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I live in the second floor (one over ground level) in a condo building in Germany. It is rented, so I cannot do major modifications. Minor modifications must be arranged with the owner. The living room has a huge window to the south-east. Now in the summer there is a lot of sunshine through that window, the living room gets quite warm and sticky this way.

This summer some plant that has grown wildly in front of the building has made its way in front of my window:

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I quite liked it, it looks like I am living in a tree house. Also this plant absorbed the sunlight and made the living room way more enjoyable over the day.

Sadly the facility management had to take it down as this tree-like plant scraped against the facade. Soon they want to paint the facade as well, the tree would be in their way.

Now we have a clear view on the other buildings and a lot of sun in the living room again:

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Only the first floor (ground level) flats have outside roller shutters, the higher ones do not have them. We only have curtains but that absorb the sunlight within the room and do not cause much improvement. Also the tree was nice to look at, closed curtains look somewhat sad.

I have thought about sticking some sort of tint foil onto the lower part of the window or covering it completely. Also there is mirror foil available on the internet which will reflect some of the sunlight directly. However, I fear that on rainy days, the living room will be quite dark, then.

What could I do to reduce the amount of heat in the living room on sunny days without obstructing the view to the outside permanently?

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What could I do to reduce the amount of heat in the living room on sunny days without obstructing the view to the outside permanently?

What I find works well are traditional Venetian-blinds with silver-coloured metal horizontal slats.

Even though these are inside the window, they are still remarkably effective at reflecting sunlight out the window and preventing sunlight from heating interior surfaces such as carpets.

They also let air through when you open your window, which can be an advantage if the air outside is not hot.

By adjusting the angle, you can allow indirect light in to illuminate the room, and allow you to see out, while simultaneously blocking direct sunlight completely.

The traditional French system of external slatted wooden shutters and windows that open inwards is probably better - but that is not an option available to you.

A typical German solution is external slatted roller blinds that have small gaps between the slats which only close up when the blind is fully down. But these are usually installed when the building is constructed and are not easy to add afterwards.

  • The Venetian blinds are a valid option! I currently have white curtains that I can pull, it helps just a little bit. The Venetian blinds have the advantage that allow one to still look out of the window in a certain angle. I probably would have to install them on the top ceiling as I could not open the windows any more. There should be just enough space between the curtain rail and the wall, I hope. – Martin Ueding Jul 22 '16 at 20:04

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