ᐅ Exterior blinds for shading during summer

motorradsilke schrieb:

I wasn’t referring to airing out for one hour in the evening, but rather ventilating overnight. That means all night long, or at least for a few hours.
But normally, on days like that, we’re outside until bedtime anyway. During that time, the windows and doors are open, so by the time you go inside at 10 p.m., it’s no longer 30°C (86°F) inside, because it’s already been significantly cooler for a few hours.

Maybe it also depends on your location—I don’t know where you live—and certainly there are areas where it’s generally cooler, and where you can really open everything up during sunny days.

I’m basing this on Munich and East Westphalia-Lippe (OWL), and from both regions, considering the temperatures of recent summers and the good insulation of newer houses (and we only have a 55 energy standard here), I can say this:
Of course, it’s not 30°C (86°F) inside because during the day we close up everything we can and don’t leave any windows open. Not because we open everything wide in the evening. We’ve already tried that overnight as well—one window open, a window in the attic open, and a fan up there moving the air through once.
It only lowered the temperature by 1-2°C (2-4°F) throughout the entire night.
But we don’t like it hot anyway, and even at 25°C (77°F) in the bedroom, we don’t really sleep well.

People are addressing the symptoms of a trend instead of reconsidering the cause—very large windows. 😀 I can only laugh at that, with our standard casement windows without a 5m (16 feet) glass front. Our space is bright, has a good view, no expensive shading needed, and stays comfortably cool.

Unfortunately, it’s not trendy at all, but I don’t care. 😀

Zaba12 schrieb:

I’m telling you, you’re not considering the new house itself. If you have around 30 degrees Celsius (86°F) or higher during the day, you won’t just have 22 degrees Celsius (72°F) in the evening when you ventilate. The building envelope is heated up so much that as soon as you close the windows, the temperature immediately rises again to around 25 degrees Celsius (77°F), and we have a really well-insulated house with a concrete ceiling and everything.

We also have more glass than wall on the south and west sides (ground floor). We ventilate intensely for about one hour at 6 a.m. when it’s 17 degrees Celsius (63°F), but after closing the windows, the temperature on the ground floor immediately rises again to 20 degrees Celsius (68°F). If you leave the patio door or windows open (without shading) and don’t close them quickly, no matter how different you may be, I advise you to prepare for an air conditioning system. I’m not the only one telling you that what you believe is unrealistic.

But—and I have to qualify this—up to 25 degrees Celsius (77°F) in summer with inclined blinds, it’s really comfortable, even at night.

We have exactly this problem in the attic, which is very well insulated. During a heatwave, the attic is the coolest room in the house (an older building) for quite a while. However, if it lasts several days, the walls heat up despite the closed shutters and then take several days to cool down again. If I take our attic bedroom as an example—which has windows on three sides (west, east, south)—and I create cross-ventilation at night, it’s just about 22 degrees Celsius (72°F), but those temperatures are outside. The moment I close the windows, for example because from 5 a.m. you start hearing car doors, engines, etc., and because it’s already light outside in summer at 5 a.m., it suddenly gets much warmer up there right after closing the windows. I can barely sleep as it is; I hate heat. Without fully tight shutters, I’d give up and rather move to the living room. Without shading... well, I don’t even want to imagine.

motorradsilke schrieb:

I wasn’t talking about ventilating for one hour in the evening, but about ventilating overnight. That means: the whole night. Or at least a few hours.
But normally on such days, we’re outside until bedtime anyway, with windows and doors open during that time. So by the time you come inside at 10 p.m., it’s no longer 30 degrees Celsius (86°F) indoors because it has been much cooler outside for several hours.

But whatever, I see I’m alone in my opinion here. For me, sun and any kind of shading don’t really go together mentally; I find it unpleasant. When it’s sunny, everything that can be opened must be opened, and I want to be outside if possible.

Here, during the last summers, it stayed very warm late into the night, almost unbearable. You open the windows in the evening, but it only brings lukewarm air. It only gets noticeably cooler after 1 a.m., and since you don’t want to invite unwanted guests on the ground floor, you have to close those windows again when going to sleep. Our alarm goes off at 6:15 a.m., so we don’t go to bed at 3 a.m.

The trend of huge glass surfaces and having as much glazed space as possible in the open areas, with bedrooms on the upper floor, is unbearable in summer without air conditioning.
If dark facades become popular instead of white ones, the photovoltaic system will not be able to generate enough electricity to power the air conditioning.

Bookstar schrieb:

People are addressing the symptoms of a trend instead of reconsidering the cause—huge windows. 😀 I can only laugh, with our standard casement windows without a 5-meter (16 feet) glass facade. We have bright rooms, a good view, no expensive shading, and comfortably cool temperatures.

Unfortunately, it’s not trendy at all, but I don’t care 😀

Luckily, apart from the attic, we only have windows facing east and west, not south. As typical for older buildings, we don’t have a lot of window area either, THANK GOODNESS. We have good insulation, but during longer heat waves even a house like this gets uncomfortably warm.