EMCOR Group recently purchased Mechanical Services of Central Florida (MSI), a mechanical services firm based in Orlando, Fla. Terms of the transaction were not disclosed. MSI employs nearly 350 technical and service personnel, and provides various mechanical services - 24-hour mobile response and preventative maintenance, on-site building operations and maintenance services, plumbing construction and retrofit services. 2008 revenues are expected to be about $48 million.