Scenario · Attached garage with a water heater

The same corner dips below 34°F every clear night

Scenario: repeat freeze alerts in an attached garage. How ProbeHarbor history and CSV export point to a drafty door seal before supply lines ice.

Illustrative scenario. This is a walkthrough of how ProbeHarbor behaves in a common failure, not an account from a real customer. The features, thresholds, and plan limits are real.

Blue PEX and copper water lines with valves in a basement ceiling
Supply lines in basements and crawlspaces are the freeze risk that history charts prove. Photo: Tomwsulcer. CC0

The setup

  • Arduino + DHT22 on a shelf above the water heater
  • Email alerts at 34°F on the Free plan; Member for CSV export
  • Indoor garage compared against outdoor weather on the dashboard

How it plays out

  1. Week 1: Alerts fire on clear, still nights; it looks like ordinary cold.
  2. Week 2: History and CSV show the door-side probe dipping first every time.
  3. Week 3: After weatherstripping the door, nights stay above the threshold.

Why it matters

An alert tells you something is wrong; history tells you where. A cheap seal fix beats waiting for the night it gets cold enough to split a pipe.

Real outcomes depend on sensor placement, thresholds, and how quickly someone can respond.

FAQ

Is the Free plan enough for this?

Free email alerts catch the problem. Member adds CSV export and longer history, which makes a repeating pattern easy to see.

Do attached garages freeze?

Yes, especially along exterior walls and leaky doors. Attached is not the same as heated.

Related answers

Try it on your space

Start free with live charts, email alerts, and one family live share link. Upgrade when you want CSV history (Member) or SMS and expanded share scopes (Pro: 14-day trial).

See plans & pricing Create free account Compare vs DIY · All scenarios