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Data centers face escalating electricity consumption and heat management challenges, driving the exploration of cooling methods. Traditional air-based systems like air conditioners and chillers coexist with innovative solutions like adiabatic cooling, water cooling, heat exchangers, and even underwater data centers. Free cooling stands out as an eco-friendly and cost-saving approach, yet industry dynamics and logistical considerations hinder its universal adoption, despite being favored by tech giants like Facebook and Google.