Dyson Purifier Hot+Cool Formaldehyde review: A smart fan for all seasons

It’s a bold move to put ‘Formaldehyde’ in a product title – especially when it follows ‘Hot+Cool’, suggesting there are two conditions of formaldehyde it might pump out at you.

Of course, it doesn’t: thanks to the word ‘Purifier’ also in the name, you can rest assured that this is about removing formaldehyde rather than slowly pickling you in it.

There’s a similar model – the Dyson HEPA Purifier Cool Formaldehyde – that gives a similar impression, but, again, it’s not jetting cold formaldehyde at you, it’s cleaning the air.

As with any top-of-the-range Dyson model, the price here is much loftier than your typical fan. So, is it worth the extra outlay? We’ve been testing it in order to find out.
The Dyson Purifier Hot+Cool Formaldehyde offers a multitude of air treatments – and the performance is outstanding.

There’s an instant appeal in the full spectrum of hot and cold functions, as well as those purification options, but just whether you need these all features will depend on your circumstances.

With a full range of options – and a full range of prices – there are devices lower down the scale that will give you much of the core experience and features (cooling and air filtration) at lower prices.
Although we tend to call them fans (in the UK, at least), Dyson’s ‘air treatment’ products have now moved well beyond the cooling draft provided by a fan. That leads to some of the comedic names that try to spell out the functions of that device.

For this particular model, we have purification – a HEPA H13 filter system – that also detects and destroys formaldehyde, heating and cooling. Generally speaking, the more functions you get, the more you’re likely to pay.
The design is now iconic, as easily recognisable as Dyson’s vacuum cleaners, and certainly reaching that premium state of desirability. Everyone has a tower fan, but, if you’ve got a Dyson fan, there’s something a little more elegant sitting in the corner of the room.

That characteristic design comprises the base, which houses the motor, and, in the case of purifying models, the filters that feed into the oval head, which is bladeless. That’s one of the attractive things about Dyson’s air devices – there are no moving parts on the exterior to stick your fingers into.

This model offers a tilting base, too, so you can angle it up or down slightly, as well as oscillation, which, in typical Dyson fashion is smooth and quiet, escaping the creaks you find from many oscillating fans.
The head is double-sided, allowing air to be blown out the front or indirectly moved out of the back of the device, while there’s also a display on the front that will show you a status graph that relates to the air purifying skills that the fan offers.

There’s a remote control, as well, which attaches to the top of the fan magnetically. As you would expect this allows a range of controls, while others are offered in the Dyson Link app. The remote will sit firmly in place, but it’s easily knocked off and easily lost, with replacements (thankfully) available to buy.

We should also say that the finish is fairly easily scratched, and, over time, it will start to look a little worn.


Ajmal Solangi is a Tech writer specializing in the intersection of tech and reviews. He likes tech news, mobile unboxing, reviews, gadgets, and more.

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