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

Three kinds of people read this page, and they need different numbers:

• Your unit has died, or you've been told it has. You want to know what a replacement costs, and whether it's really dead. (Often it isn't.)
• You don't have one yet and the house has started fogging its windows every winter. You want to know what a first-time installation costs.
• Your house has no ductwork at all. Baseboard, hot-water radiators, or ductless heat pumps. You want to know if an HRV is even possible.

All three are answered below, with Canadian cost data and the actual building code where it matters.

Every figure here is a planning estimate in Canadian dollars, before 14% HST, not a quote. We've deliberately framed the ranges toward the higher end: we'd rather you budget generously and come in under. The single biggest variable is how much ducting has to be built, not which box goes on the wall.

The short version

Where each range comes from is set out in the Sources section at the end.

First: air exchanger, HRV and ERV are three different machines

Most people in Nova Scotia call whatever is hanging from the basement ceiling "the air exchanger." That's fine in conversation, but it matters when you're pricing a replacement, because Efficiency Nova Scotia separates three distinct systems:

• Air exchanger: swaps stale indoor air for fresh outdoor air. Its drawback, in Efficiency Nova Scotia's words: "Heat is lost through the exchange of air."
• HRV (heat recovery ventilator): does the same swap, but passes heat from the outgoing air to the incoming air through a core. You ventilate without throwing your heating out the wall.
• ERV (energy recovery ventilator): an HRV that moves moisture between the airstreams as well as heat.

Efficiency Nova Scotia also notes that "In Nova Scotia, the majority of new homes have an HRV." So if your house is newer, "the air exchanger" is probably an HRV. If it's an older install with no heat-recovery core, replacing it with an HRV is an upgrade, not a like-for-like swap. It costs more than a straight replacement and it's worth more too.

Not sure which you've got? The model number on the label settles it. So does a photo of the unit with its front panel open.

What HRV installation costs in Halifax and Nova Scotia (2026)

Straight replacement: $2,500 – $4,500

The ducting, which was the expensive part of the original job, is already paid for. You're buying the machine, a day's work, and the balancing that makes the new unit actually perform.

First-time installation: $5,000 – $7,500, and more in big or finished homes

Here dedicated fresh-air and stale-air ducting has to be built. A large, multi-storey or fully finished home can go past $7,500, because the cost is mostly time spent routing duct through spaces that weren't built for it.

What the Canadian data says

HomeStars, the Canadian cost source we use for this trade, breaks it down like this:

Read the table from the bottom up. New ductwork can be up to $6,600, almost three times the most expensive unit. That's the whole story of HRV pricing: the machine is a line item, the ducting is the job.

For planning, we use a labour and installation allowance of $1,200 – $2,000 rather than HomeStars' $250 – $400. That's deliberate. HomeStars' figure is for connecting a unit to ducting that's already right. Most installs we see also need the hoods moved, a condensate drain, a control wired in, flex duct replaced, and the airflows measured and balanced. We'd rather you plan for that than be surprised by it.

Two more reasons published ranges read low here:

• Halifax is not the national average. Statistics Canada's building construction price index had Halifax residential construction costs up 2.1% in Q2 2026, against 0.5% across the 15 cities it tracks. A number published a year or two ago was set before that.
• HomeStars' lowest installed figure is from Toronto. Its $1,500 – $3,250 range covers the Greater Toronto Area and includes basic ducting. It isn't a Halifax floor.

Add 14% HST to every figure on this page. Nova Scotia's rate has been 14% since 1 April 2025, and published cost data, ours included, is quoted before tax.

What moves your number

• How much ducting has to be built. The dominant factor by a distance.
• Tie-in or dedicated ducting (see the next section). Tying in is cheaper; dedicated works better.
• Access. An open basement versus finished ceilings is the same story as with any ductwork cost: you pay for time in awkward spaces.
• HRV or ERV. ERVs generally cost a little more.
• Unit capacity and quality. A bigger house needs a bigger unit, and the cheap end of the market is where the ten-year failures come from.
• What the old install got wrong. Undersized ducts, hoods too close together, fresh air delivered to a hallway. Fixing those is part of doing the job properly.

First-time installs: tie into the furnace ducts, or run dedicated ducting?

