GAO reviewed military housing operations and maintenance. The objective of the review was to determine what the Department of Defense's (DOD) present policy is on air-conditioning military family housing in Hawaii. Specifically, GAO set out to determine whether the Services identify the need for central air-conditioning in their family housing in Hawaii and whether savings were possible from eliminating unnecessary central air-conditioning in existing family housing units. While DOD has changed its requirements to consider the need for air-conditioning on a case-by-case basis, GAO found that unnecessary central air-conditioning is still used in some family housing in Hawaii. Disconnecting and removing these unneeded air-conditioners could produce substantial long-term savings. Initial estimated net savings of $623,000 could be realized in the first year by removing unneeded units. Future year savings will rapidly approach $1 million annually.