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The building simulation tool Domus has been recently renamed as PowerDomus for whole-building hygrothermal and energy simulation. Enhancements have been accomplished by improving the features for input and output data applied to multizone buildings, by adding HVAC systems and plants, by adding attics among other Graphical User Interface (GUI) features and by improving the numerical algorithms for calculating Sun angles, shading projections and moisture prediction through composite walls using moisture content as driving potential. In addition, the interface has been considerably improved so that simulations can be rapidly performed and the Sun kinematics and shadows from overhangs and adjacent buildings can be easily visualized using an OpenGL based interface. To conclude, simulations are performed for the TRY weather data of Curitiba, Brazil, comparing the results when time step and grid refinement are altered. Moreover, moisture effects by adding a building envelope coating and energy efficiency analysis are presented for two room air conditioner models.