Privacy Policy

HeatGuard is designed to minimize data collection. This policy describes what data is processed and where it is sent.

Local Data Storage

All user data (profiles, rooms, devices, occupants, AC units, forecast cache) is stored exclusively in your browser's IndexedDB. No user data is stored on the server. Clearing your browser data will delete all HeatGuard data.

Cookie

HeatGuard sets a single cookie (heatguard_lang) to remember your language preference. It expires after one year and contains only the language code (en or de). No other cookies are used.

Weather Forecast API

When you fetch a forecast, your location coordinates (latitude/longitude) are sent to either Open-Meteo (open-meteo.com) or OpenWeatherMap (openweathermap.org), depending on your configuration. These services have their own privacy policies.

Weather Warnings (DWD)

Weather warnings are fetched from the German Weather Service (DWD) via their public WFS endpoint. Your location coordinates are sent as part of the request.

AI Summary (Optional)

If you configure an AI provider, a summary of your room data and weather forecast is sent to the selected provider (Anthropic, OpenAI, Google Gemini, or Ollama). Your API key is sent directly from your browser. No personal data beyond the heat analysis context is included.

Device Database (bettervent.me)

When you search for AC units, your search query is proxied through the HeatGuard server to bettervent.me. No personal data is included in these requests.

No Analytics or Tracking

HeatGuard does not use analytics, tracking scripts, fingerprinting, or any third-party scripts. No data is shared with advertisers or data brokers.