Natural Resources Canada's homeowner guide to heat recovery ventilators describes the two standard ways to get fresh air around a house:

1. Tie into a forced-air furnace. The HRV's fresh-air duct connects to the furnace's main return, and the furnace fan spreads the air through the existing supply ducts. It's cheaper to install. NRCan's caveats: the furnace blower has to run continuously at low speed whenever the HRV is on, an older-style (PSC) blower motor doing that can be noisy and use a lot of electricity, and "separate, additional ductwork may be needed" to bring stale air back from the bathrooms and kitchen area.

2. Dedicated (direct-ducted) system. The HRV has its own supply ducts to the bedrooms and living areas and its own exhaust ducts from the damp rooms. It costs more to build and it works better.

Efficiency Nova Scotia is blunt about the first option. Heating ductwork "can sometimes be used for ventilation purposes, but is not an ideal solution": heating ducts are designed to carry much larger volumes of air, which makes it hard to get fresh air evenly through the house, "particularly if the heating system's fan isn't on."

For the dedicated route, the same guide sets out what good ducting looks like. Ducts should be "properly sized and as short as possible, straight and direct, made from sheet metal, and provide fresh air to every bedroom and the main living areas of the home," with the intake and exhaust ducts insulated against condensation.

Made from sheet metal is our trade, and it's the part of the job some HRV installers don't offer at all.

No ductwork at all? Baseboard, hot-water rads and ductless heat pumps

Plenty of Halifax houses have no forced-air ducts at all: electric baseboard, hot-water radiators, or ductless mini-splits added in the last few years. There's no furnace duct to tie into.

An HRV still works. It just needs its own ducts. NRCan says so directly: a direct-ducted system "is often found in homes that do not have forced-air heating, such as those with electric baseboard, hot water or radiant heating."

What the job involves:

• Supply ducts to each bedroom, the living room and the basement. NRCan's sizing guide works room by room: about 10 L/s (20 cfm) for the main bedroom and an unfinished basement, and 5 L/s (10 cfm) for each other room. Its ten-room example needs a unit rated around 60 L/s (120 cfm).
• Exhaust ducts from the bathrooms and kitchen area, where the moisture comes from.
• A route through a finished house: closets, bulkheads, basement ceilings, the occasional chase. This is where the cost lives, and it's why these jobs sit at the upper end of the first-time range.

Can you do it in an older home? Yes, and older Halifax houses that have been air-sealed, re-windowed or converted off oil often need it most. The one honest exception is a draughty, never-renovated house: it's already ventilating itself (inefficiently) through every gap, so an HRV is less urgent there. For what tends to be wrong with the air side in older housing stock generally, see common ductwork problems in older Halifax homes.

Single-room ductless units, told honestly

HomeStars lists single-room units at $400 – $1,500. They mount through an exterior wall and ventilate the room they're in, with no ducting.

When one is enough: a single problem room, like a basement bedroom with fogging windows, a bathroom with no practical exhaust route, or a small condo.

When it isn't: whole-house moisture. If windows fog in several rooms, closets smell musty, or the house was tightened up in a renovation, one wall unit treats a symptom in one room. Several of them start to cost what a small ducted system does, without the distribution.

We'll tell you which you've got. If one wall unit will solve it, that's the answer you'll get from us.

Supplying your own unit

Yes, we install units homeowners have bought themselves. It's a sensible way to control the cost of the machine. It only goes wrong when the unit doesn't suit the house, so check these before you order:

• Capacity. Use the NRCan room-by-room figures above. An oversized unit over-ventilates and dries the house out; an undersized one never keeps up.
• Connections. The duct collar sizes should match what's already there, or budget for transitions.
• Tested performance. Under its energy-efficiency rules, the National Building Code sets a floor for an HRV providing a home's required ventilation: at least 60% sensible heat recovery at 0 °C when tested to CSA C439 (NBC 2020, Article 9.36.3.9). The spec sheet will list it.
• Defrost. A Nova Scotia winter will ice a core without a working defrost cycle.
• Warranty. The unit's warranty is between you and the seller or manufacturer. The installation is ours to answer for.

Before you replace: what's usually actually wrong

Most of the "dead" air exchangers we're called about aren't dead. The usual culprits:

• Filters packed solid. NRCan recommends cleaning them every one to three months. Many haven't been touched in years.
• A fouled core. NRCan says to inspect it twice a year. A dirty one strangles airflow long before it fails.
• A blocked exterior hood. Lint, leaves, snow or a nest shut the system down as effectively as a broken motor.
• An iced-up core after a cold snap, from a failed or misconfigured defrost.
• A seized damper motor. A replaceable part, not a replaceable unit.
• Controls never set up. Installed, switched on, never commissioned.

