Home Company Profile Services Projects Contact Us Employment A.J. Demor & Sons, Inc. A.J. Demor & Sons, Inc. is a family owned mechanical contracting firm based in the Pittsburgh. PA area specializing in Plumbing, HVAC and Process Piping installations for commercial, multi-family housing, institutional and light industrial construction projects. Western Pennsylvania & West Virginia 2150 Eldo Road Monroeville, PA 15146 Tel: 412.856.5500 Fax: 412.372.5818 Central & Eastern Pennsylvania 31 Hazelton Street Ashley, Pa, 18706 Tel: 570.383.3876 Fax: 570.383.3877