Low frequency noise in a-SixGey:H thermo-sensing films, on glass and in micro-bolometers of planar and sandwich structures based on the same material has been studied at different temperatures. The noise spectra had the form of the 1/f-like noise with the frequency exponent within the range of 0.8 to 1.6 depending on the sample and temperature. In the temperature range from T = 340 to 400 K the amplitude of the noise and current (at constant voltage) increased. These dependences can be described as a thermal activated process with energies of EaS/I = 0.63 eV and Eafilm = 0.34 eV for relative spectral noise density of the current fluctuations and DC current, respectively.