When it comes to is it better to leave blinds open or closed the answer is not cut and dry. It depends on how much you value your privacy, how long you are away from home and if someone will be looking after your home while you are away. Burglars are more likely to target a house that looks unoccupied so it is important that you find a reliable person to stay at your house and take care of your curtains and blinds.
Leaving your curtains open will display your belongings to opportunistic burglars and will allow peeping toms to see into your living space and bedroom. It is also not a good idea to keep your curtains open at night if you live on the top floor of a high-rise building because it will let cold air in and may cause you to overheat.
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On the other hand, keeping your curtains open will help you wake up in the morning with natural light and it can make your rooms appear bigger and brighter. It is also beneficial for indoor plants as it provides them with the sunlight they need to survive and thrive.
If you have asthma, cystic fibrosis or other respiratory diseases, then the extra sunlight can be beneficial as it can help kill bacteria that live in dust and other debris in your home. However, if you want your home to be safe from thieves and burglars, then closing the curtains at night is a better option as it will make your home look unoccupied and discourage intruders.