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I'm Justin Smith, managing editor of web development for Building Operating Management magazine. Today's tip: portable cooling units in data centers. As technology advances and hardware becomes more powerful, the issue of cooling data centers continues to heat up. There's a simple logic to the situation: as facilities add more equipment, the greater the cooling needs will be. One solution is to add a portable cooling unit to your facility. These units can be permanent or temporary and generally are used where known hot spots exist in rooms where large, capital-intensive cooling solutions are not possible. Portable units can supplement existing HVAC systems and installations can be scheduled when maintenance tasks require the shutdown of the main system. In general, the units can be air- or water-cooled, capacities can range from 0.5 to 5 tons and they can be wheeled or ceiling-mounted. Costs can range from $600 to more than $12,000 per unit. So, whether for a temporary fix or a permanent addition, portable units in data centers are a cool idea.