ParaSol is a user-friendly energy simulation tool for comparison of energy demand, and peak loads for heating / cooling for different glazing and shading devices. The program is intended for use by students, researchers, architects and energy consultants. ParaSol is developed for MS Windows operating systems 2000/XP. The Swedish and English languages can easily be set in a program menu. The program be can used to design and renovate buildings such as offices, schools and dwellings.