  The local electron temperature distribution is calculated considering a two
dimensional electron system in the integer quantum Hall regime in presence of
disorder and uniform perpendicular magnetic fields. We solve
thermal-hydrodynamical equations to obtain the spatial distribution of the
local electron temperature in the linear-response regime. It is observed that,
the variations of electron temperature exhibit an antisymmetry regarding the
center of the sample in accordance with the location of incompressible strips.
To understand the effect of sample mobility on the local electron temperature
we impose a disorder potential calculated within the screening theory. Here,
long range potential fluctuations are assumed to simulate cumulative disorder
potential depending on the impurity atoms. We observe that the local electron
temperature strongly depends on the number of impurities in narrow samples.
