Energy efficient modernisation

Old heating, minimal insulation, windows and doors that let in draught. Still, millions of buildings in Germany are real energy wasters. Given this situation, modernisation in respect of energy efficiency may reduce energy consumption by more than two thirds.

With a share of 75 percent, space heating in buildings accounts for the major part of the energy costs. Accordingly, it makes sense to start with the subject of heating when planning renovation measures. Complete modernisation to improve energy efficiency comprises a bundle of measures. At the building shell, the roof, outer walls and the basement ceiling can be insulated with suitable materials.

Exchanging heating systems adds up quickly

Modern windows with triple glazing, a heating system tailored to the heat requirements, optimised flow temperatures, energy-efficient pumps, insulation of pipes and the hydraulic balancing of the heating systems also result in considerable saving. At the moment, the renovation rate in Germany, and also in Berlin, is about one percent. Billions will have to be invested to increase that rate and in this way achieve the energy efficiency and climate protection goals for buildings. Insulation of the building shell yields the greatest savings but is also the measure that requires the most capital and in most cases will pay off only after 20 years.

The exchange of old boilers, also in connection with mini-CHP units (small combined heat and power units), solar panels or heat pumps will yield a profit much sooner. Expert knowledge is required already when modernising a single-family or two-family house to ensure that the investment will be refinanced through energy cost savings as quickly as possible. In larger buildings, a comprehensive energy requirement analysis is necessary and afterwards a complex energy management system which can only be installed with the knowledge of a proven expert.