This privacy policy describes the Android application Heat recovery for controlling compatible DC40 heat-recovery units. The application package is cz.atomsoft.dc40.remote.

The application is an independent, unofficial third-party project. It is not affiliated with, endorsed by or supported by the manufacturer of the compatible units or by an official application.

No remote collection, advertising or analytics

The current application does not require an account or sign-in. It contains no advertising, advertising identifier, analytics, Firebase Crashlytics or other crash-reporting SDK. It has no publisher-operated cloud account or remote backend. The application does not collect or share user data with the publisher, advertisers or an analytics/crash-reporting provider.

The publisher must update this policy and the Google Play Data safety declaration before distributing a version that changes any of these practices.

Information processed on the device

To discover and control a unit, the application can process local-network information such as mDNS service names, local IP addresses and unit identifiers. It can receive and display unit readings and state, including temperature, humidity, CO₂, power, operating mode and filter information.

The release application stores user preferences locally, including unit display names, room icons, ordering, theme and language. It does not include a user-facing log upload feature. Development and debug builds may write local diagnostic logs for testing; these logs are not sent to the publisher automatically.

Local network communication

The application sends control requests to and receives measurements from compatible DC40 units on the user's local Wi-Fi network. The phone and units need to be connected to the same local network. The current appliance protocol uses HTTP on that local network, so the connection is not encrypted by the application. This is direct communication with the user's own local devices; the application does not forward this information to a publisher-operated server. Use a trusted local network and keep the unit firmware up to date.

Optional Wear OS companion

When the Wear OS companion is paired, the phone and watch exchange unit snapshots and control messages through the Android/Wearable platform data layer. This exchange supports the companion experience and is not an account or publisher cloud service. The platform provider may process data under its own terms; consult the platform privacy information for details.

Sharing and retention

The current release does not intentionally sell, share or transmit the locally processed information to the publisher or advertisers. Local preferences remain on the device until the user clears the application's data or uninstalls the application. The publisher has no application account data to delete in the current design, and the release application does not provide a mechanism for users to submit logs or other data to the publisher.

Children

The application is a household-device controller and is not directed to children. It does not knowingly collect children's personal information.

Changes and contact

The publisher may update this policy when the application or its data practices change. The current version and effective date are shown on this page. Questions can be sent to support@atomsoft.cz.