  Based on the Einstein-Maxwell theory, the Joule-Thomson (J-T) expansion of
charged dilatonic black holes (the solutions are neither flat nor AdS) in
$(n+1)$-dimensional spacetime is studied herein. To this end, we analyze the
effects of the dimension $n$ and dilaton field $\alpha$ on J-T expansion. An
explicit expression for the J-T coefficient is derived, and consequently, a
negative heat capacity is found to lead to a cooling process. In contrast to
its effect on the dimension, the inversion curve decreases with charge $Q$ at
low pressures, whereas the opposite effect is observed at high pressures. We
can observe that with an increase in the dimension $n$ or parameter $\alpha$,
both the pressure cut-off point and the minimum inversion temperature $T_{min}$
change. Moreover, we analyze the ratio $T_{min}/T_{c}$ numerically and discover
that the ratio is independent of charge; however, it depends on the dilaton
field and dimension: for $n=3$ and $\alpha=0$, the ratio is 1/2. The dilaton
field is found to enhance the ratio. In addition, we identify the
cooling-heating regions by investigating the inversion and isenthalpic curves,
and the behavior of the minimum inversion mass $M_{min}$ indicates that this
cooling-heating transition may not occur under certain special conditions.
