I’ve changed mine once after 4 years of moderate use in a quite well insulated 1700 sqft apartment with wood floors, no carpets but a decent amount of visitors and occasional tiny dog.
Those filters were used though, no idea for how long (they only had like 70 hours on them according to the onboard tracking, but that would be easy to manipulate even by accident)
IQair recommends a yearly replacement for my HEPA filter, but my environment had a fairly low amount of particulates to begin with (new building with filtered air intakes) and workload split between multiple units.
Speaking of expensive air purifiers, you can often find excellent deals on used IQair units. I got 4 GC Multigas units from a local museum for 100 euros each.
I have an alert set up on the local craigslist equivalent and constantly get emails.
> it seems like Kindle has better sideloading support now.
For books? Hasn’t Kindle always had amazing sideloading support? I think even over a decade ago you could just email your pirated books to a kindle.com email address to have them automagically show up on the kindle.
I took this even further, put air purifiers in most rooms and hooked them up to air quality sensors.
Mostly they run on the very quiet setting (or not at all), but they’ll automatically spin up if someone cooks, farts, opens a window or hits a vape pen.
Those filters were used though, no idea for how long (they only had like 70 hours on them according to the onboard tracking, but that would be easy to manipulate even by accident)
This essentially tracks with the numbers presented here https://www.iqair.com/newsroom/why-you-need-to-replace-your-...
IQair recommends a yearly replacement for my HEPA filter, but my environment had a fairly low amount of particulates to begin with (new building with filtered air intakes) and workload split between multiple units.