Abstract: A smart bar lock that includes a pole with a length that corresponds to a length of an area that a sliding portion of a sliding door slides along, a motorized hinge coupled to an end of the pole, where the motorized hinge is configured to rotate to the pole by the end of the pole, and a processor. The processor is configured to perform operations of determining to lock the sliding door, moving the pole from a vertical position into a horizontal position with the motorized hinge, determining to unlock the sliding door while leaving the sliding door closed, and moving the pole into the vertical position with the motorized hinge.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for implementing a smart firearm safety device. The safety device attaches to a firearm having a trigger and a slot for receiving a magazine. The safety device includes a locking mechanism that attaches to the trigger to preclude depressing a trigger of the firearm and a sensor that determines an orientation of the firearm or a relative motion of the firearm to indicate detected movement of the firearm. The safety device also includes a radio device that receives parameter signals from the sensor indicating movement of the firearm. The radio device communicates with a component of a property monitoring system to receive a command to engage the locking mechanism to preclude depressing the trigger of the firearm based on parameter signals indicating a particular type of detected movement of the firearm.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for monitoring air quality with multiple sensing devices. The methods, systems, and apparatus include actions of: obtaining first sensor data from a sensor that is not an air quality sensor, determining that the first sensor data satisfy a first air quality criterion, in response to determining that the first sensor data satisfy the first air quality criterion, obtaining second sensor data from an air quality sensor, determining that the second sensor data satisfy a second air quality criterion, and based on a determination that the second sensor data satisfy the second air quality criterion, activating an air quality device.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for monitoring air quality with multiple sensing devices. The methods, systems, and apparatus include actions of: obtaining first sensor data from a sensor that is not an air quality sensor, determining that the first sensor data satisfy a first air quality criterion, in response to determining that the first sensor data satisfy the first air quality criterion, obtaining second sensor data from an air quality sensor, determining that the second sensor data satisfy a second air quality criterion, and based on a determination that the second sensor data satisfy the second air quality criterion, activating an air quality device.

Abstract: Methods, systems, and apparatus for monitoring consumable gas usage are disclosed. A method includes obtaining, from one or more sensors installed at a property, sensor data that indicates one or more attributes of the property; based on the sensor data, determining an expected amount of gas consumption at the property; obtaining, from a gas meter installed at the property, gas meter data that indicates a gas consumption at the property; determining, based on the gas meter data and the expected amount of gas consumption, that the gas consumption at the property meets criteria for abnormal gas consumption; and based on determining that the gas consumption at the property meets criteria for abnormal gas consumption, performing one or more monitoring system actions. Determining an expected amount of gas consumption at the property comprises determining an operating status of each of a plurality of gas consuming appliances at the property.

Abstract: A monitoring system that is configured to monitor a property is disclosed. The monitoring system includes a sensor that is configured to generate sensor data that reflects an attribute of the property. The monitoring system further includes a hot water circulation system that is configured to selectively circulate hot water between a hot water source and at least one of multiple locations of the property. The monitoring system further includes a monitor control unit that is configured to receive and analyze the sensor data. The monitor control unit is further configured to determine to circulate hot water between the hot water source and a first location of the multiple locations of the property and to bypass circulating hot water between the hot water source and a second location of the multiple locations of the property.

Abstract: Techniques and systems are described for power generation management. A described technique includes receiving, by a controller, a request to activate a power generator, wherein the power generator is fuel-based; receiving, by the controller, one or more sensor inputs from one or more sensors situated at or nearby the power generator; using, by the controller, the one or more sensor inputs to detect human activity around the power generator; and controlling, by the controller, an activation of the power generator in response to the request based on whether human activity is detected around the power generator.

Abstract: Methods, systems, and apparatus for monitoring consumable gas usage are disclosed. A method includes obtaining, from one or more sensors installed at a property, sensor data that indicates one or more attributes of the property; based on the sensor data, determining an expected amount of gas consumption at the property; obtaining, from a gas meter installed at the property, gas meter data that indicates a gas consumption at the property; determining, based on the gas meter data and the expected amount of gas consumption, that the gas consumption at the property meets criteria for abnormal gas consumption; and based on determining that the gas consumption at the property meets criteria for abnormal gas consumption, performing one or more monitoring system actions. Determining an expected amount of gas consumption at the property comprises determining an operating status of each of a plurality of gas consuming appliances at the property.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for implementing a smart firearm safety device. The safety device attaches to a firearm having a trigger and a slot for receiving a magazine. The safety device includes a locking mechanism that attaches to the trigger to preclude depressing a trigger of the firearm and a sensor that determines an orientation of the firearm or a relative motion of the firearm to indicate detected movement of the firearm. The safety device also includes a radio device that receives parameter signals from the sensor indicating movement of the firearm. The radio device communicates with a component of a property monitoring system to receive a command to engage the locking mechanism to preclude depressing the trigger of the firearm based on parameter signals indicating a particular type of detected movement of the firearm.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, are described for implementing a smart firearm safety device. The safety device attaches to a firearm having a trigger and a slot for receiving a magazine. The safety device includes a locking mechanism that attaches to the trigger to preclude depressing a trigger of the firearm and a sensor that determines an orientation of the firearm or a relative motion of the firearm to indicate detected movement of the firearm. The safety device also includes a radio device that receives parameter signals from the sensor indicating movement of the firearm. The radio device communicates with a component of a property monitoring system to receive a command to engage the locking mechanism to preclude depressing the trigger of the firearm based on parameter signals indicating a particular type of detected movement of the firearm.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for monitoring air quality with multiple sensing devices. The methods, systems, and apparatus include actions of: obtaining first sensor data from a sensor that is not an air quality sensor, determining that the first sensor data satisfy a first air quality criterion, in response to determining that the first sensor data satisfy the first air quality criterion, obtaining second sensor data from an air quality sensor, determining that the second sensor data satisfy a second air quality criterion, and based on a determination that the second sensor data satisfy the second air quality criterion, activating an air quality device.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for monitoring air quality with multiple sensing devices. The methods, systems, and apparatus include actions of: obtaining first sensor data from a sensor that is not an air quality sensor, determining that the first sensor data satisfy a first air quality criterion, in response to determining that the first sensor data satisfy the first air quality criterion, obtaining second sensor data from an air quality sensor, determining that the second sensor data satisfy a second air quality criterion, and based on a determination that the second sensor data satisfy the second air quality criterion, activating an air quality device.