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--- basics:affordability:investing_in_energy_efficiency:are_passive_houses_cost-effective [2019/02/21 10:15] – [What will all this cost?] cblagojevic
+++ basics:affordability:investing_in_energy_efficiency:are_passive_houses_cost-effective [2022/04/04 16:24] (current) – [Remark about the boundary conditions in 2015:] wfeist
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 This page was last updated at the end of April 2006. Prices for energy, interest rates and the requirements for incentives may change very quickly. However, such changes only have a small influence on the core statement ("yellow table") Why?
-  * The economic viability of building measures that are taken is determined not so much by the current market as it is by the average economical constraints for the duration of usage of a building, (which is more than 30 years).
+  * The economic viability of building measures that are taken is determined not so much by the current market as it is by the average economical constraints for the duration of usage of a building (which is more than 30 years).
   * "Much can happen" during this period. But: Today it is possible for the building constructor to have the interest rate conditions fixed at a comparatively low level for the next twenty or thirty years. It is rather unlikely that energy will become cheaper on average in the next few decades than it is now. The most important parameters are relatively certain, even if current fluctuations occur from time to time which give a different impression.
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   * Even lower real interest rates. That is an effect of a lot of capital being available on the market - and the frustration resulting from the bubbles in the past. This is not going to change soon: so 2% real interest rate is more probable to be the future boundary condition.
-But, what changed much more, are the extra investment costs of building a passive house now, in 2015: Triple pane glazings do now have already more than 70% market penetration and have dropped in price significantly. Also the Passive house windows are much less expensive since 2014 - and the same will become true for the ventilation systems. So, it's no longer 14000 €, it's less than 9500 € you need in addition to build a well working passive house (140 m²). And that difference changes the picture in a dramatic way (see figure ): In 2015 building a new residential building, and not building a passive house - that is just foolish from an economic point of view.
+But, what changed much more, are the extra investment costs of building a passive house now, in 2015: Triple pane glazings do now have already more than 70% market penetration and have dropped in price significantly. Also the Passive house windows are much less expensive since 2014 - and the same will become true for the ventilation systems. So, it's no longer 14000 €, it's less than 9500 € you need in addition to build a well working passive house (140 m²). And that difference changes the picture in a dramatic way (see figure 7): In 2015 building a new residential building, and not building a passive house - that is just foolish from an economic point of view.
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