By Le Chatelier's principle, increasing the temperature will shift the equilibrium to the left, as it is an exothermic reaction and producing heat is an indication of a forward reaction. Therefore, shifting the equilibrium to the right would require decreasing the temperature. Thus, if we increase the temperature, the shift in equilibrium will be leftward, and if we decrease the temperature, the shift in equilibrium will be rightward. So the answer is shift equilibrium left.
