An exact solution for small oscillatory flow Reynolds numbers is presented for the fully-developed zero-mean oscillatory flow and heat transfer in a two-dimensional channel with a wall uniformly heated to simulate the forced-convection cooling of electronic components on printed circuit boards. The other channel wall is insulated and all thermal properties are taken to be constant. Also, results are given in terms of time-averaged Nusselt number as functions of oscillatory flow Reynolds number and Wormersely number, based on both channel height and tidal displacement as the characteristic lengths, and for two specific cases with air and water as the cooling fluid media.