Welcome to Our World.

Keep Your Equipment Running Efficiently.

DePue Mechanical has served the Illinois Valley, Joliet and Chicagoland areas since 1964, providing HVAC service to large and small commercial customers, from a small mom and pop shop to large commercial projects. Our maintenance contracts give you peace of mind, knowing that your HVAC equipment is being kept in tip top condition by the most skilled HVAC technicians in the Midwest. Every DePue technician keeps up-to-date with the latest certifications to provide solutions to your HVAC concerns quickly and correctly.

Call us for any HVAC need, large or small.

  • 24/7 Emergency Service
  • Sheet Metal Services
  • Commercial & Industrial Refrigeration
  • Air Handling Equipment
  • Temperature Controls
  • Humidification and Dehumidification Systems
  • Design/Build Engineering
  • Commissioning/Retro-Commissioning
  • Boilers
  • Chillers
  • Compressor Replacements
  • Computer Room Systems


HVAC Maintenance Program

BUILDINGS Magazine said, "A strong HVAC maintenance program isn’t an option; it’s a must."

An unexpected equipment breakdown will unquestionably cost you more than a maintenance program that prevents devastating financial losses from equipment replacement or, worse yet, a building shut down. DePue keeps your HVAC equipment operating at peak efficiency, providing building inhabitants or workers with an environment that’s healthy and comfortable, while lowering your total energy bills and extending the life of your HVAC system.

Call DePue for information about all of our Preventive Maintenance Programs:

  • Full Coverage Maintenance Programs
  • Extended Warranty Programs
  • Hourly or Yearly Programs

HVAC Chicago Area

HVAC Project Gallery: