Leaving a Home for 30+ Days: Mail, Water, Thermostat, and Who Has a Key
Being away from home for a month or more is fundamentally different from a standard two-week holiday. Minor maintenance items that can be deferred during a short trip—such as mail accumulation, slow plumbing leaks, or seasonal temperature swings—can turn into significant property issues over an extended absence.
Before leaving for 30 days or longer, here is what you need to sort across the four critical home systems: mail, water, temperature, and physical access.
1. Mail: The 30-Day Rule and Forwarding Options
A build-up of physical mail is one of the most obvious indicators that a residence is vacant. Handling it over an extended period requires understanding Postal Service limits:
- USPS Hold Mail (Up to 30 Days): The United States Postal Service allows you to place mail on hold for a minimum of 3 days and a maximum of 30 days. If your trip is 30 days or fewer, your local Post Office will hold your letters and packages safely and deliver them on the date you specify when you return.
- Absences Longer than 30 Days: If you will be gone for more than 30 days, USPS will not extend a standard Hold Mail request beyond the 30-day ceiling. To manage mail for longer trips, you have three primary options:
- Have a trusted person collect it: Ask a neighbor or friend to clear the physical mailbox at least once or twice a week.
- USPS Premium Forwarding Service (PFS): A paid service where the postal service batches your mail and reships it weekly via Priority Mail to your temporary destination.
- Official Forwarding or Virtual Mailbox: Submit a temporary change of address to forward mail to a temporary address, or use an independent mail-scanning forwarding service that digitises envelopes and forwards essential correspondence.
2. Water: Shutoffs, Drains, and Appliances
Water damage from plumbing line breaks, failed appliance hoses, or pinhole pipe leaks represents one of the most common and costly perils for unattended homes.
- Shut Off the Main Valve: Unless your home relies on a boiler heating system or an automated indoor fire sprinkler system that requires constant line pressure, shut off the main water supply valve to the house before departure.
- Relieve System Pressure: After closing the main valve, open the highest and lowest faucets in the house to drain excess water and relieve trapped pressure, then close them again.
- Appliance Valves: If your heating system prevents you from turning off the main water line, turn off individual supply valves for washing machines (rubber hoses can split under continuous pressure), dishwashers, and all toilet supply lines.
- Water Heater Settings: Switch your water heater to "Vacation" mode, or dial the temperature setting down. You do not need to keep 50 gallons of water heated to 120°F while the home sits empty.
- Exterior Faucets and Hoses: Disconnect all garden hoses from outdoor spigots. In freezing temperatures, a connected hose holds trapped water against the exterior sillcock, preventing freeze-proof faucets from draining properly and causing indoor wall bursts.
3. Thermostat and Climate Management
Shutting off heating or cooling completely to save utility costs can create severe structural and pipe issues.
- Cold Weather Absences (Preventing Freezing Pipes):
- Never turn off the heating system during winter months.
- Disaster preparedness agencies (such as FEMA and IBHS) recommend maintaining interior home temperatures at 55°F (13°C) or higher throughout the absence.
- Open interior cabinet doors beneath kitchen and bathroom sinks so warm room air can circulate around plumbing lines running against exterior walls.
- Warm Weather Absences (Preventing Mold and Humidity):
- In humid climates, leaving air conditioning off allows indoor humidity to spike, creating conditions for mold and mildew growth.
- Set your cooling system between 78°F and 82°F (25°C to 28°C) with the fan set to "Auto", or run a dedicated dehumidifier with a continuous gravity drain into a sink or floor drain.
4. Who Has a Key: Access and Insurance Protocols
Leaving your home completely unattended for an entire month can also complicate property insurance coverage if an incident occurs.
- Check Your Homeowners Policy (Vacancy Clauses): Many standard homeowner insurance policies contain vacancy or unoccupancy clauses. Some policies require that a home be inspected by a designated person every 7, 14, or 30 days to maintain full coverage for water or freeze damage. Check your policy terms or speak with your agent to understand any inspection requirements.
- Key Handoff vs. Hidden Keys: Hand a physical key directly to your designated caretaker, or store one in a high-quality, weather-resistant outdoor combination lockbox. Never leave keys under doormats, flowerpots, or fake rocks.
- Alarm Codes: Do not write alarm master codes or security passwords on paper left inside the home. Set up a separate guest or maintenance code through your security provider's app or control panel, and test it before leaving.
- Scheduled Check-In Walkthrough: Provide your caretaker with a clear, one-page guide that lists emergency repair numbers, the main shutoff location, and a quick checklist to walk through rooms, look at ceilings, and confirm doors and windows remain latched.
Away Mode includes a dedicated checklist section covering extended absences alongside the rest of your household checklist.
Sources and primary references
- United States Postal Service (USPS), USPS Hold Mail Regulations and FAQ (usps.com).
- Federal Emergency Management Agency (FEMA), Protecting Home Systems from Freezing Weather (fema.gov).
- Insurance Institute for Business & Home Safety (IBHS), Preventing Water Damage During Unoccupied Periods (ibhs.org).
- Insurance Information Institute (Triple-I), Coverage for Vacant and Unoccupied Homes (iii.org).