Welcome to

Duncan supply company inc.

Since inception in 1936, Duncan Supply Company has taken pride in delivering the highest quality and best value to our customers. This philosophy has helped us grow into an industry leader, distributing a wide range of refrigeration, air conditioning, heating equipment, and accessories to customers, throughout central Indiana and Illinois.

Branch Locations

View a map of our branches

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.

Start the process

Become a Customer

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

Start the process

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.

Warm weather is on the way! Make sure your A/C system runs all season long with Nu-Calgon products!

iOS App Now Available