Four Sundays to Thanksgiving. Your house already picked the project.

Published October 27, 2026. If you are reading this after Thanksgiving, the four tests below still work — move each one to the four Sundays before Christmas and the framework is unchanged.

The furnace cycled on for the first time Monday night. Not the brief September test-run anybody could sleep through — the real one, forty minutes of blower, a cold front moving through from Minnesota, the thermostat finally dropping its “away” setpoint and letting the house ask for heat the way it will ask for the next five months. One of the kids woke up at 2 a.m. because the register in the hallway makes a specific tick in October that it does not make in June, and you lay there listening to it and realized three things in order: the clocks go back on Sunday, you promised your mother-in-law twelve people for Thanksgiving, and you have no idea when the furnace was last serviced.

Today is Tuesday, October 27. Thanksgiving is November 26. That is four weeks, which is also four Sundays. This post is about those four Sundays, why they are the whole decision window for a family that plans to host, and how to let the house pick the project for you — one Sunday at a time.

Why the four Sundays matter this year

Three things about the next four weeks that are specific to the fall of 2026.

The heating season starts in a national CPSC awareness window. The U.S. Consumer Product Safety Commission marks the Sunday the clocks go back as a national “check batteries and age of alarms” moment every year, because — as the agency’s Carbon Monoxide Information Center notes — CO poisoning from consumer products still kills more than 200 Americans annually, and more than 100 of those deaths are linked to portable generators. Those deaths are not off-season now: CPSC reports that more than half of CO deaths occur in November, December, January, and February. If a storm knocks the power out, CPSC’s rule is to run a portable generator outside only, at least 20 feet from the house — never on a porch or in a carport — with its exhaust pointed away from the house and any other building where someone can enter, and with any windows near it or in the path of its exhaust closed and any vent openings there sealed off. The furnace is the fuel-burning appliance that starts running every night this week. This Sunday — November 1 — is the clock-change day on the 2026 calendar. If you only do one house task between Halloween and Thanksgiving, this is the one every public safety agency in the country is quietly asking you to pick.

The HVAC trade is still booking out. The Bureau of Labor Statistics’ outlook for heating and air-conditioning technicians projects employment growing eleven percent between 2025 and 2035 — much faster than the average for all occupations — which is why the tune-up appointment you could get in a week in 2020 is now a three-week booking in most metros. If you call for a tune-up on Sunday night and the first available Saturday is November 21, you have one open window between the appointment and Thanksgiving — which is exactly how the four-Sunday calendar below is shaped.

The guest math is heavier than families remember. Twelve people in the house for a long weekend is three to four showers’ worth of hot-water draw before 10 a.m. on Thursday, two full dishwasher cycles between dinner and bedtime, a furnace running against an open front door every time somebody arrives or leaves, and — if the weather turns the way the NOAA Climate Prediction Center’s winter outlook usually suggests for the Great Lakes and Northeast in late November — a driveway that needs to be walkable in the dark by 5 p.m. The house will be asked to do, in four days, roughly what it is asked to do in a normal month. Systems that are quietly weak will say so.

Put together, those three things mean the four Sundays before Thanksgiving are not generic weekends. Each one has a specific thing the house will tell you if you listen, and each one has a specific decision you have to make before the next one begins.

The four Sundays, on the actual calendar

Sunday 1 — November 1. The clocks go back at 2 a.m. — standard time, every November’s first Sunday. The CPSC’s national alarm-check Sunday. First evening of the fall when daylight ends before dinner, for the next five months.

Sunday 2 — November 8. First full week of standard time. By now the furnace has run every night. If anything is going to make a noise it has not made before, it has made it. Youth-sports schedules are winding down; most families have one or two open hours.

Sunday 3 — November 15. Last clean weekend before guests start arriving. Grocery delivery slots for Thanksgiving week are mostly booked by Tuesday the 17th. HVAC companies are closing their Thanksgiving-week books.

Sunday 4 — November 22. The Sunday before. Family starts arriving Wednesday the 25th. Anything you want ready for guests is ready by the end of this day or it is not ready.

Thanksgiving Thursday is November 26. By then, whatever is wrong with the house is wrong with the house with twelve people in it.

Four Sundays. One test per Sunday. One decision at the end.

The framework: let the house pick

The usual family version of pre-holiday prep is a shared list that grows every Sunday and never gets scored. Clean the guest room. Fix the toilet in the half-bath. Order the turkey. Replace the floodlight. Buy the air mattress. Call about the furnace. The list is not wrong; it is just unordered, which means by Sunday 4 the half-bath toilet has had three Saturdays spent on it and the furnace has had none.

