As soon as the air feels stale you gotta turn off your heating and open all windows for like 5-10 mins in the cold seasons. Air is bad at carrying heat anyway, if you close your windows it’ll get warm again quickly.

German “Stoßlüften”

Northern part of a Nordic country: never during winter; never closed during summer, unless raining.

Southern US, windows are only open in winter, basically whenever it’s comfortable outside. Never in the summer. The A/C runs basically 24hrs a day during the hottest 2 months of the year.

Windows on the car are basically left cracked for the opposite time. Rain deflector are installed to allow for this without rain getting in.

The four days out of the year that it’s comfortable weather in Texas, I’ll open the window. But only with the screen still on, or mosquitoes get in.

Edit: “comfortable” = between 75-80°F

Windows? not often, but I leave my wooden door open, so the kitties can look out and see the birds and stuff.

Northern Spain here, they remain closed all winter except the few times I open them to ventilate. Next month I’ll probably start opening them during the day and at some point in May or June they’ll remain open until the end of September or so.

Dane here. I open all windows for five minutes two times a day, also in the winter.

My body runs like an oven when I’m asleep. To that end, I have the heating off by the time I’m in bed (winter), and if the air still isn’t crisp enough, I’ll open the window a crack.

In the warmer months I straight up cannot sleep if the windows are closed.

Edit: forgot to mention that I am in the UK

I use linux

Maybe you could get a dehumidifyer, measure the humidity first to figure out if it’s necessary

I live in a forested countryside in the Northern Midwest. Leaving the windows open invites in bugs and other small critters. Even with screens on the windows, insects crawl through the cracks, and I’ve definitely had several field mice chew their way through screens. I also have rabbits and possums who tend to nest up against the foundation of my house, and if a lower window is left open for prolonged periods, I sometimes find babies nesting in the window frame.

If I open my windows, it’s for a limited time to get some fresh air moving through the house. I’ll turn on strategically placed fans in various rooms to encourage rapid airflow through the house so I can close the windows sooner.

I only open windows in the winter if I need to cool a room quickly. For instance, I’m renting my first floor to a friend and I live on the second floor. But I only have one HVAC unit and thermostat for the entire house. The first floor always stays a few degrees cooler than the second floor (heat rises), so I keep it a little extra hot upstairs to ensure I’m not freezing out my friend. But I’m always hot in general, so I’ll either have fans on me all winter, or I’ll occasionally shut myself in a bedroom and open the window for 15-20 minutes, just to lower my body temp a bit and help me tolerate the hot house.

There have been a few winter nights where my wife and I have left the bedroom window open to cool down our bedroom, while burying ourselves in thick blankets. We don’t sleep well if we’re sweaty and stuck to the bed. I usually get up a few hours later and close the window, so we don’t freeze overnight.

I live on the Chesapeake Bay, so during the late spring into late Fall, I open my windows pretty much daily on the weekends and whenever I am home during the week.

Spring into early summer and autumn. In the summer, I may open them early on, but it’s best not to let the crazy humidity in.

I hate Windows

Only close them if it’s raining