summer thermal protection - reduction of windows?

To evaluate, the floor plan and the elevations would have to be seen...

Well, with two (!) 3x3m windows in the west, I know without a floor plan that this is going to go wrong. Of course, it would have been nice if the planner had anticipated this without an energy consultant... especially when a large corner window is planned in the east and a total of 40% window/living area is planned.

Be that as it may, the energy consultant deserves the medal 'Against the animal heat' and you should be grateful to him. Without external heat protection, the house will be de facto uninhabitable. With south-facing windows, you might still be able to do something with roof overhangs or the like (in summer the sun is high, and in winter the heat input from the lower sun is welcome), but with east and west windows you MUST be able to shade the windows.

Believe me, I lived until November in an old building from 1886: 80 cm thick solid brick walls and about half as much window area as you have planned. Pure east-facing windows were enough to heat the place to 28° in summer... and the house had absolutely nothing to do with today's insulation standards.

Clear recommendation: Venetian blinds!!!

Hi everyone,

first of all, THANK YOU to everyone who commented. There were many valuable pieces of advice that made us rethink things overall.

In advance: The energy consultant was hindered by his program from combining different thermal insulation measures and therefore recommended more than necessary. Anyway.

Conclusion:
- All windows will be reduced in height by 50 cm.
- The two west-facing windows will be reduced from 3x3 to 2x2.5 and will get venetian blinds.
- The corner window in the northeast will be shortened by 1.5 towards the north and will receive
- In the manual calculation, the building’s projections could be used for shading.

-> In the end, we spent another €300 on a 3D simulation. Worth it. If we had known that earlier, we would have had to iterate a few times less.

Many thanks to everyone!

All windows will be reduced in height by 50cm.

The windows in the invisible house design ...

I would like to add that I experienced with my son in summer that after shading a single, very small roof window, the room temperature suddenly changed from sauna-like to absolutely bearable. As long as such a window is facing the sun, I would never have it without shading. In the case just described, immense heat was caused solely by ONE unshaded window (here roof window), which can take away your desire for the whole rest of the house.

Thank you for the feedback. I only saw the thread late. If it should get too warm in the summer, a temporarily stretched sunshade sail will also help. It will be fine!