Hello everyone,
we are building a single-family house (140 m² (1507 sq ft), KfW 70 standard) and plan to install windows with a U-value of 0.97 W/(m²·K) (glass 0.6 W/(m²·K)).
We have a relatively large window area and are wondering how much lower heating costs we can expect with better U-values.
We received a quote (about 1,500) for better insulated windows with a U-value of 0.81 W/(m²·K) (glass also 0.6 W/(m²·K)).
In your opinion, would it be worth installing the better windows?
I’m not sure when the investment pays off or if it would have a noticeable effect on heating costs at all.
I would appreciate any tips or opinions.
Lacos
we are building a single-family house (140 m² (1507 sq ft), KfW 70 standard) and plan to install windows with a U-value of 0.97 W/(m²·K) (glass 0.6 W/(m²·K)).
We have a relatively large window area and are wondering how much lower heating costs we can expect with better U-values.
We received a quote (about 1,500) for better insulated windows with a U-value of 0.81 W/(m²·K) (glass also 0.6 W/(m²·K)).
In your opinion, would it be worth installing the better windows?
I’m not sure when the investment pays off or if it would have a noticeable effect on heating costs at all.
I would appreciate any tips or opinions.
Lacos
Lacos schrieb:
....we received a quote (approx. 1,500) for better insulated windows with a U-value of 0.81 (glass also 0.6). In your opinion, would it be worthwhile to install the better windows? Who could reliably answer that, when the actual heating energy demand of the original setup isn’t even known! Focusing solely on the U-value of windows can backfire depending on location and building orientation, since a lower U-value often means a worse g-value (solar heat gain coefficient)! This can noticeably reduce the energy gains through transparent components during the predominant transition periods (partial load conditions). Best regards.
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