Most commercial refrigerants are given an "R" number. For example the once-popular Freon-12 is called R12, although this particular substance has been banned since about 1994 under the Montreal Protocol because it is very damaging to the ozone layer.
The Sanyo units use Carbon Dioxide, or CO2, as the refrigerant. For reasons that Google failed to reveal, it is also known as R744.
The R744.com website tells you pretty much everything you want to know about using R744 for heating and cooling.
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