The short version
There are two defensible plans for an unoccupied building in a Vermont winter: keep it heated and monitored, or drain the water system entirely. The expensive outcome is the third one, where the heat is left on with nobody watching and a failure runs undiscovered for days. Draining the system completely removes the risk, not managing it, but it has to be done completely: every water-using system identified and addressed, including the water heater with its power switched off first. Choosing neither, and hoping a mild winter will carry the building through, is what actually produces the expensive outcome.
Quick answer
Pick one: keep the building heated with remote temperature monitoring, or drain the water system completely. Leaving the heat on with nobody checking is not a plan. It is the arrangement in which a failure runs for a week before anyone notices, which is how a repair becomes a rebuild.
Option one: keep it heated, and know when it stops
Keeping heat on is the simpler option and it works, provided you would find out promptly if it stopped. The monitoring is the part people leave out, and it is the part that matters. A heating failure at an empty building is only expensive because of how long it runs undetected. A temperature sensor that alerts you while the building is still at 5°C turns a burst-pipe event into a service call.
- A remote temperature sensor with alerting, checked to actually work before you leave
- A thermostat setback no lower than the plumbing can tolerate. The setting should protect pipes, not just the fabric
- Interior doors left open so heat reaches rooms with plumbing on exterior walls
- Cabinet doors open under sinks on outside walls
- A local contact with keys who can get there, and who knows where the shutoff is
- Fuel level confirmed adequate for the whole period away
| Plan | Requires |
|---|---|
| Keep it heated | Monitored sensor with real alerting, a local contact |
| Drain it completely | Every system emptied, water heater power off first |
Option two: drain it properly
Draining removes the risk instead of managing it, and for a genuinely seasonal building it is usually the right answer. It is also more than turning off a valve and opening taps: water sits in traps, in the water heater, in the pump and pressure tank on a well system, and in appliance lines. A partial drain can be worse than none, because it produces confidence without protection.
- Water supply off at the main, and the system drained from the lowest point
- Water heater switched off at its power or fuel FIRST, then drained: draining an energised tank destroys the element or burner
- Traps protected, since an empty trap also lets sewer gas into the building
- Well pump and pressure tank drained on private systems
- Dishwasher, washing machine and ice-maker lines cleared
- Toilet tanks and bowls emptied
The water heater sequence is the one most often got wrong and it is the most expensive: power or fuel off first, then drain. An element firing into an empty tank fails within minutes.
What changes if the building is on a well or septic
A private well adds the pump, the pressure tank and the buried line between them and the building to everything above. A septic system is generally more tolerant of a season unused, but the tank's condition when you left is the condition you return to. A tank close to needing a pump-out does not improve over the winter.
For landlords and second-home owners with a vacant property
If someone else holds the keys, write the plan down and give it to them. Which option you chose, where the shutoff is, where the drain points are, what the thermostat should read, and who to call. The failure mode at a managed property is rarely that nobody could act. It is that the person on site did not know what the plan was or where the valve is.
Common questions
What temperature should I leave an empty Vermont house at?
High enough that plumbing in the coldest part of the building stays above freezing, which is warmer than the coldest room's reading suggests because pipes sit in wall cavities and crawlspaces colder than room air. Interior doors open and a monitored sensor matter as much as the number on the thermostat.
Is draining always better than heating?
For a building that will be empty all season and has no other reason to stay warm, usually yes: it removes the risk instead of managing it. For a building used intermittently, or where contents need protecting from damp and cold, heating with monitoring is generally more practical.
Can I use antifreeze in the plumbing?
Non-toxic plumbing antifreeze is used in traps and some systems as part of a winterization, but it is a component of a proper drain-down, not a substitute for one. Never use automotive antifreeze in plumbing.
How quickly can pipes freeze in an unheated Vermont building?
Faster than most people expect once indoor temperature falls below freezing, and fastest in pipes on exterior walls, in crawlspaces and in unheated additions. It depends on outdoor temperature, wind and the building, which is exactly why monitoring beats estimating.
What should a landlord or second-home owner give the person holding the keys?
Give them a written plan. State which option you chose. Say where the shutoff is and where the drain points are. Say what the thermostat should read and who to call. The failure at a managed property is rarely that nobody could act. It is that the person on site did not know the plan or where the valve is.