Maintenance, repair, and installation services in the field of HVAC systems, namely piping and refrigeration systems; Maintenance, repair, and installation services in the field of plumbing; Maintenance, repair, and installation of electrical systems; Maintenance, repair, and installation of data network systems, telephone systems, audio systems, visual systems, life safety systems, power over Ethernet lighting systems, structured cabling systems, distributed antenna systems, wireless internet systems, data center integration systems, and security, access and intrusion alarm systems
Building Construction and Repair