I suppose you've searched the Good Shops forum on this site? I do not know of an A/C only shop, but my MB independent in West Palm services my A/C and I am always happy with their work, whatever they do. You might want to stop by and discuss your requirements and see what they say.

Eurotech German Car Repair
2354 N. Military Trail
561-686-1896

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't