Evan C. Walden, P.E., Senior Mechanical Engineer has over 43 years experience in the design and installation of mechanical systems for consulting engineering firms and for industry. Mr. Walden has expert competence in the fields of indoor air quality and HVAC; fume hoods, and materials handling systems including dust collection. Mr. Walden has presented several seminars which explore the issues of indoor air quality and ventilation for safe occupancy. Mr. Walden has served as Society chair for an ASHRAE technical committee and is past president of the ASHRAE Northeast Chapter.

John S. Edwards, P.E., LEED™ AP, Senior Mechanical Engineer  has over 30 years experience with consulting engineering firms and two top 20 Architecture/Engineering firms, with design responsibilities on projects budgeted up to $500 million. Mr. Edwards experience is in HVAC system design for commercial, industrial and institutional projects. He is a specialist in the design and troubleshooting of microprocessor-based temperature controls, and in the design of central energy plant and distribution systems.

Mr. Walden is licensed as a Professional Engineering in the following states:

Mr. Edwards is licensed as a Professional Engineering in the following states:

New York

Indiana

New York

Maine

New Jersey

Connecticut

Massachusetts

Pennsylvania

Virginia

Delaware

Maryland

Vermont