Water coolers across the nation use about 4 billion kilowatt-hours of energy every year. And although we don’t necessarily advocate drinking bottled water, if you’re going to do it at least do it efficiently. In this Huddle, you’ll find water coolers that meet Energy Star criteria. That means cold only and cook-and-cold bottled units must use less than 0.16 kW-hours per day and hot and cold bottled units must use less than 1.20 kW-hours/day.