Always re-key or replace all locks when first moving in, even if it s newly constructed. Secure sliding glass doors with commercially available bars or locks, or place a wooden dowel or broomstick in door track. Secure window air conditioners to prevent removal from the outside. Instead leave an extra key with a trusted friend or relative. Do not let them in your house.
Install door latches above their reach to be sure.
Exterior Lighting - all possible entrances should be well lighted. Trim any bushes or trees that hide doors or windows. Keep curtains and window shades closed at night. Use automatic timers for lights, radios, and anything that makes your home look occupied. Keep ladders, tools, toys, and recreational equipment inside when you re not using them.