The impact of microclimate conditions on energy demand is investigated through various coupling schemes between a zonal microclimatic tool and an urban building energy simulation software for a canyon settlement. Additionally, the impact of split air condition units on ambient air temperatures is examined for an annual period. The numerical calculations for a mild oceanic climate confirm the necessity of integrating the microclimate conditions in building energy performance simulations. Air conditioning units have a significant impact on air temperature both for cooling and heating period. Furthermore, discrepancies emerging from online and offline coupling schemes are highlighted.