Google Nest Learning Thermostat

Google does not share data with third parties for their own advertisement purposes. Google does not sell personal data.

Google shares data with its affiliates and business partners: "We provide personal information to our affiliates and other trusted businesses or persons to process it for us, based on our instructions and in compliance with our Privacy Policy and any other appropriate confidentiality and security measures. For example, we use service providers to help operate our data centers, deliver our products and services, improve our internal business processes, and offer additional support to customers and users. We also use service providers to help review YouTube video content for public safety and analyze and listen to samples of saved user audio to help improve Google’s audio recognition technologies."

At the same time, Google uses collected data on its own services. "We use the information we collect to customize our services for you, including providing recommendations, personalized content, and customized search results."

Google may collect data on you from public and third-party sources. "In some circumstances, Google also collects information about you from publicly accessible sources. For example, if your name appears in your local newspaper, Google’s Search engine may index that article and display it to other people if they search for your name. We may also collect information about you from trusted partners, such as directory services who provide us with business information to be displayed on Google’s services, marketing partners who provide us with information about potential customers of our business services, and security partners who provide us with information to protect against abuse. We also receive information from advertising partners to provide advertising and research services on their behalf."

Google also uses personal data for personalised advertisement, if a user allows: "Depending on your settings, we may also show you personalized ads based on your interests. For example, if you search for “mountain bikes,” you may see an ad for sports equipment when you’re browsing a site that shows ads served by Google. You can control what information we use to show you ads by visiting your ad settings."

Google uses location for advertisement, too. It gets location from various sources: "Google’s ad products may receive or infer information about your location from a variety of sources. For example, we may use the IP address to identify your general location; we may receive precise location from your mobile device; we may infer your location from your search queries; and websites or apps that you use may send information about your location to us. Google uses location information in our ads products to infer demographic information, to improve the relevance of the ads you see, to measure ad performance and to report aggregate statistics to advertisers."

Google may combine information about you from their other services or devices. "We may combine the information we collect among our services and across your devices for the purposes described above. For example, if you watch videos of guitar players on YouTube, you might see an ad for guitar lessons on a site that uses our ad products."

Google says they keep video footage, audio recordings, and home environment sensor readings separate from advertising, and they won’t use this data for ad personalization.

Google provides various privacy controls, accessible via Google Privacy tools. There are several clearly defined ways to delete personal data, including deleting data from Nest app or deleting a whole Google Account. An autotimer can be set up for 3 or 18 months. The retention details are also listed in the Policy.

"When you delete data in your Google account, we immediately start the process of removing it from the product and our systems. First, we aim to immediately remove it from view and the data may no longer be used to personalize your Google experience."

To delete Google Home search history and voice recordings: See the "Data deletion" section of Data security and privacy on devices that work with Assistant.

Google sets various data retention timeframes for different data types: "In some cases, rather than provide a way to delete data, we store it for a predetermined period of time. For each type of data, we set retention timeframes based on the reason for its collection. For example, to ensure that our services display properly on many different types of devices, we may retain browser width and height for up to 9 months. We also take steps to anonymize certain data within set time periods. For example, we anonymize advertising data in server logs by removing part of the IP address after 9 months and cookie information after 18 months."

You can check Google Family Link privacy guide for teens & children for details for different countries and age groups.

You can set up "Include voice and audio activity" option for your child. The "Include voice and audio activity" option under the Web & App Activity setting controls whether voice and audio recordings are stored to your Google Account when you use your voice to interact with Assistant. This option is off by default when creating a Google account, and is not required to use the Assistant.

If your child’s "Include voice and audio activity" option under the Web & App Activity setting is checked, when they interact with the Assistant on a signed-in device, a recording of their interaction, plus a few seconds before, may be stored with their account. Google uses this saved voice and audio activity to develop and improve its audio recognition technologies and the Google services that use them, like Google Assistant. If your child uses Google Assistant with Voice Match and you’ve turned on this voice and audio activity setting, Google may also temporarily process a model of your child’s voice from their saved audio to develop and improve Google’s voice technologies and Google services that use them.