Products and Vendors

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Join Duncan Supply Today!

Join Duncan Supply Today! After 80 years Duncan Supply is still the premier HVAC/R supply house in Indiana and Eastern Illinois. Join the Duncan family and tradition of excellence at Duncan Supply.

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Our Vendors & Products

Duncan Supply Company's comprehensive $10 million inventory includes over 13,000 items in stock ready for immediate delivery. Our product lines represent relationships with more than 200 vendors and include product lines for:

  • Refrigeration
  • Heating
  • Temperature Controls
  • Boilers and Pumps 
  • Ice Machines 
  • Test Equipment  

  • Air Conditioning  
  • Accessories  
  • Air Filtration
  • Hand and Power Tools 
  • Water Treatment 
  • Pipe and Tubing 

We offer a broad array of aftermarket replacement

We have many sources for acquiring products and unusual or rarely stocked items at each of our branch locations. Tell us what you are looking for and give us the opportunity to find it for you.