When the heat fails and nobody is home
In a year-round house, a broken furnace is an inconvenience. In a Hamptons house that empties out from October to May, it is a plumbing emergency waiting to happen: pipes freeze, split, and thaw into a flooded house weeks before anyone finds it. Almost everything in this guide follows from that one fact, and none of it is complicated once you know what to check.
What your insurance actually expects
Homeowner policies do not ban leaving a house empty for the winter, but most condition frozen-pipe coverage on "reasonable care," and that phrase is usually read one of two ways: keep the house at or above 55°F, or shut the water off and drain the system completely. A 2024 New York court case turned on precisely that 55°F fact pattern, and insurers have pointed to unusually low winter utility bills as evidence the heat was actually off when a pipe burst. Neither of those readings is a statute — it is contract language and case law, so read your own policy's wording rather than assume — but the pattern is consistent enough on the South Fork that every contractor we send you to will ask which of the two you are doing before they leave for the season.
Monitoring: the cheap insurance
A Wi-Fi-connected temperature and freeze alarm starts at about $25 for a basic device; some cloud-connected models add a $5–10 monthly subscription, others are subscription-free, and several are rated to sense down to -40°F. Set up right, it alerts you, a property manager and a local contractor by app, email or text the moment the house drops below a threshold you set — which, if the furnace fails on a Tuesday in January, is the difference between a repair bill and a flooded basement discovered at Easter. This is the least expensive line item in this entire guide and the one with the worst consequences for skipping it.
Power is the other half of the problem
None of this works without electricity. A heat pump cannot run without power, a gas or oil boiler's circulator and controls cannot run without power, and neither can your monitoring system. Long Island's power grid is not exotic in this regard, but it is not immune either: Tropical Storm Isaias, in August 2020, knocked out roughly 645,000 PSEG Long Island customers at its peak, and full restoration took 8 days. That is the event East End second-home owners point to when they explain why they monitor remotely rather than trust the thermostat. We have not found published figures on backup-generator sizing or cost for a Hamptons house, so we do not print one here; ask a licensed electrician for a whole-house or panel-transfer quote sized to your heating system specifically, not a generic number from another climate.
What a no-heat call actually costs
If the heat fails and a contractor can get to the house, the visit itself runs $75–250 nationally (most often $89–149; after-hours, weekend or storm-season calls $125–400, with some companies applying a minimum as high as $500). The parts that most often cause a January no-heat call are not expensive on their own: a furnace ignitor is $100–250, an inducer motor $400–1,100, a heat exchanger $100–200 to repair or $500–1,500 to replace, a boiler circulator pump $300–1,100, and a zone valve $100–500. A failed control board runs $300–1,400, most often $450–900. None of that approaches the cost of a burst pipe, which is the entire point of the monitoring section above.
If the existing system is old enough that the visit turns into a replacement conversation, a dual-fuel setup — a heat pump that carries most of the season with the existing boiler or furnace kept for the coldest nights — avoids relying on expensive electric-resistance backup (roughly $81 per million Btu at Long Island's electric rates, against about $32 for the heat pump itself) and gives a house with an unreliable single system a second way to make heat. That is a bigger decision than this guide covers; see our heat pump guide for the full economics.
The closing-up checklist
Do this at the fall service visit, not the week the house empties out.
- Fall heating tune-up completed, and any deferred repair actually done, not scheduled for spring.
- Thermostat decision made and documented: either the house stays at or above 55°F on a system you trust to keep running, or the water is shut off and the system fully drained. Pick one, in writing, for your own insurance file.
- Wi-Fi freeze alarm installed, tested, and sending alerts to at least two people, one of them local.
- Filters changed, condensate drains cleared, and the outdoor unit's coil clean going into winter.
- A local contractor's name and number on file before the first cold snap, not searched for during one.
Reopening in spring
Reverse the checklist and add the spring cooling tune-up before the first hot weekend. Contractors book solid the week of the first 90-degree day, and a system that sat all winter deserves a check before it is asked to run flat out.
What we could not find
A Suffolk County-specific figure for how often second homes actually file frozen-pipe claims: insurers do not publish that by town, and we have not invented one. Generator sizing or installed cost for a typical Hamptons house, which needs a site-specific electrician's quote, not a national number. And a documented average repair-response time during a widespread outage; the Isaias numbers describe the outage itself, not how long homeowners waited for a technician afterward.
Questions to ask before the house closes for the season
- Are you keeping the house at 55°F or draining the system, and does your policy's language match that plan?
- Who receives the freeze-alarm alerts besides you, and has a test alert actually been sent and received?
- If the heat fails during a storm-driven outage, what happens first: does the system have any backup, and who do you call?
- Is there a written record of the fall tune-up and the closing checklist, dated, for an insurance claim if one is ever needed?
Sources and method
Compiled 26 August 2026 from Cozen O'Connor's Property Insurance Law Observer on the 2024 New York freeze-damage case, SmartHomeExplorer's 2026 Wi-Fi freeze-alarm roundup, LIPA's Tropical Storm Isaias 30-day report, and the national repair-cost sources (Housecall Pro, HomeGuide, Angi) used across our repair and maintenance pages. Full citations and confidence ratings are in ops/research/hvac-facts-2026-08-25.md, rows A.1–2, A.11, A.13–17, D.15–17, F.2. Not published on purpose: Hamptons-specific frozen-pipe claim frequency, generator sizing and cost, and storm-season repair response times; none of it is in our source sheet, so none of it is here. Reviewed and updated as costs and guidance change.