This paper deals with the heat transfer effect on the flow of Herschel Bulkley fluid moving in a non-uniform channel under peristalsis. The channel wall is being considered to be coated with a porous lining. Mathematical analysis is done for the temperature profile, rate of temperature, heat transfer coefficient and mechanical efficiency, with the suppositions of long wave length and small Reynolds number. The numerical results and graphs are obtained for all the above mentioned analytical solutions, through Mathematica software.  The effects of the pertinent parameters are analysed through the graphical illustrations. The results show that there is decrease in the temperature profile, heat transfer coefficient and the rate of temperature with increase in the Darcy number. Also as the porous coating of the channel wall is thickened there is rise in the temperature profile and the rate measure of temperature. The mechanical efficiency is seen to be more in a convergent channel than in uniform and divergent channels.