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As is the case for many people, my home cannot be retrofitted with central air. My 100-plus-year-old Brooklyn apartment, which features prominently in my seven years of air quality reporting for WIRED , relies on window air conditioning units to keep cool on our warming planet. While there is the obvious paradox that air conditioners are players in climate change, AC units are evolving with more environmentally safe refrigerants, eco modes, smart apps, modern design, and energy-efficient consumption.

That is to say, while I prefer to keep my AC units turned off, on hot days, my top-floor

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