Avoid opening the door if you don't know who is standing on the other side. You have no way of knowing if the stranger on the other side of the door wishes to do you harm. Enforce a rule within your house that no one opens the door to unexpected people.
Home security plans have other features along with an alarm that goes off during a break-in. You can have your system alert you of any movement in certain areas of your home. Parents riding herd on small children will be thankful for this feature which makes it harder for kids to sneak outside without supervision.
Make sure that you change the locks once you've taken possession of the house. It's important to know everyone who h