About Guenther Supply, Inc.

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About Guenther Supply, Inc.
About Guenther Supply, Inc.

Starting a small business back in the 1940's and early 1950's, Gordon Guenther, along with his brother Marvin, built walk-in coolers, refrigeration equipment, and retailed plumbing, heating, and refrigeration supplies.

In 1956, Guenther Supply was founded when Gordon Guenther and Lyle Trader ventured into the wholesale supply business, selling plumbing, heating, and refrigeration supplies, then adding petroleum-handling equipment.

In 1963, Raymond Zwicky joined the firm, providing valuable business experience to the young company. Ray served as President of Guenther Supply, Inc. from 1972 until his retirement in 1990.

Through the next few decades and into the present, Guenther Supply, Inc. grew consistently. To meet customers' needs, Guenther Supply added new product lines of pipe, valves and fittings, and related items. New facilities were put up to house the increasing inventories.

Today we have a fully integrated computer system offering real-time inventory availability. We have a busy shipping department and a fleet of delivery trucks to get our products to our customers. And we continue to grow.

Keeping pace with modern technology, we offer our customers the most innovative tools and products in the market. We have a knowledgeable full-time staff working together and dedicated to customer satisfaction.

We are proud of serving our customers for over 60 years and look forward to the future.


Our Purpose is to support our customers with unmatched service by providing a diverse and substantial inventory, timely deliveries, innovative technology, and professional assistance from a well-trained and experienced staff.

Company Directory

Guenther Supply Board of Directors
Jeff Zwicky - President
Kim Ayars - Executive Vice President
Robert G. Zwicky - Vice President/Treasurer
Karen Kraus - Vice President/Secretary 
Staff Administration
Jeff Zwicky - General Manager
Karen Kraus - Accts. Payable Manager
Kim Ayars - Accts. Receivable Manager
John Marx - Purchasing Manager
Hailey Zwicky- Purchasing Assistant
Brenda Allen - System Administrator
Outside Sales
Robert G. Zwicky - Manager
Mike Gebhardt
John Trtan
James Nett-Bin Management
Inside Sales
Michael Perry, "Mich" - Manager
Steve Wojahn
Corey Keller
MJ Shady
Linda Steffes - Sales Support Specialist

Office Staff
Kim Ayars - Office Manager
Deb Dehring
Jenny Hermanns

Warehouse Staff
Bart Christensen
Darren Weber
Troy Masteller
John Beck
Ken Warriner
David Binning
Brian Kopf
Zach Shady
Matthew Rauls