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The original was posted on /r/homeassistant by /u/Trick-Gap7317 on 2025-07-16 23:03:30+00:00.
Hey r/homeassistant!
I just wanted to share my experience setting up my first automation. I recently bought an AirThings air quality monitor to track CO2 and VOCs in my home. I found out that CO2 spikes once my wife and I get home, and eventually approaches 1200ppm in the middle of the night.
This had me worried. I started pricing ERVs to supply my home with fresh air (they're really expensive). I even bought a fan that sits sealed in my window frame to help out, but we all know how hot it is outside.
I had a eureka moment, integrated the AirThings into my homeassistant, then realized I could set up an automation to trigger my microwave's vent fan!
Basically, when CO2 rises above 800ppm, the fan activates on low speed. I created a second to turn it back off when ppm falls below 600 for at least ten minutes.
What are some of your most useful automations you've added to your HomeAssistant setup?