ᐅ Summer heat protection – reducing window area?

Created on: 4 Aug 2021 07:26
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NordischJung
Hello everyone,

I could use a bit of advice or some help thinking this through.

We are currently planning a new build, and the floor plan, building permit / planning permission, etc. are all finalized. We could start immediately if it weren’t for an expensive showstopper raised by the energy consultant.

Due to a slope in the terrain, our living/dining area and the adjoining semi-open kitchen are situated lower. The ceiling height is about 3.8m (12.5 ft). The windows facing the garden are two 3x3m (10x10 ft) ones to the west, plus a large corner window to the east. Now, we are being told that all windows in this critical room require external shutters. Improving the Ug/Uw rating of the windows wouldn’t change this. The window-to-room ratio is about 40%. The fact is: this is not affordable.

Current suggestion: no windows, only a glass door with a transom window above. This means we would no longer be able to look out onto our garden, which is absolutely not acceptable for us.

The consultant is therefore denying the necessary summer heat protection. If it’s only about this critical room—what else can be done?

1) We have a ventilation system installed, with enhanced night ventilation considered. It’s unclear whether heat recovery is included.
2) District heating or air-to-water heat pump.

Are there models that could integrate an affordable air conditioning system just for 2 rooms? That way, we would have a solution for about 15 to 20 days per year. Does anyone have an idea how the cost of this would compare to six external rolling shutters?

We keep hearing only about shutters or “no” windows and just replacing them with a glass door. We feel really cornered.

We would be very grateful for any ideas or suggestions.
11ant4 Aug 2021 21:41
andimann schrieb:

A room with 18 sqm (194 sq ft) of west-facing windows is likely to be practically uninhabitable for about half the year.
I can’t shake the feeling that the draftsman used invisible ink. I don’t see any drawing at all here, just comments as if there once were drawings. So far, I’ve only encountered this phenomenon in the Green in this form.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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Traumfaenger
4 Aug 2021 22:38
NordischJung schrieb:

During the planning phase (architect for designs, draftsman, structural engineer) it was said: no problem at all. It’s clear now that we have to take action. But 6 roller shutters or venetian blinds cost quite a bit. So we’re looking for an alternative proof method.
Nowadays, sliding shutters / hinged shutters / folding shutters with wooden slats on the outside are used more often. They can look quite nice, though I’m not sure if they’re cheaper than venetian blinds. We have venetian blinds everywhere, and that’s a noticeable difference compared to traditional roller blinds in the old house when the sun is strong. A very cheap option might be vertical awnings without side guides, but they don’t look very reliable to me. Perhaps a well-placed sun sail outside could also help, especially if you’re building into a slope.

But honestly: when building a new house, I wouldn’t cut costs on shading but rather save elsewhere. If you go for a half-hearted cheap solution now, with ongoing climate change you’ll likely spend a lot on fixing it in a few years. That’s my expectation.
Tolentino4 Aug 2021 22:40
What is the additional cost your general contractor is charging?
Are you building with a general contractor at all?
Y
ypg
4 Aug 2021 22:53
NordischJung schrieb:

Due to the slope of the terrain, our living/dining room and the adjacent semi-open kitchen are at a lower level. Ceiling height is about 3.8m (12.5 feet). Windows facing the garden are two 3x3m (10x10 feet) on the west side, plus a large corner window on the east.
NordischJung schrieb:

Window-to-room ratio about 40%.

I find that hard to imagine.
NordischJung schrieb:

Current proposal: No windows, only a glass door with a transom window. So we would no longer have a view of our garden.

And this is the alternative to 40% window area?
Either three by three meters or a transom above a glass door?
And you can’t see through a glass door?
Apparently, there is only 100% or 15%!
What about 50 or 60% of your 3x3m windows?
For example, two by three meters?
NordischJung schrieb:

That’s not possible cost-wise.

That actually makes me smile too. You know that it’s recommended to set aside a 10% contingency on the house price for unforeseen expenses, right?
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HarvSpec
5 Aug 2021 11:25
A more cost-effective (in the long run!) alternative to external shading (such as venetian blinds, roller shutters, or blinds) is, in my opinion, hard to find.
As has been mentioned several times here, it simply makes sense to install them. So the only alternatives left are either additional financing or smaller windows (although personally, I would also add shading to smaller windows).
D
driver55
5 Aug 2021 11:40
To provide an assessment, the floor plan and elevations would need to be seen...