During very hot summer days, keeping windows and curtains closed during peak heat hours can help prevent your room from becoming hotter. The strongest sunlight usually occurs from late morning to afternoon, and direct sunlight entering a room can quickly raise indoor temperature.
When sunlight passes through windows, it heats furniture, floors, walls, and beds. These objects absorb heat and slowly release it back into the room, making the room feel warm for many hours. By closing curtains or blinds, you create a barrier that reduces the amount of heat entering your room.
Light-colored, thick, or blackout curtains are often more effective because they reflect or block more sunlight compared to thin dark fabrics. If you do not have curtains, you can temporarily use light-colored cloth sheets over windows to reduce direct sunlight.
Keep windows closed during the hottest part of the day because hot outside air can also enter and increase room temperature. Then, during early morning or late evening when outdoor air becomes cooler, open windows to allow fresh air circulation.
This method can help:
• Reduce indoor heat buildup
• Make the room more comfortable
• Lower the need for constant fan or cooler use
• Help maintain a cooler environment during extremely hot days in summer