Premier Wholesale HVAC & Food Service Equipment Distributor

Duncan Supply has been the premier wholesale distributor of refrigeration, air conditioning, and heating equipment in central Indiana and Illinois

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Distribution Center Expansion Underway

DSC is in the process of expanding our Distribution Center to increase stocking ability. Look for the expansion to be completed summer 2017.

Branch Locations

eCommerce Online Store

Sign-up for Duncan Supply's eCommerce Online Store with over 13,000 online items in real time stock status at each branch location.

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American Air Filter

Deliver More for Less. 

Proper air filter analysis, selection & replacement are essential to operating a facility effectively and efficiently. 

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Vendor Spotlight

Events & Training

Branch Locations

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Become a Vendor

Have new innovating products that Duncan Supply Company needs to sell?  Start the process below to become a vendor of Duncan Supply Company.

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Become a Customer

Interested in becoming a customer of Duncan Supply Company?  For more information, click below to start the process.

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Featured Vendors

Just as Duncan Supply has progressed from the use of crank telephones and note pads, to cell phones and e-mail, the increasing business usages of the Internet has challenged us all to harness the technology to provide state-of-the-art services to our customers.

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