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AC Retrofits: An Opportunity for Contractors

AC Retrofits: An Opportunity for Contractors

R-22 Retrofits During Service Calls

As the R-22 phaseout continues, use the service call as an opportunity to serve your customers by an AC retrofit—converting their R-22 equipment to Freon™ MO99 refrigerant, a more sustainable, non-ozone-depleting replacement.

During a service call, an AC retrofit for a condensing unit, commercial, rooftop, or residential system is an opportunity to grow your bottom line. An AC retrofit is a valuable service to your customers, particularly for:

  • Systems with little or no refrigerant charge
  • Systems requiring replacement of a component
  • Environmentally focused customers with a desire for non-ozone-depleting refrigerants
  • Customers who would prefer an AC retrofit rather than an entire system replacement
  • Systems with lines buried in walls/floors that cannot be converted to R-410A
  • Customers unable to afford a new R-410A system in the current economy

What do these scenarios have in common? They are all opportunities for an AC retrofit from R-22 to Freon™ MO99, the non-ozone-depleting, mineral oil compatible R-22, alternative from Chemours.

A Quick and Non-Disruptive Change

  • No oil change required; Freon™ MO99 is compatible with mineral oil, AB, and POE
  • No cutting out of compressors to dump oil
  • No TXV or line set changes 
  • Pressure and temperatures closely match R-22
  • After making required repairs and changing seals and filter driers, simply evacuate and charge with Freon™ MO99

Benefits for Equipment Owners

  • Freon™ MO99 is a non-ozone-depleting and more sustainable solution
  • Retrofitting to Freon™ MO99 now eliminates exposure to possible R-22 supply issues
  • Helps avoid potential R-22 price volatility
  • Eliminates risks for HCFC leak reporting/fines  
  • Extends useful life of equipment
  • Avoids additional service call for an AC retrofit

When the system is down and the refrigerant charge is removed is the ideal opportunity to explain the clear benefits of converting your customer away from R-22.

Note: Please consult and follow the Freon™ MO99 retrofit guidelines for detailed step-by-step instructions for your AC retrofit.

Freon™ MO99

Freon™ MO99 is a versatile R-22 replacement refrigerant for replacing R-22 in direct expansion (DX) air conditioning and refrigeration systems that can be easily used in an AC retrofit.

Freon™ MO99 has been specifically formulated to combine R-22 pressure-enthalpy characteristics with mineral oil compatibility in a unique refrigerant that can be used to replace R-22 over a wide range of evaporator temperatures. Freon™ MO99 is compatible with MO/AB/POE lubricants; in most cases, no change of lubricant type is required during the AC retrofit.


  • Commercial air conditioning
  • Rooftop units
  • Indoor packaged units
  • DX chillers
  • Split systems
  • Residential air conditioning
  • Refrigeration (low- and medium-temperature)
  • Self-contained systems
  • Condensing units
  • Rack systems


  • Lower retrofit labor costs versus HFC/POE options
  • Eliminates costly and disruptive oil changes
  • Compatible with AB, MO, and POE lubricants
  • No expansion valve or line set changes
  • Minimizes time spent on control set point adjustments and subsequent service calls
  • Not subject to phaseout under the Montreal Protocol
  • 42% lower global warming potential (GWP) than R-404A (ref. AR4 report)
  • After the AC retrofit, can be topped off during service without removing the entire charge

Expected Performance After Retrofit

Based on field experience, calorimeter testing, and thermodynamic property data, Freon™ MO99 provides similar cooling capacity and energy efficiency versus R-22 in most systems, while operating at a lower compressor discharge temperature. Actual performance depends on system design and operating conditions.

Please read and follow the Freon™ MO99 retrofit guidelines.