I was reading this report prepared by PNNL which says (page 16): "Using refrigerant to deliver heating and cooling requires less energy because of the larger heat capacity of the refrigerant relative to air and even water. Less mass flow is needed to deliver the same amount of heating or cooling." http://www.gsa.gov/portal/mediaId/169771/fileName/GPG_VRF_Report_-_FINAL_DRAFT_4-16-13 Is this really true? I see for Chlorodifluoromethane (R22) a latent heat of vaporization of 233 kJ/kg. How is that more heat capacity than water?