Change is a constant in the HVAC industry, so it’s not unusual to see standards come and go and new technologies emerge. One such change is the current phase-out of R-22 refrigerant from use in air conditioners, heat pumps, and other appliances. While many older air conditioners still use R-22, the latest models are designed to use different, non-ozone depleting refrigerants. As part of the ongoing phase-out, the U.S. Environmental Protection Agency seeks to end new production and import of R-22 and other hydrochlorofluorocarbons (HCFCs) by 2020. After 2020, HVAC technicians will only have dwindling stocks of new HCFC refrigerant and used refrigerant scavenged from non-functioning systems to rely on.