Heating demand in New Brunswick starts showing up in September, the first month when the average daily temperature dips below the 18°C mark used to calculate heating degree days. The season then runs nearly ten months, tapering off only in July when the mean climbs back above that threshold. January carries the heaviest load, at 832 degree-days.
When the heating season starts in New Brunswick
That September start date isn’t a guess. It comes from Environment and Climate Change Canada’s 30-year climate normals for the Moncton A station, which track how far below 18°C the average daily temperature falls, month by month, then add up the shortfall into “degree-days.” Whenever a month’s normal mean temperature drops under that 18°C line, it counts toward the heating total. September is the first month that crosses it, with a normal mean of 13.6°C.
What that means for a household is simple: by early fall, most homes across the province are already calling on their furnace, heat pump, or baseboards more mornings than not. The season builds through the fall, peaks in January at 832 degree-days, and only lets up once July’s warmth pushes the average back above the base.
One thing worth saying plainly: a monthly normal is a 30-year average, not a forecast for any single year. The first genuinely cold night in a given September could land well before, or after, what the normal suggests. Treat the month as a planning window, not a date on the calendar.
Here’s the monthly breakdown, in heating degree-days below 18°C, from the Moncton A station:
| Month | Heating degree-days (below 18°C) |
|---|---|
| January | 832 |
| February | 722 |
| March | 648 |
| April | 434 |
| May | 248 |
| June | 98 |
| July | 24 |
| August | 36 |
| September | 139 |
| October | 322 |
| November | 484 |
| December | 707 |
Notice that even July and August carry a small number. That’s the nature of a maritime climate: nights stay cool enough, often enough, that the heating tally never fully disappears. It’s the table’s shape, not just its length, that tells the real story of a New Brunswick winter.
How hard the winter works here
Add up those twelve monthly figures and New Brunswick lands at roughly 4,696 heating degree-days a year below 18°C, based on the same Moncton A climate normals. Degree-days work as a rough stand-in for fuel use: a house that needs to make up 4,696 degree-days a year is, broadly speaking, burning about twice the fuel of a similar house in a climate with 2,300 degree-days, all else being equal.
What the annual number alone doesn’t reveal is the shape of the season, and that’s exactly why the monthly table above matters. Two territories can post the same yearly total in very different ways: one might spread it thin over a long, mild season, while another crams most of it into three brutal months. New Brunswick’s tally builds gradually from September, peaks hard in January, and eases off slowly through spring, meaning the furnace or heat pump is doing meaningful work for most of the year rather than idling for eight months and sprinting for four.
This isn’t a figure to stack against a heating season south of the border. Canadian degree-days are counted on an 18°C base over the 1981-2010 period; American figures use 65°F and a 1991-2020 window. The math behind each is different enough that lining them up side by side tells you nothing true about either place.
What most homes in New Brunswick actually heat with
Statistics Canada’s 2023 survey on primary heating systems gives a clear picture of what’s actually installed across the province, even if it doesn’t say what’s best for any one house:
| Heating system | Share of homes |
|---|---|
| Electric baseboard heaters | 31% |
| Heat pump | 27% |
| Forced-air furnace | 9% |
| Boiler with hot-water or steam radiators | not reported |
| Heating stove | not reported |
A share of installations reflects what was cheap and available when the housing stock went up, not a verdict on what performs best today. Electric baseboards edge out every other category, which tracks with decades of relatively affordable electricity and a lot of housing built before heat pumps were common. Baseboards are simple, cheap to install, and nearly maintenance-free, but they heat a room directly rather than moving air, so they can leave a house feeling unevenly warm and they offer no cooling in summer.
Heat pumps, at 27%, have clearly been catching on, likely as a supplement or replacement in homes originally wired for baseboards. They’re efficient in shoulder-season temperatures but lose some of that edge on the coldest January nights, which is why many households pair one with a backup source rather than relying on it alone.
Where “not reported” appears for boilers and heating stoves, that’s not the same as zero. Statistics Canada suppresses estimates it judges too small or unreliable to publish with confidence, not categories with no households in them at all. If your home runs on a boiler or a wood stove, you’re not missing from the data, just folded into a number too thin to print. For anyone weighing wood heat specifically, that’s a separate conversation worth having on its own terms rather than folding into this one.
Run it once before you need it
The worst time to find out a heating system needs a repair is the first genuinely cold night of the year, when every technician in the province already has a full book. The fix is to run the system once, on purpose, before you need it, ideally sometime around September when the degree-day count starts climbing. Work through the check in this order, since the earliest steps catch the most common problems and cost the least:
- Turn the thermostat down, then up past the current room temperature, and let the system run a short cycle while you listen for banging, rattling, or a burner that struggles to catch.
- Expect a faint burnt-dust smell in the first few minutes. That’s normal, it’s just summer dust burning off a furnace’s heat exchanger or a baseboard’s element, and it should fade quickly.
- Check and, if needed, replace the furnace filter. A clogged filter restricts airflow, forces the system to work harder, and is one of the cheapest things in the house to fix.
- Walk the house and clear space around vents, radiators, or the outdoor unit of a heat pump. Furniture pushed against a vent, or leaves packed around an outdoor unit, quietly cuts output all winter.
- Test the carbon monoxide alarm. Any fuel-burning system, furnace, boiler, or stove, can produce carbon monoxide if something’s off, and a working alarm is the cheapest insurance in the house.
- If the system won’t hold a cycle, trips a breaker, or the smell doesn’t clear, stop and call a technician before the season gets busy rather than after.
Even a furnace in perfect working order can lose plenty of its output before it ever reaches a room. According to the U.S. Department of Energy, “in a typical house, about 20%-30% of the air that moves through the duct system is lost due to leaks, holes, and poorly connected ducts.” That’s not a verdict on New Brunswick homes specifically, but it’s a reasonable reason to have ductwork checked at the same time as the furnace itself, especially in an older house.
What turning it down is actually worth
The U.S. Department of Energy puts a number on the payoff of backing off the thermostat: “You can save as much as 10% a year on heating and cooling by simply turning your thermostat back 7-10°F for 8 hours a day from its normal setting.” That figure is a yearly total for a specific setback held over a specific stretch of hours, not a per-degree rule, and it covers both heating and cooling combined.
In a place where the heating season stretches close to ten months, that 8-hour window has a lot more hours to work with over the course of a year than it would somewhere with a short, mild winter. A setback used overnight, or during a workday when nobody’s home, adds up across a season that’s already running from September through spring.
The savings figure doesn’t change based on how cold it gets outside, since it’s tied to the setback and the hours held, not the local climate. What changes is how many days a year that setback actually gets used, and in New Brunswick, the answer is most of them.