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Begin with the renovation and insulation of the building shell. The numbers at the right will immediately reflect the effect of individual measures. The energy index changes due to renovation of the building shell and changes in ventilation (under HVAC).

CO2 emissions and energy consumption also change with your measures.

With each measure, the improvement is reflected as a percentage. This improvement reflects all measures so far in relation to the original condition.

The cost/benefit ratio assesses the economy of the measures you selected. The cost/benefit ratio is based on the data that you entered for your building.

In any case thermal insulation has priority over replacing the heating system. This also applies for a real-world renovation project.

All computations were made on the basis of the data you entered and the approximation formulas in the program. The results provide only rough reference values and are not reliable. Details regarding economy and costs must be acquired via personal energy consulting.