A security system for use in a premises, the security system comprising: a sensor communication interface configured to communicate with a plurality of sensors (140, 142,144); an output interface; and at least one processor in communication with the sensor communication interface, the at least one processor configured to: receive, via the sensor communication interface, sensor data from one or more of the plurality of sensors; determine, from a plurality of tiers that define respective predefined regions based on relative distance to the premises, a respective tier where a sensor configured to provide the sensor data is positioned, wherein the plurality of tiers includes a low tier, an intermediate tier, and a final tier, wherein the low tier comprises a first predefined region from a front door of the premises, wherein the intermediate tier comprises a second predefined region from the front door of the premises and closer to the front door of the premises than the first predefined region, and wherein the final tier comprises a third predefined region within the premises; determine, based on the sensor data and the respective tier, whether to change a state of the security system; in response to determining to change the state of the security system, change the state of the security system to a changed state, wherein, responsive to input from a sensor positioned in the low tier, the at least one processor changes the state of the security system from a "normal" state to a "heightened" state that is more likely to output an alarm than the "normal" state, wherein changing the state of the security system to the "heightened" state comprises modifying operation of a sensor in the intermediate tier; and determine, based on the changed state of the security system, whether to generate an output via the output interface. a sensor communication interface configured to communicate with a plurality of sensors (140, 142,144); an output interface; and at least one processor in communication with the sensor communication interface, the at least one processor configured to: receive, via the sensor communication interface, sensor data from one or more of the plurality of sensors; determine, from a plurality of tiers that define respective predefined regions based on relative distance to the premises, a respective tier where a sensor configured to provide the sensor data is positioned, wherein the plurality of tiers includes a low tier, an intermediate tier, and a final tier, wherein the low tier comprises a first predefined region from a front door of the premises, wherein the intermediate tier comprises a second predefined region from the front door of the premises and closer to the front door of the premises than the first predefined region, and wherein the final tier comprises a third predefined region within the premises; determine, based on the sensor data and the respective tier, whether to change a state of the security system; in response to determining to change the state of the security system, change the state of the security system to a changed state, wherein, responsive to input from a sensor positioned in the low tier, the at least one processor changes the state of the security system from a "normal" state to a "heightened" state that is more likely to output an alarm than the "normal" state, wherein changing the state of the security system to the "heightened" state comprises modifying operation of a sensor in the intermediate tier; and determine, based on the changed state of the security system, whether to generate an output via the output interface. receive, via the sensor communication interface, sensor data from one or more of the plurality of sensors; determine, from a plurality of tiers that define respective predefined regions based on relative distance to the premises, a respective tier where a sensor configured to provide the sensor data is positioned, wherein the plurality of tiers includes a low tier, an intermediate tier, and a final tier, wherein the low tier comprises a first predefined region from a front door of the premises, wherein the intermediate tier comprises a second predefined region from the front door of the premises and closer to the front door of the premises than the first predefined region, and wherein the final tier comprises a third predefined region within the premises; determine, based on the sensor data and the respective tier, whether to change a state of the security system; in response to determining to change the state of the security system, change the state of the security system to a changed state, wherein, responsive to input from a sensor positioned in the low tier, the at least one processor changes the state of the security system from a "normal" state to a "heightened" state that is more likely to output an alarm than the "normal" state, wherein changing the state of the security system to the "heightened" state comprises modifying operation of a sensor in the intermediate tier; and determine, based on the changed state of the security system, whether to generate an output via the output interface.