URMC / Highland Hospital / Facilities / Blog / May 2017 May 2017 Replacing an air handling unit on the roof of the Emergency Department Starting on May 30 through mid-July, Highland Hospital will be replacing an air handling unit on the roof of the Emergency Department on the hospital’s south side. The existing unit is more than 40 years old and needs to be replaced. This will involve the use of a crane, trucks and some metal-cutting noise as the old unit will need to be dismantled in pieces in order to be removed.