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Info about the phasing out of freon (R22), and its replacement by R410a (aka "puron"):
R-22 to R-410A - Understanding the Differences
What You Should Know about Refrigerants When Purchasing or Repairing a Residential A/C System or Heat Pump
Info about the potential phase-out of puron, and its replacement by other refrigerants:
Cooling: Rethinking Refrigerants
R-22 to R-410A - Understanding the Differences
What You Should Know about Refrigerants When Purchasing or Repairing a Residential A/C System or Heat Pump
Info about the potential phase-out of puron, and its replacement by other refrigerants:
Cooling: Rethinking Refrigerants