Hello,
We are currently building to KfW 70 standards, and triple-glazed windows with a U-value of 0.9 are standard for us. I have read several times that there are, of course, better windows available, for example with a U-value of 0.6.
We have many windows in our house, especially large façades facing south and west. All windows can be shaded, but that's just a side note.
I am wondering now if this makes a significant difference in terms of energy loss in winter and solar gain in summer when opting for slightly better windows, even if it might mean paying an additional cost.
Is it possible to quantify this? Or is it negligible?
What are your thoughts?
We are currently building to KfW 70 standards, and triple-glazed windows with a U-value of 0.9 are standard for us. I have read several times that there are, of course, better windows available, for example with a U-value of 0.6.
We have many windows in our house, especially large façades facing south and west. All windows can be shaded, but that's just a side note.
I am wondering now if this makes a significant difference in terms of energy loss in winter and solar gain in summer when opting for slightly better windows, even if it might mean paying an additional cost.
Is it possible to quantify this? Or is it negligible?
What are your thoughts?
Even though I can’t arrive at your 2160 Wh figure after 10 minutes of calculation, the additional €39 per year for gas costs due to windows with a U-value of 0.9 instead of 0.7 sounds realistic.
Basically, insulation always costs about as much as you can save over the typical lifespan phase.
Basically, insulation always costs about as much as you can save over the typical lifespan phase.
K
KrustyDerClown1 Jul 2016 20:31I need better windows to achieve KfW55 standards. Currently, my heat calculation is based on 0.9 windows.
Does anyone know how to calculate the additional cost for improving from 0.9 to 0.8 (per square meter)?
Best regards,
Oliver
Does anyone know how to calculate the additional cost for improving from 0.9 to 0.8 (per square meter)?
Best regards,
Oliver
I would assume that this is highly individual... on evofenster, for example, a window measuring 900x1230mm (35x48 inches) with a Uf value of 0.87 W/m²K and a Ug value of 1.1 W/m²K results in an overall value of about 1.0, while the same Uf of 0.87 combined with a Ug of 0.7 gives an overall value of about 0.8 – the price difference is around 5%.
K
KrustyDerClown3 Jul 2016 22:09Do you happen to have a price in euros as well? Unfortunately, I have no idea about the cost of windows.
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