NRCan also recommends a yearly service by a contractor, and most early failures trace back to that never happening. None of the problems above needs a new machine, and several of them take an afternoon.

How long they actually last

The trade usually quotes 10–15 years, which is the conservative end. InterNACHI's life-expectancy chart, the reference home inspectors use, lists a heat-recovery ventilator at 20 years (a US source; see the note under Sources). If someone tells you a twelve-year-old unit is simply "due," that's a sales position, not an inspection standard.

• Maintained units reach 20.
• Neglected units often don't make 10. The motor or damper goes first.
• Cheap units fail early, at the motor.

Repair or replace: the actual decision

Repair when the unit is under about 12 years and the failure is one part: a damper motor, a control board, a fan.

Replace when the unit is past its lifespan and the motor or core has gone. A major component repair can run well over a thousand dollars, and putting that into a machine with two years left is money spent twice.

The unit's age decides it, not the price of the part. A $1,500 core in a 6-year-old machine is a repair. The same core in a 16-year-old machine is a down payment on a replacement.

HRV or ERV for a Halifax home?

For most homes here: HRV. Nova Scotia's winter problem is a house holding too much moisture, and getting it out is exactly what an HRV does. Efficiency Nova Scotia lists the HRV's one drawback as "limited ability to control moisture in the summer." An ERV transfers humidity as well, which helps in very tight homes that run too dry in winter and costs a little more.

Anyone recommending the switch should be able to say specifically why your house is the exception. ERV vs HRV in Nova Scotia works the decision through in full.

The step that decides whether it works: balancing

An HRV moves two airflows, fresh air in and stale air out, and they have to be measured and set equal. This isn't our opinion. It's in the building code. For an HRV providing a home's required ventilation, the National Building Code requires that "all start-up procedures recommended by the manufacturer, including air balancing and airflow determination, shall be followed" (NBC 2020, 9.32.3.12.(4), in force in Nova Scotia since the province adopted the 2020 codes). Efficiency Nova Scotia says the same in plain English: "A new system should be balanced when it is installed."

What happens when it's skipped, per NRCan:

• More air out than in (negative pressure) can pull carbon monoxide and combustion gases back down a furnace, water heater or fireplace flue, and draws soil gases and moisture in through the basement.
• More air in than out (positive pressure) pushes warm, damp household air into the walls and roof, where it condenses. NRCan's words: "This hidden problem often goes undetected until severe damage has been done." It can also frost the HRV's own core.

Balancing takes instruments and time, and it's the step that gets dropped when an install is priced to win. Ask whether balancing is in the quote. If the answer is vague, that's your answer. It's in ours as a matter of course, as part of how we install and replace HRVs and ERVs.

Where the hoods go (and why Halifax snow matters)

The two holes in your outside wall are governed by code too. Under NBC 2020, 9.32.3.13:

• The fresh-air intake must sit at least 450 mm above the ground, "or the depth of expected snow accumulation, whichever is greater." A Halifax snowbank is the design condition, not an edge case.
• Exhaust outlets carrying moist air, "such as bathroom ventilation and clothes dryer exhaust outlets," must be at least 1,800 mm (about 6 ft) from air intakes and from vented soffits.

Efficiency Nova Scotia gives the same six-foot spacing between the HRV's own intake and exhaust. Hoods jammed together so the unit breathes its own exhaust, or an intake beside the dryer vent, are faults we regularly find on older installs. They're cheap to fix while the replacement is going in, and expensive to leave.

Where the ducting matters as much as the machine

A lot of the HRV failures we're called out to fix are really duct problems:

• Fresh air delivered to a hallway instead of bedrooms and living space.
• Stale air pulled from the wrong end of the house.
• Flex duct crushed, kinked or sagging enough to strangle the airflow.
• Uninsulated duct through a cold space, condensing and dripping.

A new unit on the old ductwork will perform like the old unit. If the original install was rough, the replacement is the time to correct it, and that's ductwork, our actual trade.

An HRV doesn't work alone, either. A bathroom fan dumping into the attic or a range hood that was never vented outside makes moisture faster than any HRV can clear it. (Efficiency Nova Scotia also warns that a range hood should never connect to the HRV itself: "cooking grease could clog the system's core.")

Is an HRV worth the money?

