  We analyze a one dimensional quantum model with off-diagonal disorder,
consisting of a sequence of potential energy barriers whose width is a random
variable either uniformly or normally distributed. We investigate how the
disorder and the energy distribution (due to a thermostat at room temperature)
affect the resulting value of the transmission coefficient, and discuss the
structure of the fluctuations of such coefficient at different length scales
and the onset of different size-dependent regimes. Our analysis suggests an
efficient way to detect tunneling resonances in a regime of off-diagonal
disorder.
