Bistability of the electrical resistance in free-standing (La0.7Sr0.3)MnO3 conducting microbridges under Joule self-heating conditions is reported and modeled by Finite Element Analysis. We show that a low (LRS) and a high (HRS) resistance state can be selected below room temperature, where the typical non-linearity of ρ(T) relationship of manganites determines multiple thermal equilibrium conditions. We analyze bistability in microbridges in terms of temperature and heat dissipation conditions. Thanks to the small thermal coupling of the suspended geometry, switching between LRS/HRS can be driven with small amount of power (∼250 μW). Finally, temporal evolution of the transition between the LRS and HRS is discussed in the framework of the heating dynamics.