Closing a Seasonal Home for Winter: 4 Steps to Prevent Damage

TL;DR: Shut off the main water, drain all pipes and fixtures, set thermostats to 50–55°F (or drain the heating system entirely if going dark), seal entry points against pests, and arrange a monthly check-in with a neighbor or property manager. A single frozen pipe can cause $10,000+ in water damage; most burst 2–4 weeks after the home is vacated.

_Last reviewed: July 2026 · 6 min read_

Seasonal homes in lake country, mountain towns, and snow-belt states sit empty 4–7 months a year. Most damage happens during those vacant months—frozen pipes, mold from trapped moisture, animals nesting in crawl spaces—and insurance pays out only if you took reasonable precautions. The checklist below walks through plumbing, HVAC, pest exclusion, and safety steps that hold up whether you're closing a cabin in Maine or a beach house in the Outer Banks.

Okoniq Property Hub logs every winterization task with photos and completion dates, so you have timestamped proof you drained the water heater, sealed the chimney damper, and set the thermostat—documentation that matters if a claim goes sideways.

Should you shut off water completely or leave heat on low?

Shut off the main water supply at the street or well-pump breaker, then open every faucet (hot and cold), flush toilets until tanks empty, and pour RV antifreeze into all drain traps—kitchen sink, bathroom sinks, tub, shower, floor drains, washing-machine standpipe. If you leave baseboard heaters running at 50°F to protect furniture and drywall, you still drain the water system; antifreeze in the traps prevents sewer gas from entering through dry P-traps. If the home has forced-air heat and you're confident the furnace will run reliably all winter, you may leave water on with a continuous 55°F thermostat setting and a WiFi leak detector on the floor near the water heater—but most owners in sub-freezing climates drain everything and sleep better.

Water heaters need special attention. Turn off the gas or breaker, attach a garden hose to the drain valve at the bottom, and run the hose outside or to a floor drain. Open the pressure-relief valve at the top to let air in, then open the drain—expect 40–80 gallons depending on tank size. Once empty, leave the drain valve open and the pressure-relief valve open so any residual water can escape. Don't skip this; a frozen water heater will split the tank and flood the mechanical room when it thaws.

For homes with well pumps, flip the breaker to the pump and the pressure tank, then drain the pressure tank using the valve at its base. In crawl-space or basement installations, open the petcock on the pump itself and let any trapped water drip out. Covering the pressure tank with an insulated blanket adds a layer of protection if you're on the fence about draining.

How do you protect the heating system during vacancy?

If you're leaving gas or oil heat on at 50–55°F, schedule a boiler maintenance visit before you leave—check the flame sensor, replace the air filter, confirm the thermostat batteries are fresh, and test the circulator pump. Install a WiFi thermostat that sends alerts if indoor temperature drops below 45°F; many burst-pipe claims trace back to a furnace that quit in week three and no one knew until spring. Leave a house key with a neighbor or local handyman who can restart the system if the alert fires.

If you're going dark (no heat, fully drained), drain the boiler and all radiator loops or force the baseboard system using an air compressor at the fill valve. Hydronic systems hold 15–50 gallons depending on house size; water left in cast-iron radiators will freeze, crack the sections, and require $2,000–$5,000 in replacement parts and labor. For forced-air furnaces without water coils, simply turn off the gas or oil supply, flip the breaker, and replace the air filter so dust doesn't cake inside over five months.

Heat pumps and mini-splits should be powered off at the breaker. If you leave them energized in heating mode, a multi-day power outage in January can let the indoor coil freeze, crack refrigerant lines, and void the warranty. Better to shut down entirely and rely on a neighbor's visual check than gamble on unattended electronics.

What pests are you keeping out and how?

Mice, squirrels, raccoons, and bats look for warm, quiet shelter in November and December. Walk the exterior and seal any gap wider than ¼ inch—common entry points include dryer-vent terminations without flaps, bathroom exhaust fan caps with broken louvers, gaps where utilities enter the foundation, torn soffit screens, and uncapped chimneys. Use ¼-inch galvanized hardware cloth (not chicken wire, which mice chew through) or copper mesh stuffed into holes, then cover with expanding foam or mortar. If you have a wood-burning fireplace, install a stainless-steel chimney cap with mesh sides; it keeps animals out and prevents rain from pooling on the smoke shelf.

Inside, remove all food—dry goods, spices, pet food, anything in cardboard or paper bags. Even a box of crackers in the back of a cupboard will draw rodents. If you must leave pantry staples, transfer them into metal or thick-plastic bins with latching lids. Set a dozen snap traps in the basement, attic, and under kitchen and bathroom sinks as a precaution. Check them during any mid-winter visit and reset if needed.

Inspect the attic for signs of prior animal entry—droppings, chewed insulation, torn vapor barrier. If you find evidence of bats, address it before closing; they roost in colonies and a summer eviction is easier than a winter surprise. For chipmunks and squirrels, check eaves and gable vents for holes; replace damaged screens before you leave.

