[cheunste]

I been pondering about this solution for months since my air purifier died back early summer. I also have an additional idea to make it more automatic by using a raspberry pi, hooking it up to a powerswitch tail (essentially cutting power to a fan) and have it automatically turn on and off depending on time of day, etc.

[vertexFarm]

Maybe you could even use it in conjunction with something like a laser particulate sensor, to scope how effective it is and track its progress from day to day. Kick it on when it detects a nasty bunch of filth in the air, and kill it once it reaches a set acceptable level.

https://hackaday.com/2018/10/09/hacking-the-zh03b-laser-part...

This one only goes down to one micron though, so it might not be usable for many allergens.

[asdff]

Skip the pi, just grab an outlet timer from the hardware store for a couple bucks.

[io_io]

I have mine on a homekit enabled outlet ($20) for scheduling and presence-based triggers. Unfortunately I haven't found a homekit enabled air quality sensor to pair with it.

[pat2man]

Eve room? https://www.evehome.com/en/eve-room

[io_io]

Thanks! Last I checked they were no longer selling version 1 of this product and hadn't released version 2 yet. This might fit the bill.

[emmanuel_1234]

This looks great but is exclusive to Apple products (requires an iOS device)!

[m_eiman]

There’s Netatmo Home Coach.

[djmips]

Maybe you could have the input being a air quality sensor or scrape air quality from local government site / sensorup site.

[wbrasky]

instead of a raspberry pi and all that entails, might I suggest a simple outlet timer

[core-questions]

Good time of year to buy them, too, what with the christmas lights and all that. $5 ballpark.

[jjeaff]

I have seen the mechanical style ones at the dollar store. I wouldn't set my watch by it, but would be fine for this purpose.