Why is my New Brunswick home cold even with the heat turned up? | Insulation IQ?

If your New Brunswick home feels cold despite the thermostat being cranked up, the problem almost certainly isn't your furnace — it's your building envelope. New Brunswick's Climate Zone 6 winters are harsh, with Fredericton regularly dipping below -25°C and Saint John and Moncton experiencing sustained cold snaps that expose every weakness in a home's thermal defence. Heat doesn't just disappear; it escapes through specific, identifiable pathways, and understanding those pathways is the first step to actually solving the problem.

The single most common culprit is inadequate attic insulation. Heat rises, and if your attic doesn't meet the minimum R-50 to R-60 value recommended for New Brunswick's climate, warmth is streaming out through your ceiling around the clock. Many older homes in Fredericton, Moncton, and the surrounding rural areas were built to standards that called for only R-20 to R-28 in the attic — values that were considered acceptable decades ago but are now woefully insufficient by today's codes and energy realities. If you can see or touch your attic joists from above, you almost certainly need more insulation.

Beyond the attic, air leakage is frequently the hidden villain. Insulation slows conductive heat loss, but it does relatively little to stop air movement. Cold outside air infiltrating through gaps around pot lights, attic hatches, electrical boxes, plumbing penetrations, and rim joists creates a constant stream of chilled air that no furnace can fully overcome. In an older New Brunswick home, total air leakage can be equivalent to leaving a window wide open all winter. A blower door test performed by an energy auditor will quantify exactly how leaky your home is and pinpoint the worst offenders.

Rim joists — the band of framing where your floor system meets the foundation wall — are chronically under-insulated in homes across New Brunswick. These narrow cavities are often filled with nothing more than fibreglass batts that have pulled away from the framing, leaving cold air channels running directly against the foundation. Spray foam applied to rim joists is one of the highest-return insulation upgrades available, often costing $800 to $2,000 for a typical home and delivering immediate comfort improvement.

Wall insulation is another factor, particularly in homes built before the 1980s. Pre-1970 construction in New Brunswick sometimes has little to no cavity insulation at all, meaning exterior walls act almost like thermal fins, shedding heat directly into the cold. Even well-insulated walls can suffer from thermal bridging through wood studs, which have an R-value of only about R-1 per inch — far lower than the surrounding insulation material.

Basement and crawlspace insulation also plays a major role. An uninsulated or poorly insulated basement foundation wall can pull enormous amounts of heat out of the floor above, making ground-floor rooms perpetually cold. The NB Building Code recommends R-20 to R-24 for basement walls, but many homes fall far short of this.

Finally, consider your windows and doors. Even with excellent insulation, single-pane windows or poorly sealed door frames create radiant cold surfaces and air infiltration points that make nearby spaces uncomfortable regardless of air temperature.

The good news is that most of these issues are fixable, and NB Power's home energy efficiency programs and the Canada Greener Homes Grant (up to $5,600 in rebates) can offset a meaningful portion of the upgrade costs. Getting a professional energy audit — which NB Power subsidizes — gives you a prioritized roadmap rather than guesswork.

For guidance on identifying where your home is losing heat and which upgrades will deliver the best comfort and energy savings, the professionals listed on New Brunswick Insulation can assess your specific situation and recommend the right solution.

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Looking for experienced contractors? The New Brunswick Construction Network connects homeowners with qualified professionals:

• Arctic Fox Construction Inc.
• Thirty Four Renovations
• 3Tone Construction Ltd
• Gionetterenovations
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