Which is cooler windows open or closed.

55 replies

LancashireButterPie · 11/07/2026 06:18

I'm lying here in a lovely cool room with the curtains closed and the windows open, there is a nice cooling airflow. DH is insisting on closing the window to keep the room cool because he's seen that advice on the TV.

How does closing the window cool the room?
Surely for hundreds of years if your greenhouse was overheating you would open the windows?

The other rooms in our house which have closed windows (it's 6am) are already hot.

Windows open or closed? Please settle the argument.

OP posts:

TheChosenTwo · 11/07/2026 06:21

Yeah open while it’s cooler outside than inside and then close them by about 8am - well that’s what we do anyway. Last night my bedroom dropped down to 25°, think it’s the coolest it’s been in a while, I got under the duvet 😂

Whooopthereitis · 11/07/2026 06:21

Open for now while it’s colder outside than in; closed later in the morning and through the day once it heats up outside and it’s hotter outside than in; open again in the evening when it’s cooled outside.

SharkEnthusiast · 11/07/2026 06:20

Closed when the outside temperature exceeds the inside temp then open again when it doesn’t. It does work but it’s horrible and made more bearable by aircon. We had to do it when we lived in Cyprus so know it makes a difference. Let the cool air in while you can though.

TheCountessofFitzdotterel · 11/07/2026 06:20

Open now while it’s still cool outside then close when it warms up

SodapopCurtis · 11/07/2026 06:19

Open for the next hour and then closed. The air warms up

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