Auschick, this may be of interest to you!
It states it the R44 P.O.H, as an operating limitation, that the R44 (Raven 1 at least) cannot be operated in conditions of ISA + 23', now i know florida and california etc... may well be in these conditions alot of the time, and the helis are made and tested in cali..
But i'm just putting it out there!
Peace!