The alternative is to let the house tell you, through the four tests below, which project it is asking you to finish. Each test takes less than an hour. Each one produces a plain output — pass, pass-with-note, or fail. The one failure the house produces is the project. If there is more than one failure, the one that cascades hardest if ignored (same question as the roof/kitchen/HVAC framework) wins the week.

Sunday 1 (November 1): the clock-change ten minutes

This is the test everything else rests on, because the three Sundays after it all involve running a combustion appliance harder, and you want the house’s own warning system verified before you lean on it. (The press-the-button check for smoke and CO alarms is a monthly job on CPSC’s calendar; what the clock-change Sunday adds is the once-a-year deeper check of placement count, replace-by date, and battery.)

Walk every level. On each level, press the test button on every smoke alarm and every carbon monoxide alarm. On each unit — this is the part most people skip — turn it over and read the replace-by date printed on the back. Replace it if the date has passed, if there is no date to read, or if the unit is more than five years old for a CO alarm or ten years old for a smoke alarm. Five years is CPSC’s replacement interval for carbon monoxide alarms, half the ten years people remember for smoke alarms, and the sensors fail silently when they expire. CPSC’s fact sheet puts it this way: “Alarms have a recommended replacement age, which can be obtained from the product literature or from the manufacturer. Newer alarms have an end-of-life signal that will indicate when the alarm needs to be replaced.” An end-of-life chirp is not a low battery.

Then count: the CPSC placement rule is one CO alarm on every level of the home and one outside the sleeping areas. In a two-story family house with the furnace in the basement and bedrooms upstairs, that is three alarms, not two. Most families install fewer. A replacement unit is about $25 and the walk takes ten minutes.

The output: a count of alarms replaced (or not), a count of alarms missing (or not), and — critically — a yes/no on whether the house currently has coverage CPSC would consider complete. If the answer is no, the project this week is finishing that coverage. Not the furnace. Not the half-bath. The alarm layer, because every test after this one assumes it is working.

Sunday 2 (November 8): the furnace cycle test

By the second Sunday the furnace has run for a week of real nights. Three things to listen for and one thing to book.

Stand next to the furnace during a full cycle. Not through the vent two floors up — in the mechanical room. Listen for the ignition sequence. A healthy modern furnace lights cleanly after the inducer pre-purge, in one try, with no stutter. If it tries, fails, pauses, and tries again — or if it makes any sound you have not heard before — that is a note. If the burner lights but the blower never gives the hot smooth “steady” sound you remember from last January, that is a note. If the house smells faintly like exhaust during or just after the cycle, that is not a note; that is a stop-and-call.

Then book the annual combustion-safety inspection. CPSC urges “a yearly professional inspection of all fuel-burning home heating systems, including furnaces, boilers, fireplaces, wood stoves, water heaters, chimneys, flues and vents.” Say “including the venting” out loud when you book it — CPSC’s instruction is that the annual inspection “should include chimneys, flues, and vents for leakage and blockages by creosote or debris.” The venting is the part that fails quietly. If the first appointment the HVAC company offers you is November 21, take it. That is Sunday 3’s slot and this calendar is already shaped around it.

The output: pass, note, or fail from the cycle listen, and a confirmed appointment on or before Sunday 3. If the cycle produced a note or a fail, this week’s project is the furnace, full stop; the other two Sundays are for watching how the house responds between now and the appointment.

Sunday 3 (November 15): the hot-water stress test

The water heater runs out of hot water in a specific order. If you have the inspector appointment this day, do this test the morning before they arrive — it tells them something they would otherwise have to guess.

Run two showers back to back, then start the dishwasher on a long cycle, then wash a full load of towels on hot. Time how long until the second shower runs lukewarm. On a healthy 50-gallon tank, two long showers plus a dishwasher start is somewhere between fifty and seventy minutes before the third draw gets cold. On an undersized or sediment-heavy tank, it is thirty minutes or less. Twelve people on Thanksgiving morning is roughly three back-to-back showers plus a dishwasher, and if the test today runs cold at thirty minutes, Thursday morning runs cold at breakfast.

Three decisions come out of this test. If the tank is less than ten years old and the test ran clean past an hour, the project is a drain-and-flush — a half-hour job that any plumber will do during the inspection visit, and that removes the sediment that is quietly stealing the back half of the tank’s capacity. If the tank is between ten and twelve years and the test ran lukewarm at forty-five minutes, the project is a replacement scheduled for the week after Thanksgiving — the system will survive one more holiday but not two. If the tank is older than twelve years and the test ran cold at thirty, the project is a replacement this week; call Monday morning.

