I recommend having a security system installed (make sure you are given a yard sign and window stickers which can act as an added deterrent). Most people only set it when they are away from the home or when they go to bed at night, but now we'll be keeping ours on during the day as well, and you should too.

This type of wireless security system can also be controlled through the internet, which is great for a second homeowner. Through an online interface you can see system activity, arm and disarm if necessary, and more. Check it out if you're looking for a great wireless internet security system.
Be safe!