Securing a home you are flipping

[Ty Kashmiry]

Hey everyone I am flipping a home in an ok area.  Our contractor takes everything home every night but we did have someone kick in one of the doors last night.  I wanted ideas on how to prevent anyone coming into the house when we are done and all the appliances are in the house etc.  I also worry about putting in the new A/C AND someone backing in a truck and cutting the line and stealing it.  Any help would be appreciated.  My first flip in a neighborhood like this one