  The Joule-Thomson expansion process is studied for Bardeen-AdS black holes in
the extended phase space. Firstly, we get Joule-Thomson coefficient and find
that the divergent point of Joule-Thomson coefficient coincides with the zero
point of temperature. The inversion curves are also obtained from the zero
point of Joule-Thomson coefficient. Then the minimum inversion temperature and
the corresponding mass are obtained. In addition, the ratio between minimum
inversion and critical temperature for Bardeen-AdS black holes is also
calculated. We obtain the isenthalpic curve in $T$-$P$ graph and demonstrate
the cooling-heating region by the inversion curve. An interesting phenomenon we
get is that black hole is always in heating process. The same phenomenon can be
also obtained from the charged AdS black holes.
