How to Cool a Bedroom Without Opening the Windows

The standard advice for surviving a heatwave is to open all your windows at night to let the cool air in. But for a lot of people in the UK, that simply isn't an option.

If you suffer from severe hay fever and cannot let pollen into the house, if you live on a loud main road, or if you are on the ground floor and don't feel safe leaving windows open while you sleep, you are trapped.

When you cannot vent your room to the outside, you have to fight the heat internally. Here is how to cool your bedroom without opening the glass.

1. Stop the Heat from Entering

If you cannot let hot air out, you must prevent it from getting in.

Standard curtains do almost nothing to stop solar radiation. The sun's UV rays penetrate the glass, hit your carpets and furniture, and convert into heat. You need to install thermal blackout curtains or blinds. These have a white, reflective backing that bounces the solar radiation back out the window before it can heat up the room. Keep these completely shut all day.

2. Eliminate Internal Heat Sources

If your room is a sealed box, every piece of electronics acts like a miniature radiator.

• Gaming PCs and Consoles: Even in sleep mode, they generate heat. Unplug them completely at the wall.

• Lightbulbs: If you still have older halogen or incandescent bulbs, they emit 90% of their energy as heat. Keep the lights off or switch to LEDs.

• You: The human body emits around 100 watts of heat energy per hour. Switch to highly breathable linen or bamboo sheets that wick sweat away from your body rather than trapping it.

3. Creating a Wind-Chill Effect

You cannot run a true portable air conditioner without a window because the machine needs to vent the hot exhaust air outside. If you run an AC in a sealed room, the exhaust will actually make the room hotter.

Instead, you must rely on high-velocity air circulation. A premium tower fan will not lower the actual temperature of the room, but it will create a powerful "wind-chill" effect. By constantly moving the air across your skin, it evaporates your sweat, tricking your nervous system into feeling physically colder.

Position the fan at the foot of your bed, set it to oscillate, and let it sweep the room.

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