In a tight house, yes. Efficiency Nova Scotia notes that "the national building code requires mechanical ventilation in all new homes." Older homes get to the same place through renovation: new windows, air sealing, insulation, or a conversion off oil. Moisture from showers, cooking, laundry and breathing has to leave somehow. A house that no longer leaks puts it on the windows first and in the walls next.

The running cost is small. HomeStars puts typical draw at 30 – 90 watts running continuously. At a mid-range 60 W, that's about 525 kWh a year. Multiply by your Nova Scotia Power rate for the dollar figure.

On rebates: we searched Efficiency Nova Scotia's programs and found no standalone rebate for an HRV as of this update. Some national cost guides still mention the Canada Greener Homes Grant, but it has closed to new applicants. What's still open, and what it pays for, is in our Nova Scotia heating rebates guide.

Where we fit in

HRV and ERV installation, replacement and ducting is our own trade, not something we hand off. That work is air-side, which is what we do. Refrigerant and heat-pump commissioning go to our licensed RACM partners; the ventilation side is ours.

That also means we've no reason to sell you a machine you don't need. If your unit is ten years old with a plugged filter and a blocked hood, we'd rather tell you that and hear from you when it genuinely dies.

Every figure on this page is an estimate. The unit, the state of your ducting, and how much has to be built set the real number, and the fastest way to find out which job you have is to show us.

Sources

Cost figures on this page are planning estimates in Canadian dollars, before tax, not quotes. There is no official price schedule for this work, so the ranges come from published Canadian market data and are deliberately framed toward the higher end. Last verified September 21, 2026.

On tax: published cost figures conventionally exclude value-added taxes, and ours do too. Nova Scotia's HST is 14%, after the province cut the provincial portion to 9% on 1 April 2025. Add it to any figure above.

Canadian sources

• HomeStars (Canadian, CAD): heat recovery ventilation system cost, read in a browser on 2026-09-21. Unit, labour, ductwork and single-room ranges; the 30–90 W running draw; and the Greater Toronto Area $1,500–$3,250 installed range, which we cite as Toronto data rather than a Halifax floor. Its mention of the Canada Greener Homes Grant is out of date (see our rebates guide).
• National Research Council of Canada: National Building Code of Canada 2020, free from NRC. Cited: 9.32.3.12.(4) (HRV start-up, air balancing and airflow determination), 9.32.3.13.(2) and (4) (intake height above grade or snow; 1,800 mm from moist-air exhausts), and 9.36.3.9.(3) (minimum 60% sensible heat recovery at 0 °C, tested to CAN/CSA-C439).
• Province of Nova Scotia: Province to adopt 2020 National Building Codes, for adoption of the 2020 codes from 1 April 2025 (with some requirements tiered in through 2029).
• Efficiency Nova Scotia: Ventilation for New Homes. The air exchanger / HRV / ERV distinction; "the majority of new homes have an HRV"; sheet-metal dedicated ducting; heating-duct tie-ins "not an ideal solution"; six-foot hood spacing; balancing at installation; keeping range hoods off the HRV.
• Natural Resources Canada: Heat Recovery Ventilators (Office of Energy Efficiency, revised February 2012). Tie-in versus direct-ducted systems, direct ducting in homes without forced air, room-by-room sizing, the effects of imbalance, and maintenance intervals. It is a 2012 publication: we use it for how the systems work and how to maintain them, which hasn't changed, not for prices or program details.
• Statistics Canada: Building construction price indexes, Q2 2026, for Halifax's 2.1% quarterly rise against a 0.5% 15-city composite.
• Canada Revenue Agency: GST/HST rates by province, for the 14% Nova Scotia rate.

What we looked for and couldn't find

• Atlantic-specific installed-cost data. We checked Nova Scotia installers' own pages. Those we could read published either no prices or one-line starting figures without scope, so HomeStars' national data is what the ranges rest on.
• A current Nova Scotia HRV rebate. A search of Efficiency Nova Scotia's site on 2026-09-21 turned up none.

US source, and how far it travels

• InterNACHI (US): the Standard Estimated Life Expectancy Chart for Homes, which lists a heat-recovery ventilator at 20 years. We looked for a Canadian equipment-life figure and found none. What transfers: this is equipment life under normal service, and an HRV in Halifax is the same machine as an HRV anywhere else. What does not: it assumes the unit has been maintained. A neglected filter and core end most units here well short of 20, not the climate.