This report provides a detailed analysis of two building simulation tools, IES and BersPro, focusing on their key characteristics, potential uses, and target users. IES, a software for energy analysis, is used to assess building performance, identify passive solutions, and compare carbon emissions, crucial for achieving energy efficiency and sustainability in the construction sector. The report highlights its use in achieving CO2 emission reductions and supporting design teams. BersPro, on the other hand, is a tool for simulating and analyzing the thermal performance of houses, particularly in Australia's diverse climates. It aids in assigning star ratings and provides graphical and written data on building thermal conditions. The report critiques both tools, outlining their strengths and limitations, and emphasizing their roles in optimizing energy consumption, improving environmental impact, and enhancing the decision-making processes of various professionals in the construction industry.