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Energy Auditing and Certification of Buildings

In most countries there is a significant potential for increased energy efficiency in buildings like schools, hospitals, kindergartens, offices, apartment buildings, etc. The energy costs normally constitute a substantial part of the budgets.
To reduce the energy consumption and costs, and to improve the indoor environment, it is necessary to renovate and implement energy efficiency measures in the buildings. To identify the actual potential and ensure sustainable results, projects should be developed and implemented in a structured and efficient way. This requires good Energy Auditing and Project Management methods and tools, as well as good skills of specialists. Energy Auditing is also needed to assess and present the energy performance of a building in an Energy Certificate. 

Target group

This programme is applicable wherever there is a demand for increased knowledge, capacities and skills on Energy Auditing and Certification among authorities, organisations, managers, consultants, engineers, experts as well as university professors, teachers and students.


To ensure efficient capacity building, the interactive "learning by doing" approach is also in the Energy Auditing programmes. A sustainable development is further secured by “training of trainers”, building local capacities and skills enabling the "trainers" to continue and further develop by themselves.

What is Energy Auditing?

Energy Auditing includes an inspection of the building, and an evaluation and analysis of the existing situation and the various measures that could be implemented to reduce the energy consumption and improve the indoor environment. The results are presented in an Energy Audit Report describing the recommended measures with corresponding investments, savings and profit. Findings and results of the energy auditing are also used to prepare the Energy Certificate, according to international and national guidelines and requirements. Energy Auditing should be done by a specially trained and experienced energy auditor.

Multidisciplinary Energy Audit

When performing an Energy Audit, all the factors influencing the energy consumption and the indoor environment must be evaluated:

  • Building envelope (walls, windows, roofs and floors)
  • Heating system
  • Mechanical ventilation system
  • Domestic hot water system
  • Automatic control systems
  • Lighting
  • Various installations like kitchen, laundry, etc.
  • Air-conditioning system

In addition, it is also necessary to take into consideration how the building and its installations actually are being operated and used (often not as designed).

The energy efficiency improvement potential (EE Potential)

An important output from the Energy Auditing is the unique potential for energy efficiency improvements presented in the following way, ranking the recommended measures according to their profitability (NPVQ):


EE Potential - Energy Audit



Investment Net Savings  Payback NPVQ
kWh/year €/year year r = 7 %
1. Energy efficient showers 400  2.300  200  2  2,51

2. Operation & maintenance manuals/

    Energy management system

15.000  81.000  7.100  2,1  2,32
3. Sealing of windows 10.000  80.000  8.000  1,3  2,28
4. Insulation of attic floor 12.500  17.800  1.800  6,9  0,79

5. Insulation of pipes, valves, etc.

9.500  17.700  1.800  5,3  0,73

6. Balancing of heating system and 

    thermostatic valves

22.500  53.800 5.400   4,2 0,69
7. Heat recovery, vent. system 25.000  37.000  3.200  7,8  0,17
8. Automatic control system 20.000  38.000  3.300  6,1  0,16
Total all measures 114.900  327.600  30.800  3,7  


The complete Energy Audit Report should normally include the following main content:

  • Summary
  • Project organisation (involved parties)
  • Description of the existing situation
  • Present energy consumption
  • Identified EE Potential
  • Description of the recommended EE measures
  • Environment benefits/improvements
  • Implementation plan
  • Financing plan
  • Description of proposed Operation & Maintenance and Energy Monitoring routines

ENSI Toolbox

In addition to the ENSI Software for energy and profitability calculations, the provided ENSI Toolbox on on "Energy Auditing and Certification of Building" includes manuals covering all the steps of the project development process and several templates (inspection checklist, etc.), examples and exercises.


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