I sleep with a fan blowing to move the air in my bedroom.

Over the years I’ve had all sorts of fans, but for the last few years, my choice has been a Dyson fan sitting on a small table.

The Dyson fan I’ve been using was the Pure Hot+Cool. The Pure meant it had a HEPA filter, and Hot+Cool means it’s a heater as well as a fan. I loved that the HEPA filter meant I was cleaning the air in the bedroom as I was being lulled to sleep by the cool breezes.

Earlier this year, Dyson asked if I wanted to review the latest version, the Dyson Purifier Hot+Cool Formaldehyde ($849.99, Dyson.com), which is quite a mouthful. It has a model number of HP09, so let’s call it that for this review.

What is it?

The HP09 is a beautiful machine, it is silver, gold and white.

If you are not familiar with Dyson fans, they are cylindrical at the bottom, where the air is drawn in and passed through a filter before being forced out through the oval-shaped exhaust at the top. So, when the fan is taking in air, that air is being filtered.

When I had non-filtering fans in the past, I’d turn those off when I was not in bed, but now I leave the Dyson on all day.

The HP09 has integrated sensors to analyze the air, displaying the live results on its LCD screen.

The HP09 has an app that lets the user run an air quality report showing the monthly average of your room’s air quality index. The air quality report will also show you the day with the highest average pollution and list the dominant pollutants and their exact levels.

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