How do you handle appliances and water-using fixtures?

Refrigerators left plugged in without food inside will run all winter and cost $30–$50 in electricity for no reason. Empty it, prop the doors open with a balled-up towel (prevents mildew smell), and unplug. If you have an ice maker, turn off its water supply valve (usually behind or under the fridge) and disconnect the copper or plastic supply line, then blow it out with compressed air so residual water doesn't freeze and crack the tubing.

Washing machines need the hot and cold hoses disconnected at the wall valves. Open both valves briefly to confirm they're off, then unscrew the hoses, hold them over a bucket, and let water drain. Tip the washer forward slightly to drain the pump and any water in the tub's lowest point. Pour a cup of RV antifreeze into the drum and run a short spin cycle (if you still have water pressure—if not, just leave the antifreeze in the drum). Dishwashers follow the same logic: disconnect the water supply under the sink, run a drain cycle if possible, then pour antifreeze into the sump at the bottom.

For toilets, flush once after the main water is off to empty the tank, then pour antifreeze into both the tank and the bowl (two separate reservoirs). The bowl holds about a quart; the tank usually needs two cups. Antifreeze prevents the rubber flapper and fill valve from freezing and cracking. If you have a septic system, confirm the antifreeze you're using is septic-safe (propylene-glycol RV antifreeze, not automotive ethylene-glycol).

Humidifiers on forced-air furnaces should be turned off at their control panel and drained. Standing water in the reservoir tray will grow mold over five months. AC condensate drain lines in basements or crawl spaces should be blown out with a shop vac or air compressor so the P-trap doesn't hold stagnant water.

Should you leave interior doors open or closed?

Open—especially closet doors, bathroom doors, and cabinet doors under sinks. Air circulation reduces humidity pockets that encourage mold on leather, fabric, and drywall. If you're leaving heat on low, open doors let warm air reach every room and prevent cold corners. Closets with exterior walls are the worst offenders; a closed closet at 40°F when the rest of the house is 55°F creates a condensation zone on the back wall. Pull stored items a few inches away from exterior walls so air can move behind them.

If you're in a humid climate (coastal Carolinas, Gulf states) and not running heat, consider a whole-house dehumidifier set to 50% relative humidity with a condensate pump to an exterior drain. The upfront cost is $1,200–$2,000 installed, but it prevents the musty-attic and mildewed-upholstery problems that plague vacant homes in the Southeast. If that's out of budget, open a few windows a crack (with dowel rods in the tracks for security) to allow passive ventilation, and check the attic for proper soffit-and-ridge airflow before you leave.

FAQ

How often should someone check on a closed seasonal home?

Once a month minimum—ideally every two weeks in January and February when freeze risk peaks. The checker should walk every room, look for water stains on ceilings and around windows, confirm the thermostat is holding temperature if heat is on, check traps for pests, and smell for gas or mildew. A 15-minute visit catches 90% of problems before they become insurance claims.

Can you leave a car parked in the garage all winter?

Yes, but fill the gas tank to the top (prevents condensation in the tank), add fuel stabilizer, disconnect the battery or attach a trickle charger, and inflate the tires to the upper end of the recommended range. Cover the car with a breathable cloth cover, not a tarp, which traps moisture. If mice are common in your area, set traps around the garage and do not leave food or paper inside the car.

Do you need to drain outdoor faucets and sprinkler systems?

Yes—shut off the interior valve to each outdoor faucet, open the faucet outside, and let it drain. If the faucet is a frost-free sillcock, leave the handle open all winter. For in-ground sprinkler systems, hire a company with an air compressor to blow out all zones; residual water in PVC laterals will freeze and crack pipes 18 inches underground, requiring spring excavation and repair at $800–$2,000 per zone.

What's the best thermostat setting for an unoccupied home in winter?

Fifty to fifty-five degrees if you're leaving heat on, which protects plumbing, wood floors, and furniture but costs $150–$400 per month in gas or oil depending on insulation and square footage. Below 50°F, drywall joints can crack and latex paint can degrade. If you drain all water and turn heat off entirely, set the thermostat to its lowest setting (usually 40–45°F as a safety floor) or turn the system off at the breaker—but only if you're confident no water remains in any fixture or pipe.

Should you unplug all electronics and turn off breakers?

Unplug TVs, microwaves, computers, and chargers—phantom draw adds up over five months, and a power surge from a winter lightning strike can fry anything plugged in. Leave the refrigerator breaker off if the fridge is empty and unplugged. Keep the breaker on for any hardwired systems you're monitoring remotely (WiFi thermostat, leak detector, security camera). If you're going fully dark, turn off the main breaker but leave the well-pump and septic-system breakers off individually so you don't lose their settings.

This is educational information, not legal or insurance advice. Consult your homeowner's policy for specific winterization requirements—many insurers mandate heat above 50°F or daily checks if the home is vacant more than 30 consecutive days.