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Ductwork, Heat Pump & Ventilation Guides

Straight answers to the questions Halifax homeowners actually search — straight from the people doing the ductwork.

Modern Heat for a Century Halifax Home: Keeping the Character, Losing the Oil

A century Halifax home can move off oil to modern heating and cooling without losing its character. The three concealed paths are: a small-duct high-velocity (SDHV) system, whose 2-inch supply tubes route through existing wall cavities and closets and end in small, discreet outlets; compact conventional ducting run through basements, closets, and reused pipe chases; or an air-to-water heat pump that keeps the original radiators (least disruption, but no cooling, and the rads must be verified for lower water temperatures). All three pair with cold-climate heat pumps rated well below minus 25 Celsius. Beyond comfort, the switch is one of the largest carbon cuts a Nova Scotia homeowner can make: the federal Oil to Heat Pump Affordability program reports an average reduction of about 2.8 tonnes of CO2 per year for every home converted, measured across a program in which Nova Scotia had more participating households than any other province.

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Small-Duct High-Velocity HVAC, Explained

A small-duct high-velocity (SDHV) system heats and cools a whole home through insulated flexible supply tubes roughly 2 inches across, small enough to route through existing wall cavities, closets, and joist bays — which is why the technology was developed in the 1970s for older homes that can't take conventional ductwork. Air is delivered at high velocity through small, discreet outlets, mixing each room evenly and dehumidifying better than standard systems. Paired with a cold-climate inverter heat pump, an SDHV system heats reliably in Nova Scotia winters. The three established manufacturers are Unico, SpacePak, and Canadian-built Hi-Velocity. Done right — a proper heat-loss calculation, a generous outlet count, and sound-attenuating tubing at every outlet — it runs quietly; those design steps are what separate a good install from a noisy one.

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ERV vs HRV in Nova Scotia: Which Do You Need?

An HRV (heat recovery ventilator) and an ERV (energy recovery ventilator) both continuously swap stale indoor air for fresh outdoor air while recovering most of the heat. The one difference is moisture: an HRV transfers heat only, while an ERV also transfers some humidity. Which is right depends on how your home handles moisture, not on a rule of thumb. Choose an HRV if your house battles winter condensation and dampness — it carries that moisture out. Choose an ERV if your home is tight and gets too dry in winter, or if damp coastal summers are a concern — it holds onto some indoor humidity and blocks some of the summer humidity coming in. The old cold-climate default was HRV, but tight, well-sealed modern homes increasingly favour ERVs, because winter air is so dry that an HRV can over-dry them. Either way, pick a unit rated for our winters — correct ducting and balancing matter more than the HRV-versus-ERV label.

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Air Exchanger (HRV) Replacement in Halifax: Cost, Lifespan, and Whether You Actually Need One

An air exchanger and an HRV are the same thing — "air exchanger" is simply what most Nova Scotians call a heat recovery ventilator. As a planning estimate only, replacing one where the existing ducting is sound commonly runs about $2,500–$4,500 installed in Canada, while a first-time installation that needs new dedicated ducting more realistically lands in the $5,000–$7,500 range and can exceed it in a large or complex home. HRVs are commonly quoted at a 10–15 year lifespan, and a well-maintained unit can reach 20. But before replacing anything, check the cheap causes: a large share of air exchangers written off as dead turn out to be a clogged filter, a fouled core, an iced-up intake, a seized damper motor, or a unit that was never balanced after installation — service work, typically a fraction of replacement cost. These are estimates, not quotes; the unit, the state of the ducting, and how much has to be rebuilt determine the real number.

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How Much Does Ductwork Cost — and How Long Does It Last?

As a planning estimate only, a full ductwork replacement in a typical 1,500 sq ft Canadian home commonly starts around $4,500–$7,500 for straightforward access, but budget $8,000–$12,000 or more once finished walls, multiple storeys, added returns, or custom transitions are involved — which is most real homes. Material runs roughly $15–$25 per linear foot for insulated flex and $30–$45 for galvanized sheet metal, and materials are commonly 40–50% of the bill. Lifespan is a material question, and the gap is large: InterNACHI's inspection standard puts ducting at 60 to 100 years, while flexible duct is more typically 10–15. Most homes don't need full replacement — targeted rework plus sealing is far more common and much cheaper. These are estimates, not quotes: the scope of your specific project determines the cost, and only seeing the system produces a real number.

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Leaky Ducts & Duct Sealing: Is It Worth It?

Most duct systems leak — the U.S. Department of Energy estimates 20–30% of the air moving through them escapes through loose joints, gaps, and disconnected runs, much of it wasted into unheated basements and attics. Sealing pays off most when the ducts run through those unconditioned spaces. Accessible joints are sealed by hand with mastic or UL-181 foil tape (never cloth duct tape); hidden leaks inside a closed system can be sealed with Aeroseal, an aerosolized sealant. Sealing won't fix undersized ducts, too few returns, or crushed runs — those need physical repair, not sealant.

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Bathroom Fan Installation & Cost in Halifax

The cost of a bathroom fan install depends mostly on whether it's a simple swap or a job from scratch. In Canada (2026), a straightforward replacement that reuses sound wiring and ducting typically runs about $250–$400; a replacement that needs new venting is roughly $400–$600; and a from-scratch install with new wiring, a new duct run, and an exterior cap is around $500–$800 or more, with roof terminations at the top end. The fan you choose, the length and condition of the duct, and whether it exits through a wall or the roof are what move the price — so the real number comes from looking at the specific bathroom.

