Facilities Management does not have an estimate for when hot water and heat will be restored, according to an email Tuesday.
The union that represents the housekeepers is "cautiously optimistic" that the situation will be resolved soon.
The union that represents UMD workers remains unsatisfied.
The union that represents workers on campus says it has heard from several employees who have sought medical attention after working without air conditioning.
The outage occurred early Wednesday morning.
The 10-day outage is scheduled to stretch over the Thanksgiving holiday.
The outage occurred on Sept. 30.
Why was so little done when UMD buildings lost air conditioning?
The heat index in one dorm hit 101 degrees on Sept. 12.
It uses low-grade heat.