Gas phase chiral molecules
The molecule has to be small. trans-1,2-difluorocyclopropane is certainly chiral, and its predicted boiling point is ~ 5 deg C.  trans-1,1,2,3-tetrafluorocyclopropane is another likely candidate.  This one will be easier to prepare (from perfluoropropylene oxide and trans-1,2-difluoroethylene).

Separation of enantiomers is the hard part.