About Us

H2MG, LLC (H2MG) is a minority-owned mechanical, electrical, and plumbing engineering design firm located in San Antonio, Texas. Established in 2009, H2MG professionals have over 30 years of design experience and extraordinary engineering talent. H2MG takes pride in our reputation as a progressive and innovative firm that utilizes the latest hardware and software technology, design procedures, and engineering design tools, including Revit. Included in our innovative approach are many sustainable design options to help Owners achieve significant cost savings while reducing environmental impact. We approach every project with rigorous quality control processes to ensure a high quality engineering product. At H2MG, we are committed to engineering exceptional environments. H2MG, LLC is registered with the State of Texas as a Historically Underutilized Business and certified HABE MBE SBE with South Central Texas Regional Certification Agency.

Ernesto Lopez del Castillo, Jr., PE


William E. Harris, Jr., PE