Frequently Asked Questions about R744

Please go over the categories below to find the answers to your questions

  • 1. What is R744?

    R744 is the chemical reference for carbon dioxide (CO2) used as refrigerant. It is a naturally occurring substance that can be applied as a working fluid in different heating and cooling applications, due to its excellent heat transfer properties and its high volumetric cooling capacity.

  • 2. Are R744 and CO2 the same thing?

    Yes. According to industry standards, each refrigerant receives a nomenclature starting with the letter R (for Refrigerant) and a number, which follows an order depending on the "family" the substance belongs to. R744 / R-744 is hence the standard nomenclature for CO2 used as a refrigerant: "7" indicates the natural fluid while "44" refers to the fluid's weight. The term R744 is applied when referred to the refrigerant itself, and CO2, and/ or CO2 Technology is used when referring to an application or use.

  • 3. What are the main characteristics of R744?

    R744 is:
    • Non-toxic
    • Non-flammable
    • Non-ozone-depleting
    • Environmentally friendly, with a Global Warming Potential = 1
    A more detailed explanation of each of these features follows below.

  • 4. Why is R744 environmentally friendly?

    Applying R744 in vapour compression applications reduces significantly the amount of greenhouse gas (GHG) emissions released into the atmosphere, which is at the origin of climate change. Besides, R744 systems, in many applications, have the potential to be more efficient than current systems in most climate conditions, and therefore indirect emissions of GHG resulting from energy consumption are also reduced.

    For example: Given that, on average, Mobile Air Conditioning (MAC) is activated about 60% of the time a car is in use over its lifetime, the choice of the low global warming refrigerant R744 is a key element for improving the environmental performance of a car. For other applications, such as heat pump water heating or commercial refrigeration, the potential for emission reduction by using R744 is also significant.

    For more details see the section Environment under Mobile Air Conditioning.

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