About Us

Our History

Committed to excellence for over 47 years

In 1969, Albert J. Izzo started two companies in one day. Zonatherm Products was founded to focus on the sale of mission-critical products. The complementary vision for ThermFlo, Inc. was to provide exceptional service for products sold by Zonatherm.

Al Izzo and Ralph Liebert 1972
Our founder, Al Izzo (on the right), with Liebert's founder, Ralph Liebert. 1972

From the beginning, ThermFlo has also marketed its capabilities in engineering, piping and sheet metal work. This menu of construction-related services planted the seed for the growth of our highly successful Projects Division.

One of ThermFlo’s first customers in 1969 was Allstate Insurance Company, and Allstate remains a customer to this day. This is just one example of the commitment Al Izzo established from day one, to grow by building long-term partnerships, and always doing what’s best for the customer.

1977 was a crucial year in terms of pointing the way for the company’s future. In that year, Al’s son Stephen Izzo, along with Kevin O’Brien and Jeff Sode began their careers at ThermFlo. Today, these three dynamic individuals form our executive leadership team.

Stephen Izzo
Stephen Izzo
Jeff Sode
Jeff Sode
Kevin O'Brien
Kevin O'Brien

From the 1980’s on, our Service Division and Projects Division have both grown at a steady pace. While ThermFlo has always serviced products for a variety of leading industry brands, key milestones were achieved when we became the exclusive factory-authorized service representative for Liebert thermal management products and Generac commercial and industrial power systems in Chicago, Northern Illinois and Northwest Indiana.

Strong relationships with customers and our manufacturer partners have driven ThermFlo’s success. Equally important, however, are the open communications and nurturing relationships that thrive within the company. ThermFlo is a family-owned company with a culture based on friendship, loyalty and a commitment to excellence established by Al Izzo, and which is shared by all our employees.

What sets thermflo apart?

The 360° difference, for your peace of mind

When it comes to mission-critical thermal management and standby power systems, you have lots of choices. We'd like to convince you that ThermFlo, Inc. is your best choice.

Zonatherm Products

Our sister company, Zonatherm Products, Inc., is the exclusive authorized distributor in this area for the sale of Liebert thermal management products and Generac commercial and industrial power systems.

Exclusive Authorized Service Reps

ThermFlo's primary business is service. Our Service Division's technicians work on all brands of HVAC units and generators, and we are proud to be the exclusive factory-authorized service representative for Liebert thermal management products and Generac commercial and industrial power systems in Chicago, Northern Illinois and Northwest Indiana.

Concept to Completion

Our Projects Division is a "concept to completion" resource for engineering, design and installation. We will partner with you from the inception of a project all the way through final construction for both Electrical and HVAC equipment.

With ThermFlo, you can choose to partner with any of our three parts individually, or take advantage of the integrated whole. We call it the ThermFlo 360° Difference, because no other company can take you “full circle,” from initial consultation and purchase, through the comprehensive design/build process, through preventive maintenance and emergency service for the life of your equipment.

We call it the ThermFlo 360° Difference. No other company can take you “full circle”, from initial consultation and purchase, through the comprehensive design/build process, through maintenance and service for the life of your equipment.

memberships & affiliations

Generac
EGSA
MCA
Member