Mechanical problems with a water treatment plant in Hawaii have left thousands of soldiers without central air conditioning in the barracks, a spokesman for U.S. Army Garrison Hawaii confirmed Tuesday in a statement to Military Times.

Four thousand soldiers in Area North Barracks are opening windows, turning on fans or using other tools to beat the heat while the base grapples with pump issues.

On July 10, deep-well pumps supporting Army installations in central and northern Oahu started experiencing problems.

According to the garrison, only one pump is currently pushing water to the surface. To maintain essential water services, water chiller systems have been turned off. Without the chiller systems — which make up almost 40% of the daily water use — the barracks do not receive central air conditioning. The incident was initially reported by Task & Purpose.

According to the National Weather Service, temperatures for the remainder of the week range from the mid-70s to the upper-80s.

Units are able to move troops to MWR facilities with central air conditioning, according to the service, but as of Sunday, no units had done so.

Repairs are underway, but an exact timeline for when the pumps will be fully functional again was not provided.

The cause of the issues has not been definitively identified, however “age and extreme heat due to ventilation system repairs are believed to be part of the cause,” said Nathan Wilkes, the garrison’s external communications chief.

The installation is prioritizing keeping safe drinking water available.

Barracks and residential housing have access to drinkable water, and plumbing and sanitation systems are operational. Wilkes also said the installation has paused irrigation systems pulling from Area North water supply.

Family housing still has air conditioning and water access, Wilkes added.

The garrison’s commander, Col. Rachel Sullivan, was scheduled to host a town hall on the installation’s Facebook page on Tuesday.