MSI Engineers - Your source for the right solution Meulink Stauffenberg, Inc. has provided professional mechanical engineering design services for over 13 years throughout the Pacific Northwest and abroad. MSI offers comprehensive expertise for your heating, ventilation, air conditioning, plumbing, fire protection, and site service system projects. This includes new construction, modernizations, renovations, and expansion projects for commercial, industrial, residential, educational, and government facilities, within both the private and public sectors. MSI Engineers also provides consulting services focused on optimizing building energy performance, including energy life-cycle cost analysis, advanced building energy simulation, LEED certification support, and energy code compliance.