Mechanical systems Service, Design, and Installations are our specialties.

Tessendorf Mechanical is Northern Illinois' leader in installing ionization sanitation systems in homes and businesses so you can rest easy knowing you are doing your part for your customers and employees to defeat the COVID-19 threat.  

Since our establishment in 1945, Tessendorf Mechanical Services has been providing our Commercial, Industrial, and Residential clients with Green Technologies, Heating, Air-Conditioning, Sheet Metal, Process Piping, Controls, Refrigeration, Ventilation, and Energy Systems design, repair, and installation.

“Challenge us with you most difficult mechanical system problem, we are confident in our abilities to solve them”

  

Servicing Northern Illinois, Northwest Indiana, and Southern Wisconsin since 1945.