r404 is a blend of r134a, HFC-143A, HFC-125... for the record
straight r134a does not look as promising... at least not at those pressures...
i may be wrong, but i'm pretty sure R134a is typically used at much lower pressures.
the saturation temperature (aka the temperature that it becomes a vapor... aka boiling) at 174psi is about 47*C. at say 27psi, it has a saturation teof 0*C