This article presents an optimized prediction model of building dynamic HVAC system load. which simplifies the input parameters of the model while meeting the accuracy requirements of the prediction results. The model was established using the open-source Modelica-based building library. and the linear aggregation method was used to establish the model. https://safeersappliancers.shop/product-category/belling-farmhouse60df-free-standing-a-a-dual-fuel-cooker-with-gas-hob-60cm/