Comparing Furnace Installation Options in London Ontario High Efficiency vs Standard

Posted on 2026-06-12 20:07:42

Walk into a century home near Wortley Village or a newer two‑storey in Hyde Park, and you will see the same winter reality: London gets long stretches of sub‑zero weather, lake‑effect snow, and a design temperature that can dip below minus 20 C. Heating is not a nice‑to‑have in this city. When you plan furnace installation in London Ontario, you make a call that shows up on your gas bill for 15 to 20 years, and that affects comfort every single day of the heating season.

Contractors frame the choice as high efficiency versus standard, but those labels hide a lot of nuance. Efficiency ratings matter, yet venting routes, duct sizing, control strategies, and even the way your water heater breathes can determine what you should install. The right answer sometimes surprises people. I have pulled out eighty percent furnaces in houses that never should have had them, and I have also advised homeowners to keep a standard unit when their layout or budget made a condensing upgrade unrealistic without major retrofits.

This guide unpacks the trade‑offs I see on real jobs in London and nearby communities, from Komoka to Dorchester.

What high efficiency and standard actually mean

High efficiency gas furnaces, often called condensing furnaces, run at 95 to 98 percent AFUE. AFUE is the seasonal efficiency measure that compares usable heat to the energy in the fuel. Standard furnaces in the current market are typically 80 percent AFUE. The older 60 to 70 percent units are nearly gone outside of teardown jobs.

The efficiency gap comes from how the furnace handles flue gases. A standard furnace exhausts hot gases up a metal chimney or B‑vent, sending a lot of heat outdoors. A high efficiency unit cools those gases enough that water vapour condenses, reclaiming latent heat. That is why high efficiency furnaces use PVC or CPVC venting and have a condensate drain line. The installation details that flow from this one difference drive most of the on‑site decisions.

London housing stock and why it matters

London has a split personality in its housing. There are pre‑war homes with stone basements and narrow mechanical rooms, and there are subdivisions with modern framed basements and long trunk lines. Older homes often have:

Limited clearances around the furnace footprint Short chimney runs not designed for orphaned appliances Leaky ductwork with high static pressure and small returns Short exterior wall runs that complicate two‑pipe venting

In those homes, you need to look closely at where you can run intake and exhaust, whether you can manage condensate without freezing, and how much duct and return work is necessary to let a modern ECM blower do its job without whistling or overheating the heat exchanger.

Newer homes in north and west London tend to be straightforward. You can often sidewall vent a two‑pipe system, route condensate to a floor drain, and adapt the plenum with minimal transition work. That is where high efficiency installation usually shines on both cost and outcome.

Operating costs in real dollars

Energy math makes the efficiency discussion concrete. Here is how I frame it at a kitchen table in Byron or Oakridge.

Assume a 100,000 BTU input furnace, a common size that often gets right‑sized down during replacement. AFUE tells you how much of that goes into the home. An 80 percent unit delivers about 80,000 BTU to the house per hour of operation. A 96 percent unit delivers about 96,000 BTU per hour.

Natural gas in Ontario is billed per cubic metre. The total cost per cubic metre, including commodity, delivery, storage, and carbon charges, floats. Over the past few seasons, all‑in rates have often landed in the range of 30 to 50 cents per cubic metre. One cubic metre of natural gas contains around 36,000 BTU.

With those numbers, a family in London that heats a typical 1,800 to 2,000 square foot detached home might use 2,000 to 3,000 cubic metres over a full year, with the majority from October to April. The jump from 80 to 96 percent AFUE can save roughly 15 to 20 percent of the gas used for space heating. If space heating represents 75 percent of your annual gas use, the net household gas savings typically fall into a range of 10 to 15 percent per year.

Translate that to dollars. If you spend 1,000 to 1,500 dollars annually on natural gas, expect 100 to 225 dollars in yearly savings from the higher efficiency furnace. Homes with higher heat loss, longer runtimes, or poorly insulated envelopes will see larger absolute savings, because the furnace runs more. Well‑sealed, newer homes will save less in dollars, though efficiency still helps.

This is not a sales promise, it is a grounded range. The outliers I see are drafty farmhouses that slash 300 dollars or more per year after upgrading, and tight townhomes that save under 100 dollars because their baseline use is low.

Venting routes and the water heater trap

High efficiency furnaces want two PVC pipes, one for combustion air intake and one for exhaust, through a sidewall or roof. That means you need a clear exterior location with proper clearances above grade and away from windows. The minimum height above grade matters in London. Snow drifts can block vents in a single night on the lee side of a home. I like to keep terminations at least 18 to 24 inches above the average snow line in a given yard, and I orient them away from prevailing winds when possible. Intake pipes should be screened to keep out debris, but not so fine that frost clogs them.

Condensate routing is the second venting detail that bites in winter. If you do not have a floor drain near the furnace, you can run a condensate pump, but the discharge needs a warm route to a proper drain. Running a thin vinyl tube along a cold foundation to a laundry tub invites freezing. I see more no‑heat calls from frozen condensate lines than many homeowners expect. A simple heat trace on a vulnerable section, or rerouting the line inside warm space, prevents that service call.

Standard 80 percent furnaces use existing metal chimneys or B‑vent. That feels simpler, but it creates a trap when your water heater shares that vent. If you remove the furnace from a shared flue, the remaining water heater often cannot safely vent up a now oversized chimney. You may need to install a chimney liner to correct the flue size, or convert the water heater to a power‑vented unit with its own PVC run. That extra work frequently erases the “cheaper install” savings that led a homeowner to choose a standard furnace.

