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Josko - Fenster und Tueren
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1. When insulating the façade should I also replace the windows and vice versa?

Absolutely.

If you only insulate the façade and keep the old windows, the weakest point in the house remains uninsulated (the loss of heat from a house through the windows is up to 30%!), there is a much lower energy saving effect and heat continues to be lost through the façade.

If you replace only the windows the condensation – which would otherwise form on the poorly insulated window – is deposited on the cool wall. This can result in the formation of mould harmful to health if there is insufficient ventilation.


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