A method comprises determining a poly-gate temperature for a given device and determining channel temperatures of monitor devices. The method further includes extrapolating channel temperatures of the monitor devices to obtain a channel temperature for the given device. The difference in temperature (ΔT value) is determined for the given device based on the poly-gate temperature and the channel temperature. A device comprises a heating device having a poly gate with at least one contact at each end thereof and a plurality of monitor device spaced at known distances from the heating device