this post was submitted on 23 Mar 2025
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Sensor for furnace air filter replacement (lemmy.world)
submitted 1 week 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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[–] wetling@lemmy.world 3 points 1 week 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.