Are the windows functional? (both panes)
Shade cloth outside the window (out the top and in the bottom) will
shade fairly well. It may not look great, but blocking the sun before
it enters the glass is the best option.

Is there a sill outside the window?
Perhaps a windowbox with some tall leafy plants can be made to provide
some shade.

Just brainstorming.

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May no harm befall you,
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Ich habe keine Ahnung was das bedeutet, oder vielleicht doch?
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