Front of the house inwards, back of the house outwards except for upstairs, there it's always inwards. Same with doors. Back door outwards, front door inwards.

New windows! Just over a year old, they all open outwards with the hinges on the wall sides.

I looked at getting tilt and turn ones, but I could get triple glazed normal ones for like half the price.

Slide left/right, but I do have one window that does not open at all.

Mine all slide, they don't swing. Either up/down or left/right

Up, or down.

They don't open "out". The slide open in a frame, with a screen on the outside to keep bugs out. Mine slide left/right.

How is "lüften" a weird cultish ritual? I'm not German, but opening your windows in the morning and in the evening while doing things like brushing your teeth or showering seems pretty standard to me.

Mine are all louvred with smoked glass.

I thought this question was going to be about whether they opened outside or inside.

I have sash windows, but I do love me some side-open crank windows.

Mine have a crank and opens like a door. It's awful. You can't fit a window ac or a portable ac setup in it. I had to get a custom acrylic cutout sized to replace the screen.

All of mine are casement windows. The taller ones hinge open to one side and the shorter ones hinge open from the bottom.

Mine are unusual, in America anyway. The bottom slides up, typical. You can also tilt the bottom inwards from the top. Being that this is a Habitat home, the windows are also energy efficient. They're cheap with doorknobs and faucets, but they go well over code on insulation and structure.

Slide up down, flip a latch and it tilts, flip a different latch and it swings open.

You are missing the most important question:

• Do you windows open toward inside or outside ?

To add to this, which way your door swing

Sad German noises

Just bcs I was curious what would an exotic image search yield:

The car I'm living in has a button that makes them roll down.

What's a "German 3D window"? I don't think I've ever seen one.

But the windows on the house I'm currently living in open similarly to the picture in your post, only sideways.

They slide up

In the US - I just installed an awning window like that. My other current windows slide up from the bottom. When I replace them I will get double hung windows that slide both down from the top and up from the bottom.

I live in Vancouver, Canada, in a townhouse with windows that swing out from the side like these:

See how little that window is open? That's very likely the MAXIMUM it can be open which is dumb as hell.

They also make it impossible to hang a window air conditioner which means you're limited to the significantly less efficient portable air conditioners. But even then you can't form a good seal between the exhaust pipe and the window, which make them even less efficient.

Fuck my windows. We're not allowed to change them even though we own the townhouse because the strata wants to keep all the townhouses consistent. So fuck stratas as well. And the worst part is I see these types of windows EVERYWHERE in new construction around Vancouver.

It's missing the most important question:

• Do your windows open inwards or outwards!?

Nice try, Baba Yaga.

Now, the serious answer is a few windows slide sideways and a few others slide up and down. All have screens to keep bugs out.

Neither. One half slides left over the other half.

Not like that. We don't wanna look like a communist.

Both top and bottom, but opening the top half leaves a gap between the pane and screen while the mechanism for the bottom half is broken, so it falls back down unless I prop it up with a stick.

My windows can open either to the side or kip, which is opening our from the top.

Ours can open all the way either left or right side, or a bit on top (opens inwards on all sides). The way it opens up top is nice to get some circulation going, and is also secure enough to be still covered by insurance in unlikely event someone would break in (appartment is on the first floor, but somewhat elevated. Bottom of the windows are about 2m from the ground).

We also have a mesh on the outsite of the frame to prevent insects from flying in regardless of which way they open.

Both side ? Mine open either Up or right

Mine are attached on one side and open outwards. So when fully open (looking down from above) they make an L shape. There's a little like crank handle you rotate to open/close them.

I don't really like this style, but that's what came with the house.

Edit: They're casement windows, here's a pic:

Open it at the bottom for a breeze, or at the top to let the stank out.

I just break the glass and replace it when I need to open the window

The American way: up and down but it’s always closed because the AC is running.

Some that slide up from the bottom, and some that swing out like a door.

My last house had some like in your thumbnail, some ancient ones with (layers of) small windowlets that slid sideways, and some modern door-style ones as well.

horizontal slide only have one that goes up towards the outside on an upper bathroom