this post was submitted on 23 Mar 2025
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Sensor for furnace air filter replacement (lemmy.world)
submitted 2 weeks ago by wetling@lemmy.world to c/homeassistant@lemmy.world
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Is anyone aware of a sensor (preferably Zigbee, I think), that will give me an idea of when I need to change my furnace air filter?

I am picturing something that maybe sits on the "clean" side of the filter to measure...pressure? Air quality? I don't know.

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[–] thr0w4w4y2@sh.itjust.works 4 points 2 weeks ago (2 children)

how do you typically notice the filter needs to be changed now? does it:

  • draw more power than usual? wattage sensor
  • give some alert like a “change filter” light? esp32
  • need changing after a certain time/usage amount? power consumption sensor
  • need changing every X days? you might just need a calendar alert

of course the mega nerd approach would be to put a particulate sensor in the duct like a PMS7003 that measures PM10 particles like dust, strap on an esp32 and set some alerts using your favourite monitoring tool.

[–] wetling@lemmy.world 3 points 2 weeks ago

I read somewhere, the suggestion, that the filter be replaced when air flow has reduced by 50% from when the filter is new. IDK, that seems reasonable to me and should be measurable.

I have always replaced filters on a schedule, but it has always felt wasteful. Sometimes the filter is clearly dirty and sometimes it is not. I would like something more specific.

I will look into PMS7003.

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