Clean up downstairs. Clear raised-floor passages of cabling or other obstructions to airflow.

Go to 208v. Upgrade to more efficient 208-volt, three-phase power, if you haven't already. The higher voltage requires a lower current, which reduces losses. The small savings of 1 percent or 2 percent add up in a large data center.

Coordinate cooling. In data centers with high-density heat loads, consider hiring a professional to measure airflows and correct air conditioning problems. Simply adding more air conditioning doesn't always help.

Sources: Robert Frances Group; ILM; Insight64