The house which I rent and am living in has a kitchen on the first floor, where there is a window facing the yard with its lower half covered by security bar and screen, like this one .
Is it safe to keep the lower half window open at night during sleep?
The top looks like not easy to be pulled down. Is the top half window usually fixed to the top of the window?
I am hesitating to close and lock the window, because if the window is closed during the night, I feel the air in the first floor especially near the kitchen will become a little worse gradually. I guess maybe it is because the gas normally leaks a little from the range, and the pilot fire is kept on?
So shall I close the window for safety or keep it open for air? Note that except during the coldest day, we don't turn on the central air system.
For window of bedrooms on the second floor, do people usually close them at night during sleep for safety?
- I was wondering if the security bar usually only cover the lower-half of a window, and if it is enough or covering the whole window will be a better choice?
For reference, I am living in a city in the United States, where safety is usually a concern.