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Not sure what city you live in but in the big cities I’ve lived in it was always easy to get the level down to 500ppm by opening windows.

Yeah I live in Chicago and it is not hard to keep it at 450ppm. Right now it’s 493ppm in here.

What are you using to measure this?

(I'm sure I could do my own research, but was more curious since it seems like you've already got a setup.)

I mean that’s really low. If it’s cold outside you’re probable just wasting energy keeping your spaces warm with so much ventilation, making the problem worse in the process.

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