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Dryer Venting Done Right: Length Limits, Safety, and Common Mistakes

A dryer vent should run on the shortest practical path in smooth, rigid metal duct to a proper exterior cap with a backdraft damper. Codes typically limit the total run to around 35 feet, reduced by roughly 2.5–5 feet for every bend (follow your dryer's manufacturer specs and local code). Long or twisty runs and ribbed flex duct choke airflow, lengthen drying times, and build up lint — the leading cause of dryer fires. Never vent a dryer into the house or attic.

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Heat Pump Rebates in Nova Scotia: What's Left in 2026

The Oil to Heat Pump Affordability Program (OHPA) is closed to new applicants in Nova Scotia — its funding was fully allocated and Efficiency Nova Scotia stopped taking applications on July 2, 2026. (The federal program page lists a July 31, 2026 deadline, but Nova Scotia homeowners apply through Efficiency Nova Scotia, so that date no longer helps here.) The federal Canada Greener Homes grant and loan are also closed to new applicants. What remains is the Home Energy Assessment path and the income-tested Moderate Income Rebate, which can be combined. Amounts and availability change often, so confirm current details with Efficiency Nova Scotia before you plan around them.

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What HVAC Contractors Need from a Reliable Ductwork Sub

HVAC contractors need a ductwork sub who shows up on schedule, fabricates to fit instead of forcing stock parts, stays clearly in the air-side lane, and delivers work that doesn't generate callbacks. Reliability, fabrication capability, clean scope, and respect for the contractor's customer relationship matter as much as the sheet-metal work itself — because a sub reflects on the company that hired them.

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How to Choose a Sheet Metal Contractor in Halifax

To choose a sheet metal contractor in Halifax, look for someone who specializes in the air side — ductwork, ventilation, and fabrication — not just equipment sales. Ask whether they fabricate custom fittings, how they handle return air and duct sizing, and how they deal with refrigerant work (which is a separate licensed trade in Nova Scotia). A clear written scope, references, insurance, and honesty about what they don't do matter more than the lowest price.

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Bathroom Fan Venting: Why It Shouldn't End in the Attic

A bathroom fan should always vent outside — through the roof or an exterior wall — never into the attic or a soffit. Dumping warm, humid bathroom air into a cold attic causes condensation on the framing and insulation, leading to staining, rot, and mould. Proper bath venting uses an insulated, sloped duct on a short run to a weatherproof exterior cap, sized to the fan.

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Range Hood Venting Mistakes That Cause Moisture Problems

The most common range-hood venting mistakes are running a recirculating hood that never vents outside, terminating the duct in the attic or soffit instead of through an exterior wall or roof, using long or kinked flexible duct that chokes airflow, and skipping makeup air on powerful hoods. Each one leaves cooking grease, steam, and moisture in the home, where it causes condensation, odours, and mould over time.

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Oil Furnace to Heat Pump Conversion: What Happens to the Ductwork?

In an oil-furnace-to-heat-pump conversion, the existing ductwork usually stays in place, but it rarely comes along untouched. The old furnace is removed and a heat-pump air handler takes its spot, connected to the duct through a new plenum and coil transition. The ducts almost always need assessing, sealing, and often added return air and resizing, because a heat pump moves air differently than the oil furnace did.

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Ductwork Sizing for Ducted Heat Pumps

Ductwork sizing determines whether a ducted heat pump can move the air it's rated for. A heat pump needs a specific airflow (roughly 350–400 CFM per ton of capacity), and undersized supply or return ducts raise static pressure, cutting airflow below what the equipment needs. That robs heating and cooling capacity, increases noise, and shortens equipment life — which is why proper sizing matters more for a heat pump than it did for the old furnace.

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Common Ductwork Problems in Older Halifax Homes

The most common ductwork problems in older Halifax homes are leaky and disconnected joints, undersized or too-few cold-air returns, returns built out of open joist cavities instead of sealed metal, and crushed or kinked flexible duct. Each one wastes heat and starves rooms of air. Most are visible from the basement and fixable without replacing the whole system.

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Why Some Rooms Stay Cold After a Heat Pump Install

When one room stays cold after a heat pump install, the equipment is usually working fine — the ductwork feeding that room can't deliver enough warm air. Undersized branch ducts, too little return air, leaks in the basement or attic, and a system that was never balanced all starve the rooms farthest from the unit. The fix is almost always airflow, not the heat pump.

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Do You Need New Ductwork for a Heat Pump in Nova Scotia?

Not always — but your existing ductwork has to be checked first. A ducted heat pump moves more air, more continuously, and at a lower temperature than an oil or electric furnace, so ducts that worked for the furnace are often undersized, leaky, or short on return air. Most homes need targeted modifications, not a full replacement — an assessment tells you which.

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Ducted vs Ductless Heat Pumps for Halifax Homes

Choose a ducted heat pump for even, whole-home comfort when you already have — or can fit — good ductwork. Choose ductless mini-splits when you want to heat and cool specific rooms without running ducts, or your home has no ductwork at all. Many Halifax homes end up with a hybrid: ducted for the main living space, a mini-split for a stubborn room, addition, or basement.

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What Is an HRV and Why Do Halifax Homes Need Ventilation?

An HRV (heat recovery ventilator) continuously exhausts stale, humid indoor air and brings in fresh outdoor air, transferring most of the outgoing heat into the incoming air through a core. Halifax homes need it because tight modern construction — and many damp older homes — trap moisture and stale air, causing window condensation, mould, and poor air quality. An HRV fixes the cause instead of masking it.

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