Is your air conditioner bringing in dirty outside air?

Is your air conditioner bringing in dirty outside air? Here’s a live test with a particle counter. See the average results over multiple AC tests here.
Thomas Talhelm

Thomas is an Associate Professor of Behavior Science at the University of Chicago Booth School of Business and the founder of Smart Air, a social enterprise to help people in China breathe clean air without shelling out thousands of dollars for expensive purifiers.

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