R.J. Olmen Company

Ventilation Contractors Since 1972

Your Trusted HVAC Contracting Professionals


Welcome to R. J. Olmen Company

40-years copy


During the Post WWII Industrial Boom, Ronald J. Olmen began his career as a Sheet Metal Worker, employed by his Uncle, Philip Olmen; Partner at Jamar-Olmen Company. Jamar-Olmen was one of the Nation's largest Commercial/Industrial HVAC firms. After working his way to Vice President of the company, Ron's succession from Jamar-Olmen, led him to follow his dream; The American Dream of Business Ownership. In April of 1972, on little more than a wing and a prayer, Ron and his wife Patricia Olmen, founded R. J. Olmen Company, building it entirely upon hard work, integrity, quality and trust.


Today, in it's 4th generation, R. J. Olmen Company continues this tradition and maintains a strong and trusted presence in all of its Ventilation Contracting alliances.

R. J. Olmen Company has been providing HVAC throughout the Chicago-land area for over 40 years. Some of our customers include:


Chicago Public Schools

City of Chicago

Cook Lake & DuPage County

Federal Government Agencies


Dyalysis Treatment Centers

Suburban Municipal Offices

Suburban School Districts

Higher Education - Northeastern Illinois, UIC, University of Chicago

U S Dept of Navy

U S Dept of Veteran's Affairs

Private Entities