In response to the break-ins, windows in Hinton James, Craige, Morrison and Ehringhaus residence halls were sealed with bolts earlier this week, officials said.
Because the burglars entered through windows with air conditioning units in them, all windows with the units have been screwed shut.
"All windows on the balcony sides of the buildings with air conditioning units were bolted," said Rebecca Casey, assistant director of the Department of Housing.
Before the changes, the units obstructed the windows and prevented them from fully locking, Casey said.
Mark McIntyre, captain of investigations with University police, said eight rooms in Craige and Hinton James were burglarized during the four-day break.
"We don't have any suspects yet, but we are following some leads," McIntyre said.
According to an e-mail sent to South Campus residents by Jennifer Lewitas, the area director at Ehringhaus, screws were installed on the top of windows so that they could not be opened from the outside.
Screws were inserted on the outside of the window and two more were inserted from the inside.
Casey said windows with AC units were not bolted prior to the break-ins so that residents could open their windows.