Single Cylinder Deadbolt
These deadbolts are one of the most common types with a keyhole on the outside and from the inside a thumb-turn mechanism. They are affordable and easy to use but there is a small security issue because of the thumb-turn that can be accessed if you have a glass window panel near the door that can be broken.
Double Cylinder Deadbolt
These deadbolt locks are very similar to a single cylinder deadbolts with one difference, they require a key from both sides as there is no there is no thumb-turn on the inside. They are more secure because even if a burglar breaks the glass panel he still need the key to unlock it from the inside. The downside is that in an emergency situation like a fire you’ll need the key to unlock the door from the inside which can delay your escape.
Keyless Deadbolt
These deadbolts doesn’t require a physical key to lock or unlock the door as it uses an electronic keypad Instead. It works on battery power and all you have to do in order to get in is to insert a preset digit code. Although you don’t need a key there is still a keyhole and it is for a backup purposes if and when the batteries are dead.
Smart Deadbolt
These locks takes keyless locks to the next level thanks to Wi-Fi connectivity they connect to the internet and can be controlled with your smartphone from anywhere you are. Most smart deadbolts can be connected to home security systems and even have more advanced features like more automated options.
