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Industry Resources

CO2 Transcritical Refrigeration—Specializing in R744 Refrigerant

CO2 Refrigeration—Just the Facts

Ammonia will always have a place in the world of Industrial Refrigeration. No doubt, it's been the "go to" refrigerant for many decades. But things are changing quickly. With the rapid technological advancements in CO2 configurations and design, one should no longer consider ammonia as the only "best choice" refrigerant available.

  • More and more end users are asking for CO2 as an alternate to ammonia than ever before.
  • High efficient adiabatic gas coolers help keep the outdoor air temperature below transcritical temperatures. Adiabatic gas coolers use 90% less water than conventional cooling towers, weigh significantly less and require no chemical treatment or water testing, spray water basins or pumps.
  • No water is needed in climates where standard gas coolers can be used.
  • There are no PSM costs associated with CO2
  • The GWP of CO2 is 1 and its safety classification rating is A1.
  • Due to CO2's high pressure, suction lines are half the size of ammonia.
  • In most cases, long runs can easily be achieved using the same size tube due to the higher pressures and insignificant pressure drops associated with CO2.
  • Liquid and suction lines can easily and safely be installed inside the building due to the smaller line sizes and CO2's A1 classification. In addition, standard Armaflex insulation can be used to further reduce material and installation costs.
  • A CO2 floating head pressure design can float the head to 50 F. This greatly reduces the compression ratio which improves performance and efficiencies.
  • Heat reclaim benefits of CO2 are exceptional. A well-designed CO2 system can supply hot gas defrost, dehumidification, and air and water heating while increasing system performance.
  • Construction costs can be reduced by eliminating a mechanical room and installing the equipment either outside in an enclosure or on a mezzanine with a relatively small footprint.
  • CO2 requires no refrigerant liquid pumps, refrigerant dehydration, diffusion tanks or distillation systems.
  • A well-designed CO2 skid can come complete with controls, valves, and vessels all mounted and wired.


With the constant changes in EPA regulations and OSHA safety requirements, CO2 is becoming the best choice for industrial refrigeration applications. With a low GWP, A1 classification and its energy efficient capabilities, it is the "triple threat" of refrigerants. CO2 is here to stay and growing every day in popularity. Choose CO2 as your next refrigerant of choice.