Write to support@pipeguard.app — a real person reads it, usually answering within two business days.
The app version (Settings → the version line at the bottom), your phone model, and what you expected to happen. In Settings there is Send feedback, which attaches the app version, the platform and the in-app log to the message — it tells you exactly what is being sent before it goes.
Notifications are scheduled by the phone itself, so a phone that was switched off cannot receive them — the app states this during setup. Battery optimisation on some Android phones can also delay them; the app is listed in Settings as an exception.
From the forecast minimum temperature, hours below freezing, wind, and the answers you gave about the house. Thresholds are deliberately conservative: when in doubt, drip.
No. It is guidance based on a forecast and your answers, not a promise about your pipes.
Purchases are handled by the store, so refunds are requested there: on Android through Google Play (Order history → Report a problem), on iOS through Apple (reportaproblem.apple.com). If a refund is refused and you believe the app is at fault, write to us anyway — we would rather refund you than argue.
What the app does with data is written out in full on the privacy page.