Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

R-438A FYI

Here is some information regarding another new generation refrigerant that is available for R-22 replacement. R-438A is a blend of R-32, R-125, R-134a, R-600 and R-601a. This refrigerant blend has the same component refrigerants as R-407C, but two pure hydrocarbons, butane (R-600) and isopentane (R-601a) have been added in small quantities. The main benefit of this refrigerant is that it can be used in conjunction with the mineral oils that are presently used in conjunction with R-22. The presence of the hydrocarbons in R-438A facilitates oil return to the compressor by reducing the viscosity, or thickness, of the oil. R-438A is an HFC blend, so its ODP is zero. The operating pressures of R-438A are similar to those of R-22, but its capacity is slightly lower than that of R-22.

You can check out Dupont's website for more information.


  • John Mills_5
    John Mills_5 Member Posts: 935
    Would you say

    that this stuff is better, worse or about the same as NU22b for residential systems? 
This discussion has been closed.