other purifiers.

I found the CO2 sensor very useful as you could never tell if your home needs ventilating or not.

This model will set you back $1,099 / AU$1,599 (around 830).

The bowl or cone of the Dyson Purifier Big+Quiet Formaldehyde

Big and bulky were the words that occurred to me.

Then the Dyson engineer moved the machine… gently, with one finger.

They dont move as well over carpet, though, and thats when the Big+Quiet really feels bulky.

The bowl of the Dyson Purifier Big+Quiet Formaldehyde on the floor beside its cylinder

(Image credit: Sharmishta Sarkar / TechRadar)

You simply adjust the bowl over the cylinder till it clicks into place.

It looks heavy, but its not and can easily be lifted.

Below the display is a small power button its black on black and barely visible.

Dyson Purifier Big+Quiet Formaldehyde fully dismantled to reveal the two filters

(Image credit: Sharmishta Sarkar / TechRadar)

A small unperforated strip on the cylinder is where the machines tiny remote attaches magnetically.

Im guessing its going to be nigh on impossible to move over a high-pile carpet or rug.

But how many of us really plop our purifiers in the middle of a room?

The remote control sticking magnetically to the Dyson Purifier Big+Quiet Formaldehyde

The air can be projected in three different angles 0o or parallel to the floor, 25o and 50o.

The Big+Quiets main function, however, is air purification.

Filtration here is the same three-step system weve seen from Dysonsbest air purifiers, but with significant improvements.

Dyson Purifier Big+Quiet Formaldehyde iOS app screenshots

you’re free to also get graphical representations of what the machine is filtering.

However, you’re able to only get a per-day look.

If theres nothing for it to do, it will idle but not switch off.

The screen on the Dyson Purifier Big+Quiet Formaldehyde displaying a metric

What I really like is how quiet it is.

The smaller machines sound is also higher pitched in comparison to the big one, making it harsher.

Performance score:4.5 / 5

Should I buy the Dyson Purifier Big+Quiet Formaldehyde?

Dyson Purifier Big+Quiet Formaldehyde iOS app screenshots

The Big+Quiet takes care of that problem.

If youd rather get an all-in-one gadget for all seasons, youll need to look elsewhere.

However, it wont do as well in a large space as the Big+Quiet.

Display on the Dyson Purifier Big+Quiet Formaldehyde

(Image credit: Sharmishta Sarkar / TechRadar)

you’re free to read our in-depthDyson Purifier Big+Quiet Formaldehyde (HP09) reviewto know more.

This is also a multifunctional purifier that can cool and heat as well, and its quiet too.

This purifier, however, isnt available in all markets.

Breeze mode displayed on the Dyson Purifier Big+Quiet Formaldehyde

(Image credit: Sharmishta Sarkar / TechRadar)

If youre in Australia, perhaps the Breville The AirRounder Plus Connect could be a good alternative.

I tested all three Breeze modes and also left it in Auto mode to see how it would perform.

I also had it running while I was cooking to see if the metrics changed.

The small remote control of the Dyson Purifier Big+Quiet Formaldehyde

I also compared the sound level to the Breville The AirRounder Plus Connect.

Read we test

[First reviewed October 2023]

The toggle switch to remove the bowl of the Dyson Purifier Big+Quiet Formaldehyde

(Image credit: Sharmishta Sarkar / TechRadar)

Clip inside the cylinder of the Dyson Purifier Big+Quiet Formaldehyde

(Image credit: Sharmishta Sarkar / TechRadar)

Dyson Purifier Big+Quiet Formaldehyde standing beside a bookshelf

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