The short version
A vacant home needs more than a low thermostat setting. Reliable heat, fuel or power monitoring, vulnerable-pipe protection, a known shutoff, an on-site response plan and deliberate winterization work together to reduce freeze damage. Decide first, deliberately, whether the plumbing stays live or gets fully winterized: partial measures, like turning off one fixture while leaving hidden branches full, create false confidence, not real protection. The most vulnerable piping is predictable: exterior walls, crawlspaces and garages run far colder than occupied rooms, and any location that has frozen before deserves specific air-sealing or relocation work instead of another season of hoping.
Decide whether the plumbing stays live
A continuously heated building and a fully winterized building require different plans. Keeping a building heated means someone learns within hours when the heat or power fails, while draining it means every trap, appliance, boiler loop and water heater has been emptied or protected, and a half-done version of either plan is the one that freezes.
| Plan | Requires |
|---|---|
| Keep it heated | Monitored temperature, an on-site contact, backup power plan |
| Winterize completely | Every water-using and hydronic system drained, water heater power off |
Keep heat reliable, not merely set
Confirm fuel supply, boiler or furnace condition, heat-pump low-temperature strategy, thermostat batteries, service access and what happens during a power outage. Room temperature does not guarantee that a pipe in an exterior wall remains warm.
- Set low-temperature alerts
- Arrange an on-site contact with keys
- Verify fuel delivery and backup power assumptions
- Keep mechanical and plumbing areas accessible
- Document the main and branch shutoffs
Find the pipes most likely to freeze
Exterior walls, crawlspaces, garages, kneewalls, cabinet voids and lines near old foundations can be much colder than occupied rooms. Prior freeze locations deserve specific air-sealing, insulation, heat or pipe-relocation work.
Use monitoring with a response plan
A temperature, power or leak alert is useful only when someone can act. Define who checks the property, how quickly, where the shutoff is and which heating or plumbing service should be contacted.
Professional winterization
Properties that will not remain heated may require water shutoff, draining, compressed-air procedures for suitable lines, fixture protection, appliance-specific steps and clear recommissioning. Boilers, radiant systems, wells and fire-suppression systems need system-specific planning.
After a heat or power loss
Treat restored heat and water cautiously. A split pipe may not leak until ice thaws or supply pressure returns. Inspect accessible areas, monitor the meter where applicable and have the correct shutoff ready.
Common questions
What thermostat setting prevents frozen pipes?
There is no universal safe number because pipe location, insulation, wind and air leakage differ. Monitoring and vulnerable-pipe assessment matter.
Should I leave faucets dripping in a vacant home?
Dripping is not a complete vacancy plan and can create drainage or well-pump issues. Use a deliberate heated-building or winterization strategy.