Who We Are

With roots dating back to 1907, South Side Control Supply Co. has built a reputation as the most knowledgeable and responsive supplier in the HVAC business, providing solutions to our customer’s toughest HVAC/R control problems.

Southside Control Supply

A Leading Controls Distributor

Headquartered in Chicago with eleven locations, we are a leading controls distributor with the vast majority of our business in the commercial market with our primary customer base being mechanical contractors.

We also take outstanding care of our employees, many of whom have spent their entire career at South Side Control Supply Co.


  • We provide solutions to our customer’s toughest HVAC/R control problems
  • Our knowledgeable salesforce includes those with 40+ years of HVAC/R industry experience
  • Responsive customer service
  • Unmatched inventory
  • Longstanding vendor relationships
  • Eleven convenient locations
  • Dedicated engineering department
  • Twenty-four hour / 365 days a year after hours service


Jensen Electric Co. was founded in 1907 by Victor Jensen, a 22 year old Danish immigrant.

South Side Electric Supply Co. was established in the 1940s so that Victor, an electrician, could purchase copper during World War II.

Victor’s youngest son Norton, an engineer, joined in the late 1950s. Norton expanded the business into HVAC controls, which were relatively new at the time, in the 1960s.

Norton took interest in a new technology made by Honeywell called Series 90. The 135 ohm resistance based system provided modulating control without the need for a pneumatic system. Although its popularity has declined, Series 90 is still being used in buildings today.

South Side Control Supply Co. moved (there was only one branch!) from 5910 South Halstead Street to our current location at 488 North Milwaukee Avenue in 1969.

Eric, Norton’s son, joined the Company in 1995.