In this paper, the thermoelastic problem of a semi-infinite microstretch homogeneous isotropic body is investigated in the context of different theories of generalized thermoelasticity. The surface of the semi-infinite body is subjected to a zonal time-dependent heat shock. The problem is solved by using a finite element method. The results, regarding temperature, stresses, displacements, microrotation, and microstretch, are presented graphically. Comparisons are made among the results derived from different generalized thermoelastic theories to show that the micropolar effect has a slight influence on the results while the microstretch effect has a great influence.