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A home security system can be active or passive - that is using active components i.e. window and door switches or passive as in infrared or motion sensors. Passive components can be hidden or at the most placed in inconspicuous areas to detect motion or body heat and trigger an alarm or dial up law enforcement. If you have pets then the active component route may be needed because of roaming in the house. There are window break devices that may be used without compromising the use of a window. The old style window foil is pretty much obsolete giving way to vibration sensors. Check out ADT's web site. I'm sure they'll point you in the right direction.
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