Shutting down a house for winter, whether for seasonal occupancy, extended travel, or between tenants, requires systematic preparation to prevent costly damage from freezing pipes, ice dam formation, and pest intrusion. A single oversight during winterization can result in thousands of dollars in water damage when temperatures drop below freezing. This guide provides a comprehensive approach to winterizing a home for cold weather protection, covering plumbing, heating, structural, and interior preparations that ensure the house remains in good condition until spring.
Plumbing System Winterization
Frozen pipes are the most common and most expensive consequence of inadequate winter preparation. Water expands as it freezes, generating pressures exceeding 2,000 psi that can burst copper, PEX, and PVC pipes. Prevention requires systematic removal of water from all plumbing systems and protection of remaining water-containing equipment.
Draining the Water Supply System
The first step is shutting off the main water supply valve and opening all faucets to drain the system. Begin with the highest fixture in the house and work downward, allowing gravity to drain water from the pipes. Open both hot and cold faucets at each fixture. After all faucets are open, drain the water heater by connecting a hose to the drain valve and opening it, then opening the temperature-pressure relief valve to allow air into the tank. Flush toilets to empty the tanks and bowls, then sponge out remaining water from the toilet bowls. Pour antifreeze approved for RV or plumbing systems into toilet bowls and drain traps to prevent freezing of residual water that cannot be removed by draining.
| System Component | Winterization Action | Critical Details |
|---|---|---|
| Main water supply | Shut off valve, drain lowest point | Leave faucets open after draining |
| Water heater | Drain completely | Open T&P valve for air entry |
| Toilets | Flush, sponge dry bowl and tank | Add RV antifreeze to bowl and tank |
| Sink and shower traps | Pour antifreeze into drains | Use RV-grade, not automotive antifreeze |
| Washing machine | Disconnect hoses, drain pump filter | Leave door open to prevent mold |
| Dishwasher | Run cycle with antifreeze | Remove and store drain hose from disposal |
Heating System Preparation
Even if the house will be unoccupied, maintaining some minimal heat is often the best protection against freezing. However, if the house will be completely unheated, the heating system itself requires winterization.
Options for Heating an Unoccupied House
The simplest approach is leaving the heating system operating at a reduced temperature setting of 50 to 55 degrees Fahrenheit. This maintains temperatures above freezing throughout the structure while minimizing energy consumption. Set back any programmable thermostats to hold this temperature constantly. If the heating system is unreliable or the house will be vacant for an entire winter, draining the heating system is necessary. For hydronic (hot water) heating systems, drain the boiler and all piping following the same principles as the domestic water system. For forced-air systems, the furnace can be shut off and left dry, but ensure the pilot light is extinguished for gas systems. ceiling insulation and attic preparation should be verified as adequate before leaving a house unheated for winter.
Structural and Exterior Preparation
The building envelope must be prepared to withstand winter weather without maintenance attention for extended periods. Exterior preparations prevent water entry, ice damage, and pest intrusion.
Roof, Gutters, and Exterior Protection
Clean all gutters and downspouts of leaves and debris to prevent ice dams from forming at the roof edge. Ensure downspouts discharge water at least 6 feet from the foundation. Trim tree branches that overhang the roof to prevent snow load damage and reduce the risk of branches falling during storms. Inspect the roof for loose or missing shingles and repair them before winter. Seal any gaps or cracks in the exterior siding, foundation, and around utility penetrations where rodents and insects could enter. Remove exterior hoses from hose bibs and shut off the water supply to exterior faucets from inside the house. Install foam insulating covers over exterior hose bibs for additional protection.
Interior Preparations
Remove perishable food from cabinets and pantry to prevent attracting pests. Clean the refrigerator and leave doors slightly open to prevent mold growth. Remove batteries from smoke and carbon monoxide detectors that will not be monitored. Set mouse traps and bait stations in areas where pests commonly enter. Place moisture-absorbing products such as DampRid in closets and enclosed spaces to control humidity during the winter months. Close and lock all windows and doors, checking that weatherstripping is intact and functioning.preventing frozen pipes through insulation strategies provides additional guidance on protecting vulnerable plumbing in exterior walls and unheated spaces.
Security and Monitoring Systems
Modern technology provides options for monitoring an unoccupied house during winter. Remote monitoring allows detection of problems before they cause significant damage.
Remote Monitoring Solutions
Install smart temperature sensors that send alerts if indoor temperatures drop below 45 degrees Fahrenheit, indicating a heating system failure. Smart water leak detectors placed near water heaters, washing machines, and under sinks provide early warning of pipe failures. Smart thermostats allow remote temperature monitoring and adjustment. For complete peace of mind, install a freeze alarm system that dials specified phone numbers if temperatures fall below a set threshold. Ensure the Wi-Fi network and internet connection remain operational, or use cellular-based monitoring systems that are independent of the home internet service. Provide a trusted neighbor or property manager with a key and emergency contact information for situations requiring immediate physical intervention.
Summary: Properly winterizing a house requires systematic attention to plumbing, heating, structural, and monitoring systems. The investment of time in thorough preparation prevents the substantial cost and disruption of repairs from freezing damage and ensures the house remains in good condition throughout the winter months.