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I have no clue where the $100k per classroom number came from in the parent comment(each school maybe?), A Denver based project had an installed cost of less than $800 and a yearly energy cost of $361 per classroom.

https://www.fastcompany.com/90671889/covid-19-spurred-invest...

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The $100k is one figure I saw for the whole district but looks like they got it for $20k list each for a stationary one according to this article https://www.nbc12.com/2021/09/16/manassas-public-schools-use...

Either of the models are more sophisticated than just extra fans and filters though

That's still significant, but good luck convincing the school board to do that instead of continuing to funnel money wherever they usually do instead of improving classrooms.

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