5 to 15 litres per day of intensive use for a typical residential appliance, or 300 to 900 litres over a 60-day season. That is less than one person's daily shower (60 to 100 L/day). The water cost remains marginal (€2 to €4 per season). In commercial premises, industrial evaporative units use more but remain far below the energy cost avoided compared with refrigerant-based air conditioning. The same evaporative cooling principle explains AI data centres' water consumption.
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