This is not be a decision to make casually. You need to pay close attention to the security and safety methods work best for your home.
Always have the locks after moving into a new home.You don’t know how many keys have or have handed out. Do the same thing if you misplace a key.
Ask friend for advice they have prior to purchasing a security system or company. Your friends have dealt with you. Ask around to get lots of advice for making a good choice.
Don’t allow anyone you don’t completely know to look into your house. Even if the person has a compelling story, requires help or has a great product to sell, they should not be given access. This is the joint to see if there is home security equipment.