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28. Air Conditioners
A leaking air conditioner can lead to some major health risks, like refrigerant poisoning. This poisoning can lead to heart palpitations, seizures, and even lack of oxygen to your lungs. 

To avoid this, keep a close eye on your AC and act quickly if you notice it leaking refrigerant. You can solve the leak yourself by buying a Freon leak repair kit, or you can call a handyman.