====== Building energy performance ======

The energy performance of a building (or building efficiency) is expressed in kWh/m<sup>2</sup>. This metric represents the annual average heating demand per unit of inhabited surface. The lower this value; the higher the efficiency of the building (irrespective of its size). In 2011 the Swiss building stock consumed an average of 92 kWh/m2 <sup>[[#References|[1]]]</sup>.

The values for the annual average heating demand are taken from the three scenarios presented in PROGNOS 2012 <sup>[[#References|[1]]]</sup> and they define the max and min values for the [[building_efficiency_more|building efficiency slider]].

^  Annual average heating demand [kWh/m2]  ^^^
^Scenarios ^2035 ^2050 ^
|New energy policies |41 |21 |
|Political measures of the Federal Council |49.5 |33 |
|Business as usual |57 |43 |

Each scenario has a series of assumptions, as mentioned previously, one is the rate of refurbishment for buildings depending on their age.

^  Buildings constructed before 2011 that will had been refurbished by 2035 or 2050  [%]  ^^^
^Scenarios ^2035 ^2050 ^
|New energy policies |54 |87 |
|Political measures of the Federal Council |Not available in the report||
|Business as usual |36 |53 |

The efficiencies of refurbished/new buildings is also scenario dependent.

^  Maximum heating demand for new and refurbished buildings in 2035 and 2050* [W/m2]  ^^^^^
^Scenarios ^New ^^Refurbished ^^
^::: ^2035 ^2050 ^2035 ^2050 ^
|New energy policies |6.6 |6.3 |9.9 |9.4 |
|Political measures of the Federal Council |6.7 |6.6 |12.7 |10.9 |
|Business as usual |14.7 |12.5 |22.1 |18.8 |

The reader will find more information about assumptions and parameters for the different scenarios in the chapters 7.4.1.1; 8.4.1.1 and 9.4.1.1 of PROGNOS 2012 <sup>[[#References|[1]]]</sup>.

===== References =====
[1] [[http://www.bfe.admin.ch/php/modules/publikationen/stream.php?extlang=de&name=de_564869151.pdf&endung=Die%20Energieperspektiven%20f%FCr%20die%20Schweiz%20bis%202050|PROGNOS 2012, Die Energieperspektiven für die Schweiz bis 2050, Energienachfrage und Elektrizitätsangebot in der Schweiz 2000–2050.]]