Customer Testimonials

Naperville, Illinois and Merrillville, Indiana

CIS' Staff did a wonderful job working with my GC. The HVAC work was not only a quality job,but on time and at the agreed price. Looking forward to building more properties with CIS.

Libertyville Illinois

I can always count on CIS to do the job right every time. Thank you!

Chicago, Illinois

I have worked with CIS on many projects, both simple and very complicated. They are always on time and are very considerate to other contractors at my sites. I only choose one HVAC contractor and it is always CIS.

DesPlaines, Illinois

I have worked with many different HVAC companies trying to get my ventilation equipment working properly. Finally I found CIS. One service call and it work and still works perfectly. Thank you CIS!

Lombard and Chicago Illinois

CIS continues to handle all of our work because they understand the requirements of building project of these sizes.  Ira Katz runs his company exactly how I would run my own business...customer satisfaction is priority!

Buffalo Grove - Deerfield - Schaumburg, Illinois

I really enjoy working with CIS' team. They are truly concerned that my facilities HVAC equipment is running optimally. Even after a repair, CIS' staff calls me to make sure that everything is working correctly. They care unlike other companies that we have dealt with over many many years in business. I always suggest CIS whenever a friend or client asks for a great HVAC company.

Hammond, Indiana

Thank you Comfort Indoor Solutions for being there for me when I needed you most. My boiler is finally running well and more important continuously. Great job to their staff. I should have call you last year.