Open your bedroom window wide, allowing the cool air to permeate your bedroom. You'll need to open your curtains and blinds to ensure that the cool air circulates throughout the room. Step 2.

Generally speaking, you should open your windows if it’s cooler outside than in. There’s no ‘set rule’ for keeping windows ...

An open door helps increase airflow and regulate a bedroom’s temperature. If your door needs to be closed, consider opening a window instead – even in winter and even if it's just a crack.