R-22 is the common name for hydro-chlorofluorocarbon (HCFC). R-22 has been used as a refrigerant by HVAC manufacturers for over 40 years, but studies in the past decade have shown that HCFCs contain chlorine, an ozone-depleting agent. For this reason, the United States Clean Air Act has set the target date for January 1, 2010, on which HVAC manufacturers must cease the production of products that use R-22.  Here is a quote from the us epa on the phase out of R-22…

January 1, 2020:The Montreal Protocol requires the U.S. to reduce its consumption of HCFCs by 99.5% below the U.S. baseline. Refrigerant that has been recovered and recycled/reclaimed will be allowed beyond 2020 to service existing systems, but chemical manufacturers will no longer be able to produce R-22 to service existing air conditioners and heat pumps.

http://www.epa.gov/ozone/title6/phaseout/22phaseout.html

All equipment we install now is r-410a based. Contact us for a free estimate.