How to Winterize Your Vacation Home or Investment Property
How to Winterize Your Vacation Home or Investment Property
If you own a vacation home, investment property, or rental unit that will be unoccupied during winter, proper winterization is essential. An unoccupied home without heat is a ticking time bomb for frozen pipes. Without anyone present to notice a burst pipe, water can flow for days or weeks before discovery, causing catastrophic damage. According to the U.S. Department of Energy (energy.gov) and the Insurance Information Institute, burst pipes in unoccupied homes cause an average of $18,000 in damage — significantly more than occupied homes because the damage goes undetected.
JDL HVAC & Plumbing Services winterizes dozens of DMV properties every fall. Here’s the comprehensive process.
Full Winterization for Unheated Properties
If the property will be completely unheated, a full winterization is necessary to remove all water from the plumbing system.
Step 1: Shut off the main water supply and water heater. Turn off the gas supply or electrical breaker to the water heater. Close the main water shut-off valve. If on well water, turn off the well pump and pressure tank.
Step 2: Drain the plumbing system. Open all faucets (hot and cold) on every floor, starting from the highest point. Flush all toilets and hold the handle to drain the tank. Open the water heater drain valve and drain completely. Open the lowest drain point in the system (often a hose bib or utility faucet).
Step 3: Blow out remaining water with compressed air. Connect an air compressor to a hose bib or drain port and blow air through the system at 40-50 PSI (no higher) to expel remaining water from horizontal pipe runs and low spots. Run air through each fixture.
Step 4: Add antifreeze to drain traps. Every fixture has a P-trap that holds water to prevent sewer gas from entering the home. Pour non-toxic RV/marine antifreeze (propylene glycol — NOT automotive antifreeze, which is toxic and will contaminate the plumbing) into each trap. Amounts per fixture are approximately 1 cup for sink and tub traps, 2 cups for toilet bowls (after flushing), 1 cup for floor drains, and 1/2 cup for washing machine and dishwasher traps.
Step 5: Address the water heater. For tank water heaters, drain completely, leave the drain valve open, and set the gas valve to PILOT (not OFF) or turn off the electric breaker. For tankless water heaters, drain and disconnect — tankless units are especially vulnerable to freeze damage.
Step 6: Winterize the HVAC system. If leaving the system on at a minimal setting, set the thermostat to 55°F — this keeps the home above freezing while minimizing energy costs. If shutting down completely, have the system professionally prepared for extended dormancy.
Minimal Winterization for Heated Properties
If you can maintain heat in the property (even minimally), the process is simpler. Set the thermostat to no lower than 55°F. Open cabinet doors under sinks on exterior walls to allow heated air to reach pipes. Set faucets on exterior walls to drip slightly during extreme cold forecasts. Insulate pipes in unheated areas (crawl spaces, attics, garages). Install a smart thermostat or temperature monitor that alerts you if the temperature drops below your setpoint.
Property Monitoring Options
| Monitoring Device | Cost | What It Does |
|---|---|---|
| Smart thermostat (Nest/Ecobee) | $150-250 | Temperature monitoring, remote control, alerts |
| Temperature sensor (Temp Stick) | $50-100 | Sends alerts if temp drops below setpoint |
| Water leak detector (Moen Flo) | $200-500 | Detects leaks and can shut off water automatically |
| Security camera with temp | $50-200 | Visual monitoring plus temperature display |
| Property management check-ins | $25-75/visit | Weekly in-person inspection |
For high-value properties, JDL HVAC recommends a combination of remote monitoring (smart thermostat with alerts) and periodic in-person checks by a property manager or neighbor.
Winterization Costs
| Service | DIY Cost | Professional Cost | Damage If Skipped |
|---|---|---|---|
| Basic winterization (heated property) | $25-50 (antifreeze, insulation) | $150-300 | $5,000-15,000 |
| Full winterization (unheated property) | $50-100 (antifreeze, supplies) | $200-500 | $10,000-50,000 |
| Spring de-winterization | $25-50 | $100-250 | N/A |
| Smart monitoring installation | $50-250 | $100-400 | Depends on alert response time |
Spring De-Winterization
When reopening the property in spring, reverse the winterization process carefully. Close all faucets and drain valves. Turn on the main water supply slowly. Check each fixture for leaks before moving to the next. Run hot water through each fixture to flush antifreeze. Flush toilets multiple times. Turn on the water heater and wait for recovery. Inspect all pipes and connections for damage. Activate the HVAC system and verify operation.
Frequently Asked Questions
What temperature should I keep an unoccupied home?
If keeping the heat on, set the thermostat to no lower than 55°F. This provides a margin above freezing while accounting for temperature variations between rooms. Pipes in exterior walls, crawl spaces, and attics may be significantly colder than the thermostat reading.
Can I winterize my property myself?
Basic winterization is a DIY-friendly project for handy homeowners. However, professional winterization is recommended for properties with complex plumbing systems, radiant heating, sprinkler systems, or homes that will be completely unheated. JDL HVAC & Plumbing ensures nothing is missed.
Will my insurance cover freeze damage in an unoccupied home?
Most policies require that you take reasonable steps to prevent freeze damage. If the home is unoccupied and you failed to winterize or maintain minimum heat, the claim may be denied. Review your policy and document your winterization steps.
How long can a house go unheated before pipes freeze?
It depends on outdoor temperature and wind chill. In a DMV winter at 20°F, exposed pipes in uninsulated areas can freeze in 4-6 hours. Well-insulated interior pipes may survive 24-48 hours at 20°F, but this is risky. Don’t gamble — winterize properly.
Does JDL offer winterization services?
Yes — JDL HVAC & Plumbing Services provides comprehensive winterization and spring de-winterization for vacation homes, investment properties, and rental units throughout the DMV. Call (844) 535-4822 to schedule.
Serving the Greater DMV Area
JDL HVAC & Plumbing Services proudly serves homeowners across Maryland, Virginia, and Washington D.C.
Maryland: Laurel | Bowie | Crofton | Upper Marlboro | Columbia | Annapolis | Odenton | Severn | Glen Burnie
Virginia: Northern Virginia | DC: Washington, DC
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