CALL (763) 478-6504

- Commercial HVAC Service/Installation
- Industrial HVAC Service/Installation
- Refrigeration Service/Installation
- Chiller Service/Installation

  • 42 Years of Experience in This Field
  • Refrigerant/Reclamation/Recovery Certified
  • Award Winning Certified Welder
  • Licensed/Insured/Bonded

Equipment Serviced


Contact Us:

If you need immediate service, call answering center and leave info with person and we will get back to you within one hour. 763-478-6504.


Serving all areas within two hours drive time from Minneapolis, MN.

Phone: 763-478-6504



Chiller Technology Services, Inc was founded by Ernie Duffney in 1987 specializing in commercial, industrial HVAC, chiller and refrigeration services. Master licensed, insured and bonded. Also refrigerant, reclamation and recovery certified. He personally started the Carrier chillers for the first air-conditioned stadium (Metrodome in Minneapolis) as a Carrier technician in the 10 years prior.

Featured Services

  • Service/Installation/Replacement of All Equipment as Listed Under Equipment Serviced
  • Chiller Replacement (up to 1,000 tons.) Water Cooled/Air Cooled
  • Packaged Rooftop Heating/Cooling Unit Replacement (up to 100 tons)
  • Services On Call 24/7/365 -- (763) 478-6504
  • Service/Maintenance Contracts
  • Refrigerant Removal/Recovery/Reclamation
  • Non-Destructive Eddy Current Tube Testing
  • Oil Sampling/Lab Analysis

Photo Gallery


  • Packaged Rooftop Heating/Cooling Units
  • Centrifugal Chillers (Water Cooled & Air Cooled)
  • Reciprocating Compressors/Chillers
  • Screw Compressors/Chillers
  • Absorption Chillers
  • Air Handler Units
  • Large Magnesium Blowers/Air Movers
  • Exhaust Units/Blowers
  • Air Cooled Condensors/Dry Coolers
  • Condensing Units
  • Refrigeration (Walk-In Coolers/Freezers Systems)
  • Cooling Towers
  • Water Pumps—Condensor Water, Chilled Water, Booster, Re-circulating and Hot Water
  • Water Filters/Strainers
  • Water Cooled Condensors/Evaporators - Brush Cleaning, Acid Cleaning, Tube Leak Testing & Plugging
  • Condensor Water Storage Tanks
  • Heat Exchangers—Tube in Shell/Plate to Plate
  • Glycol Water Systems
  • 3-Way Valves/Butterfly Valves
  • Coils—Chilled Water/Hot Water/Steam
  • Expansion Tanks
  • Small Boilers
  • Heat Pumps
  • Make-Up Air Units
  • Unit Heaters/Gas Fired/Hot Water/Steam
  • Electric Duct Heaters
  • Gas Fired Overhead Tube Heaters
  • Pneumatic Air Compressors
  • Air Dryer Systems
  • Chemical Feed Systems
  • Shaft Alignment