Winterization is the most cost-critical preservation task for vacant properties. A single burst pipe can cause tens of thousands of dollars in damage — flooded floors, destroyed drywall, mold growth, and structural compromise. Proper winterization protects plumbing, HVAC, and water-connected systems from freeze damage during cold months.
When to Winterize
Most investors and servicers require winterization to be completed by November 1 for northern states and December 1 for southern states, though specific dates vary by investor and region. Properties should be winterized whenever they will be vacant and without heat during months where temperatures may drop below freezing — even in southern states, overnight freezes can burst unprotected pipes.
Step-by-Step Winterization Process
1. Shut Off Water Supply
Locate and shut off the main water supply valve. For properties on well water, turn off the well pump at the breaker. Open the lowest faucet in the home to relieve pressure and allow the system to begin draining.
2. Drain All Water Lines
Open all faucets (hot and cold) and flush all toilets. Use an air compressor to blow remaining water from supply lines — start from the highest point in the system and work down. Pay special attention to horizontal runs and low points where water collects. Drain the water heater completely through the drain valve at the bottom of the tank.
3. Treat Drain Traps and Toilets
Pour non-toxic RV antifreeze into all drain traps — every sink, tub, shower, floor drain, and washing machine standpipe. Add antifreeze to all toilet bowls and tanks after flushing. This prevents the trap water from freezing and cracking porcelain or drain fittings.
4. HVAC and Mechanical Systems
If the property will have power, set the thermostat to 55°F as a secondary freeze protection measure. If utilities will be disconnected, ensure all water is removed from boiler systems, hydronic heating loops, and humidifier lines. Disconnect and drain washing machine hoses. Cap or plug dishwasher and ice maker supply lines.
Documentation Requirements
Photo-document every step of the winterization process: the main shutoff valve in closed position, each faucet open, the water heater drain, antifreeze in each trap and toilet, thermostat setting, and any damage or conditions found during the process. Include the property address and date in your documentation. Incomplete winterization documentation is a common chargeback trigger.
Ethreon provides winterization services with full photo documentation across our multi-state coverage area. Contact us before winter to schedule winterization for your vacant property portfolio.
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Frequently Asked Questions
1When should a vacant property be winterized?
Most investors require winterization by November 1 in northern states and December 1 in southern states, though dates vary by investor and region. Any vacant property without heat should be winterized before temperatures drop below freezing.
2What does property winterization involve?
Winterization includes shutting off the water supply, draining all water lines with an air compressor, treating drain traps and toilets with non-toxic antifreeze, draining the water heater, and protecting HVAC and mechanical systems from freeze damage.
3How do you protect pipes from freezing in a vacant property?
Shut off the main water supply, open all faucets, and use an air compressor to blow remaining water from supply lines starting at the highest point. Pour non-toxic RV antifreeze into all drain traps, toilet bowls, and tanks.
4How is HVAC winterized in a vacant property?
If the property has power, set the thermostat to 55 degrees as secondary freeze protection. If utilities will be disconnected, drain all water from boiler systems, hydronic heating loops, and humidifier lines. Disconnect and drain washing machine hoses.
5How much does it cost to winterize a vacant property?
Winterization costs vary by property size and complexity but are typically governed by investor allowable amounts for the specific service. The cost of winterization is far less than the tens of thousands in damage a single burst pipe can cause.