The output: a time, an age, and a decision. For a water heater, the three combinations above cover almost every real family house, and the correct action is boring every time.

Sunday 4 (November 22): the guest-flow walkthrough

Four days until guests. One hour, outside first, then inside, then down.

Walk the driveway and the front walk at 5 p.m. — the hour family will arrive on Wednesday. Any dark spot gets a floodlight bulb replaced before Tuesday. Any step with a loose board or an iced-up stain gets fixed or marked. If the forecast shows a Tuesday-night storm, the shovel, the salt, and the extension cord for the porch lights are in the garage by Monday night.

Walk the guest route inside: front door to coat closet, coat closet to half-bath, half-bath to living room, living room to dining room. Any exterior door that will not latch, any half-bath toilet that runs, any dining-room light with a dead bulb. These are things that cost ten dollars and twenty minutes each. The reason they get fixed on Sunday 4 and not on Sunday 1 is that fixing them on Sunday 1 means doing them twice — once now, once in three weeks when a kid or a visitor finds the one you missed. By this Sunday the list is actual, not speculative.

Walk the basement last. One pass with a flashlight along the floor at the base of every exterior wall and under every supply plumbing line. Any new water stain, any new rust, any new white mineral crust, any smell that is not the smell the basement had last week. This is the one Sunday 4 finding that overrides everything else: a new water stain under a supply line four days before twelve guests is the project, period.

The output: a short list of ten-dollar fixes done the same day, one pass/fail on the basement check, and — if the basement failed — a Monday-morning plumber call that beats every other item.

Reading the four results together

By 6 p.m. on Sunday 4, the four tests have produced four outputs. For most family houses that have been reasonably maintained, three of the four pass clean and one produces either a note or a project. That one is the project. Finish it between Sunday 4 and Wednesday night, let the house survive the holiday, and triage anything else that showed up — including Sunday 1’s missing alarm count — in the quieter weeks between Thanksgiving and Christmas.

The failure case the framework is actually designed for is the one where two Sundays produce real notes — the furnace cycle sounded wrong on Sunday 2 and the hot-water test ran cold at thirty minutes on Sunday 3. That is the week families get tempted to do both at once, two contractors in the house in four days, and that is the week the half-bath toilet gets ignored because the parents are coordinating two visits and reading two quotes. Pick the one that fails hardest if deferred. In almost every two-note week the answer is the furnace — because a cold shower on Thanksgiving morning is a story and a cold house with a failed heat exchanger on Thanksgiving morning is a hospital visit. Replace the water heater the week after.

The worked example

The Patels are a family of five near Pittsburgh. Three kids, parents in their forties, hosting both sets of grandparents and one brother-in-law’s family — twelve people over four days. House is a 1998 two-story, furnace in the basement, 50-gallon gas water heater in the mechanical room, two CO alarms (one by the furnace, one in the upstairs hall), three smoke alarms.

Their four Sundays:

On Nov 21, the HVAC tech confirms the inducer motor is beginning to fail. The quote: $340 for the motor, same-day install if they say yes. They say yes. The tank gets drained and flushed in the same visit — forty-five extra minutes, $80. The furnace runs quietly through Thanksgiving morning. The second shower on Thursday is warm. Nobody notices the house. That is the goal.

The project the Patels did not do: finish the basement workshop that has been “almost done” since July. It is on the January list. The holiday was the four Sundays and the four Sundays only.

What to do this week

Three things, before Sunday.

Put the four Sundays on the shared calendar. Not a to-do list, four calendar events: 10 a.m. Sunday Nov 1, Nov 8, Nov 15, Nov 22, 60 minutes each. Both parents. The calendar invite is doing one job: making the test the default use of the hour, instead of a thing that has to be decided every week.

Buy the replacement alarms now, not on Sunday. Three CO alarms and three smoke alarms is about $150 at a hardware store on Thursday. Buying them on Sunday morning turns a 10-minute walk into a 90-minute errand, and the walk is the thing that has to happen.

Save the HVAC company’s number in both parents’ phones. On Sunday 2, the person who walks downstairs to the furnace is the one who calls. If that is a parent who did not save the number in August, Sunday 2’s hour becomes “find the number,” and the appointment that should have been booked on Nov 8 gets booked on Nov 12 and lands after Thanksgiving.

The four Sundays will happen whether you use them or not. If you use them this way, the house will tell you — on its own schedule, in its own order — the one project that genuinely has to be finished before twelve people walk through the door. If you do not, you will find the project at 7 a.m. Thanksgiving morning, in the dark, with the first grandparent already in the driveway.

Pick the four Sundays. Let the house pick the project.