We have been using the SF-2 from 3M since freons were banned years back.
The vapor temperature of the SF-2 is lower than the freon but shouldn't
cause problems if you have adequate preheat.  It also takes somewhat cooler
coils to maintain it.


Wm. Dean May
NSWC Crane
Bldg. 38, Code 8086
300 Highway 361
Crane, IN 47522
812-854-3073

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