  We analyze experimental data obtained from an electrical circuit having
components at different temperatures, showing how to predict its response to
temperature variations. This illustrates in detail how to utilize a recent
linear response theory for nonequilibrium overdamped stochastic systems. To
validate these results, we introduce a reweighting procedure that mimics the
actual realization of the perturbation and allows extracting the susceptibility
of the system from steady state data. This procedure is closely related to
other fluctuation-response relations based on the knowledge of the steady state
probability distribution. As an example, we show that the nonequilibrium heat
capacity in general does not correspond to the correlation between the energy
of the system and the heat flowing into it. Rather, also non-dissipative
aspects are relevant in the nonequilbrium fluctuation response relations.
