The Dyson Pure Cool TP04 HEPA Filter Air Purifier and Tower Fan is both an air purifier and a fan, and it loses no quality in either capacity for merging the two functions.
We have an air purifier upstairs, on the main floor, and in our basement, and I have tested several more units over the past few years, and one thing every air purifier I have used shares in common is a mild airflow output. They move plenty of air, but the current is gentle; it's not going to create enough circulation to cool a room, but that's not the point anyway. On the other hand, a good tower fan moves lots of air and makes a room feel cooler and fresher, but is not in fact making the air cleaner. Again, not the fan's job, so no issue.
You see where this is going, so let's get to it: Unlike with so many devices that merge functions and in so doing sacrifice efficacy, the Dyson Pure Cool TP04 HEPA Filter Air Purifier and Tower Fan performs perfectly well as a purifying device as well as a fan. Its HEPA filter captures particulate matter down to the level of 0.3 microns, trapping 99.97% of allergens, mold spores, dust, and more. And when you connect the TP04 to your Wi-Fi and pair it with an app, you can get regular reports of your indoor air quality and you can program operation schedules and control the device remotely.
As a fan, the TP04 is equally as capable. At its high setting, the fan moves 77 gallons of air per second, and thanks to Dyson's proprietary "Air Multiplier" hardware, the air current is smooth and without buffeting. With its almost unrivaled 350-degree oscillation range, it can move air around even in cavernous rooms when set in the middle of the area to be covered.
So what's the problem with this generally excellent device? Primarily the price. You could buy every other fan on this list and still not come close to the price tag of the TP04. Then again, if you bought a top-quality tower fan and a top-quality air purifier as separate units, you'd be getting close.
One customer speaks for many when he says the TP04 is "one of the best things [he] ever purchased," adding "your lungs will thank you!" Another says the "iOS app is great" and loves that she can "control all functions from the app."
Beyond the price, one common complaint was the noise; above the fourth or fifth speed setting, this fan/purifier is quite loud.
A writer with The-Gadgeteer said that "the bottom line is that the Dyson TP04 will trap a lot of bad stuff before it gets into your lungs," noting that it "has been certified asthma and allergy friendly by the Asthma and Allergy Foundation of America."
Pros: Excellent air purification, wide oscillation range, moves high volume of air, works with an app
Cons: Very expensive, noisy whining at high settings