Crack the window or run a fan for real air movement
Still air traps heat around your body. You do not need a smart thermostat or a cooling mattress pad. Crack a safe window when outdoor air is cooler than the room, or point a basic fan so air moves across the bed—not blasting your face all night. Cross-ventilation helps if you can open a second window down the hall. On humid nights, the fan still evaporates sweat and makes the same temperature feel kinder. Keep cords clear of walkways and close the window if pollen or street noise wrecks the night. Air movement is the cheapest cooling upgrade most bedrooms never use.
