The Commercial Interiors Reference Guide states zero use of CFC based refrigerants. For this project, heat pump PTAC\'s are being used for heating and cooling to achieve the required high efficiencies. The heat pump PTAC\'s are currently only available with R-22 refrigerant. Per the Reference Guide table 1, page 142, R-22 is an HCFC (not CFC) with a relatively low lifetime, low ODP, and low GWP. The Reference Guide (under Approach and Implementation page 142)states the previously mentioned values should all be short/low, which they are according to the table. That requirement appears to be met with R-22. Is R-22 (HCFC-22) an approved refrigerant for EA Prerequisite 3?