This paper discusses strategies to improve the cost efficiency of DER. In most cases a DER is started with a general refurbishment which covers all major non energy related investments and the investments to accomplish the minimum energy requirement for the building stock. The cost efficiency for any measure beyond the minimum energy requirements will be accomplished by accounting the energy savings in pay back periods of less of half of the average life cycle of the building; this might be acceptable for the public sector but will find no large acceptance in the commercial sector.
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