How to winterize a Sun Valley second home: what fails while you're away

If you own a second home in Sun Valley or Ketchum, winterizing it is the most important maintenance of the year. In the Wood River Valley, the first hard freeze can show up in early October. A house that sits empty when it does is exposed to the expensive failures: burst pipes, a boiler that won’t relight, ice dams, water running down the inside of a wall. Most of it is preventable, and almost all of it comes down to doing ordinary work on time and then checking it again.

How we winterize a vacation home

Here’s what we cover on every home before winter.

Water first

Most serious winter damage starts with water, so we deal with it before anything else.

Disconnect every hose. This is the one people skip. A frost-free spigot only works if it can drain. Leave a hose attached and water stays trapped in the valve, which sits inside your wall. When it freezes, the pipe splits indoors, and you may not find out until the next thaw floods the room.
Blow out the irrigation. Compressed air through every zone, then the backflow preventer drained and protected.
Know where the main shutoff is, and make sure it works. A shutoff valve that hasn’t been turned in ten years often won’t turn when you need it.
Install leak detection. Sensors under sinks, behind appliances, and next to the water heater and boiler, ideally paired with an automatic shutoff valve that closes the main when it detects a leak.

Then heat

An empty house in January is only as safe as its heating system.

Have the HVAC professionally serviced and tested. Not just turned on, but inspected by someone qualified before you need it.
Change the filters. A clogged filter makes the system work harder and can cause it to shut down.
Run, test, and clean the boiler. Burner cleaned, safety controls tested, pressure and glycol levels checked. We run it under real load before the cold arrives, not after.
Check everything else that makes heat. Fireplaces and chimneys, radiant floors, garage and crawlspace heaters, and any backup heat source.
Test backup power. Many homes now come with backup power sources, including plumbed gas generators and other systems. Make sure that that system is functioning 10 out of 10 before the winter season.
Set a sensible minimum temperature for when the house is empty, usually around 55°F, and confirm that low-temperature alerts actually reach a person.

Snow and ice

Heat tape. Test every run on roof edges, gutters, and pipes that pass through exterior walls or crawlspaces. Heat tape fails quietly, and you find out when an ice dam forms.
Snowmelt systems. Check that the boiler or controller fires, sensors respond, and glycol is at the right concentration. A snowmelt drive that doesn’t melt is just an expensive slab.
Snow removal in writing. Confirm the contract covers the driveway, walkways, decks, and the roof, along with how much accumulation triggers a visit.

Gutters and drainage, more than once

This is where we see the most damage from “set it and forget it.”

Most homes get their gutters cleaned once in the fall. A week later, the last of the aspen and cottonwood leaves come down, and the gutters are full again. Water that can’t drain backs up under the roof edge, runs down the siding, freezes into ice dams, and in the worst cases makes its way inside.

So we don’t treat gutters as a one-time task. We check them on every visit through leaf drop and clear them again as needed. We also audit drainage around the house: downspouts discharging away from the foundation, window wells clear, grading that sends water away from the house, and drains that aren’t clogged or buried.

Lights, before it gets dark

Audit all exterior and landscape lighting in early fall. Once the days get short and the snow comes, nobody wants to dig out a landscape light or chase a dead circuit in the dark. Lights on timers also make an empty house look occupied, so it’s worth getting them right.

While we’re at it, we test smoke and carbon monoxide detectors and replace batteries.

The part a checklist can’t cover

Everything above is a list, and lists are useful. But winterizing isn’t a one-day job you finish in October. Gutters refill. Heat tape trips. A storm takes out power for six hours. A house stays safe through winter because someone is checking it regularly and knows what normal looks like, so they notice when something isn’t.

That’s the job. It’s also why we don’t treat any of this as a one-time list. More on that in why we don’t stop at the checklist.

HDLO provides home watch and property management for second homes in Sun Valley, Ketchum, and the Wood River Valley. See what’s included or request a walkthrough.