Questions about Dyson HP09 Hot+Cool Formaldehyde

TwentyTwoCarats on 05/09/2023 - 15:26

Hi All,

I'm thinking of getting the Dyson HP09 Hot+Cool Formaldehyde, I have a few questions - any help is appreciated. My main purpose is air purification since I have high allergy reactions (sneezing and blocked nose) to dust, pollen, animal dander, etc. And also I have gas cooktop and gas ducted heating so those are probably spreading bad pollutants around. The heating and cooling is a nice add on too especially due to the high price tag.

  1. Is it relatively easy to move around and do you just lift it by the big ring? E.g. I'll have it in my study room when working from home, in the bedroom while sleeping and in the living area when watching TV. I have a small house so the distances are not big at all - my total floor space is \~100sqm. Also I'm aware that it is 5.5kg.
  2. Can it purify against all the pollutants while heating? Because I read a post where someone said it didn't. Secondly can it purify while cooling?
  3. What is the way to leave it on all night to purify the air - if I don't care about any temperature change such as cooling and heating. In winter my place is 12-15 degrees Celsius without any heating, and I am fine to sleep in that temperature. I just want purification on an "auto" mode. Is this possible and if not, what is the best way to do this thing?
  4. My bedroom gets super dusty and I always find clumps of dust behind the bed, under the bed, around my chest of drawers. Of course I would try my best to regularly clean it, but would the Dyson HP09 operate well in a dusty room like this? Sorry if it's a silly question.
  5. If I primarily need air purification, is it better that I just buy a dedicated air purifier and if so, do you have any suggestions? How is this HP09's purification performance compared to a dedicated purifier?

Thank you in advance :)

EDIT:

I did my own research and found that the Samsung AX90 probably is a better dedicated purifier with a higher CADR rating - although Dyson doesn't publish CADR their purifiers have been tested and they are kind of low. However - because I have a small house where my bedrooms would be max 10.8 m2 and my living area would be 30-35 m2 max, it is probably small enough to warrant a Dyson. And also I would use it for heating too, which means less use of the ducted gas heating!

Thoughts?

Electrical & Electronics Air Purifier Dyson Fan Heater

Comments

  • rumblytangara on 05/09/2023 - 15:49
    +3

    I've said this before on this forum: The Dyson idea for air purification is total garbage.

    Think about it. For air to be purified, ALL of the air coming out of the machine should go through the HEPA filter, right? If air bypasses the filter, it is not purified.

    Dyson's own marketing says that 15x more air is just sucked through the circular opening. This means that only 1/16th of the air goes through the mechanical fan blades in the base of the device, where the HEPA filter sits. So a whopping 6% of air that is blown by the fan is purified.

    https://4.bp.blogspot.com/-iqZhJS1F76M/T0aFfUyG3pI/AAAAAAAAI…

    It's just a totally inappropriate, shoehorned solution to sell more fans.

    Want an air purifier? Then buy an proper air purifier, not some piece of overpriced marketing crap that pretends to be one. Get the one with the biggest filter you can find. These things are all just fans that blow air through a HEPA filter, there is no whizz bang technomagic behind them.

    Your question about dust: That's what pre-filters are for, to take out coarse dust before it hits the HEPA filter. Doesn't look like the Dyson design uses them either. Air purifiers don't do much about dust as it falls out of the air so quickly anyway, but the pre-filters will still clog up with dust.

    • rumblytangara on 05/09/2023 - 18:49

      I just checked the price on that Dyson model. Over a grand.

      What is this, some kind of tax on the credulous? That's insane, for a such a sub-optimally designed appliance.

      My big air purifier cost around that, and it was made in Switzerland, not off some Chinese production line. With filters probably about five times the mass, of the Dyson and proper air seals- I've tested it and it's literally 100% effective for PM2.5, not the 5% effective that the Dyson will be.

      • TwentyTwoCarats on 05/09/2023 - 23:18

        What do you have? Could you please share

        • rumblytangara on 05/09/2023 - 23:47

          IQAir 250.

          It's the opposite of Dyson- big, ugly, and effective. Giant filters, over a kilo of activated carbon. Also have Xiaomis for bedrooms.

  • tharlow on 05/09/2023 - 16:02
    +2

    It’s not widely known, but thousands of innocent Australians are killed every year from the cumulative effects of formaldehyde. (I read that somewhere.) So please don’t settle for any air purifier that doesn’t guarantee to neutralise this most insidious of indoor pollutants. And don’t trust anybody that uses double negatives.

    Now on to your five questions — yes, yes, yes, yes. Oh… and no

  • Richardc on 05/09/2023 - 16:33
    +1

    I would just get a xiaomi air purifier.

  • jocogi on 05/09/2023 - 17:23

    Yeah the Xiaomi are still the favourite budget filter here amongst most people. I own 3x 3H units (They use a HEPA filter which is the regarded as the highest quality). The replacement filters do seem to have got a bit harder to find on sale, but the whole setup is still relatively cheap compared to other brands. The next generation 4H model has an ozone generation option which is regarded as a flaw because ozone is bad for your health and while it can be switched off, it may default back on without you realising. The 3H are also cheaper. Auto functions based on air quality are universally crap because the sensors need to be thousands of dollars to actually be accurate. I just run my units as high as I can tolerate the noise because that guarantees the highest turnover of air.

    To be honest, I hate the idea of heating or cooling integrated into a filter unit. Why combine functions when a reverse cycle wall unit will be more efficient than any electric element or gas burner anyway? Get rid of the gas heater as soon as you can for heating because it's also not as efficient as a reverse cycle wall unit for heating. Gas is a complete scam these days and has health dangers as you've mentioned.

    • rumblytangara on 05/09/2023 - 17:59
      +1

      That's not a bad idea, but it takes a lot of space.

      OP could try cheap DIY first to see if purification really helps with allergies. I have made much simpler variants before, and tested them.

      https://smartairfilters.com/en/blog/how-to-make-diy-air-puri…
      https://smartairfilters.com/en/blog/cannon/

      Beats spending $800 on a Samsung which may not do anything for him.

      I would not spend that much on one of those Samsungs anyway. I have spent more than that on a single purifier, but it was made to a significantly better spec than some disposable Samsung rubbish.

      • tharlow on 05/09/2023 - 18:27
        +1

        disposable Samsung rubbish

        Interestingly, I read that as indispensable Samsung ruggedness. The first time, before realising my mistake, that is. I assume I must be suffering from temporarily unhealthy levels of environmental pollutants

  • tharlow on 05/09/2023 - 22:37

    They have since renamed the app to MyDyson, but here is an example of the technical wizardry that lurks inside a Dyson Purifier. Or maybe it’s in the cloud — I really have no idea

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