I once priced an 80 percent furnace swap in Old East Village thinking we would save the client a thousand dollars. By the time we added a stainless liner for the orphaned water heater, sealant, and scaffolding to address a deteriorated chimney cap, the job landed within two hundred dollars of a 96 percent furnace with two‑pipe sidewall venting. The client chose high efficiency and has not looked back.

Airflow, ductwork, and why the quiet ones cost more

High efficiency or not, a furnace is an air mover. Comfort, noise, and equipment life depend on static pressure and duct design. Most London basements I walk through have return trunks that are a size too small for the blower a modern furnace carries. Throw in a one‑inch filter pressed into a narrow rack, and you create a bottleneck.

This is where staged and modulating furnaces separate themselves. A basic single‑stage 80 or 95 percent unit runs at full fire every time. That can feel loud and cause temperature swings in a home with undersized ducts. Two‑stage units have a low fire rate, often around 60 to 70 percent, and a high rate for colder snaps. Modulating furnaces adjust in small increments, sometimes 1 percent at a time, to match the heat loss. Pair those with an ECM variable speed blower and you get long, quiet cycles and better air mixing. For families in split‑level homes or houses with big open staircases, the difference in evenness is tangible.

If ductwork is constricted, the best furnace in the catalog will still be loud and stressed. I have turned away sales rather than install a high efficiency, two‑stage furnace on a duct system with 0.9 inches of static pressure at the filter slot. The right answer was to add return air, widen a bottleneck, or use a cabinet filter with more surface area. If a contractor quotes furnace installation in London Ontario without measuring static pressure or glancing at your return sizing, ask them to slow down.

Controls and thermostats that match the equipment

Smart thermostats are not all the same. Pairing a two‑stage or modulating furnace with a basic single‑stage thermostat leaves comfort gains on the table. If you invest in staging, ask for a thermostat that can control it natively or through the manufacturer’s communicating protocol. In my experience, homeowners in north‑facing homes feel a clear improvement when the thermostat allows longer low‑stage runs that maintain a narrow temperature band rather than sharp on‑off swings.

If you are tempted by a hybrid system later, where a heat pump handles milder days and a gas furnace picks up in deep cold, choose a control that can handle dual fuel logic. Even if you do not add the heat pump this year, the wiring and thermostat choice can make that future addition clean and inexpensive.

Reliability, serviceability, and furnace repair realities

High efficiency furnaces have more parts: pressure switches, condensate traps, flame sensors that need a clean surface, and control boards that manage staging or modulation. Standard furnaces have fewer failure points. That part is true. What also matters is the way the unit is installed.

Most no‑heat calls I see in January trace back to details, not to an inherent flaw in high efficiency equipment. The condensate line was undersized or lacked a neutralizer where acidic condensate attacked a concrete floor drain. The intake terminator was placed under a soffit that collects icicles. The furnace was jammed in a corner 2 inches from a wall where the blower motor cannot be removed without disassembling the gas train. The filter rack was a sheet‑metal afterthought that leaks more air than it filters.

If you search for furnace repair London Ontario on a Saturday night, you want a gas tech who can find and correct those details fast. When I install, I think like that future tech. Can they pull the inducer without fighting a joist? Do they have a clean sightline to read the board error codes? Will the homeowner be able to remove the filter easily? Serviceability is not visible in a brochure, yet it is what keeps a unit reliable through its second decade.

Safety and code in the Ontario context

In Ontario, gas technicians are regulated by TSSA. Your installer should have a valid G2 or G1 license for the gas work, and an ECRA/ESA licensed electrician should handle new circuits, disconnects, or condensate pump wiring. A gas permit and inspection are standard on replacements and new runs. If a contractor suggests skipping permits to save time, do not proceed.

A few specific Ontario and London area points:

Carbon monoxide alarms are required near sleeping areas. If you replace a furnace and do not have working CO detectors, add them. Clearances for sidewall vent terminations to windows, gas meters, corners, and grade are not suggestions. A vent that meets code in a backyard might be noncompliant on a tight side yard. Chimney liners for orphaned water heaters are not optional. They protect against flue gas condensation that can damage masonry and leak carbon monoxide.

Good contractors in heating and cooling London Ontario know these details cold, but it is wise to ask.

Upfront costs you can use for planning

Prices move with supply chains and promotions, but in the London market the following installed price bands are common for straightforward jobs, before duct changes or water heater work:

80 percent single‑stage furnace: roughly 3,500 to 5,000 dollars 95 to 96 percent single‑stage furnace: roughly 4,500 to 6,500 dollars 96 to 97 percent two‑stage ECM furnace: roughly 5,500 to 7,500 dollars 97 to 98 percent modulating ECM furnace: roughly 6,500 to 9,000 dollars

Add 500 to 1,500 dollars for tricky venting, condensate pumps with long runs, or chimney liner work. If the plenum or return needs rework, budget another 300 to 1,000 dollars. These ranges come from jobs I have seen across London in the past two heating seasons.

Manufacturer rebates come and go seasonally. Utility rebates in Ontario have been in flux, with many incentives shifting toward heat pumps. Furnace‑only rebates are limited or unavailable at times. Check current programs with your utility or the contractor’s office staff, who monitor changes. Financing options are common through manufacturers and local dealers if you prefer to spread costs over time.

Comfort differences you will actually feel

Homeowners often focus on the AFUE sticker. Comfort lives in the staging, blower, and duct match.

In average London homes, a two‑stage 96 percent furnace paired with a variable speed ECM motor delivers a step change in quiet operation and temperature stability compared to a basic single‑stage unit, even another high efficiency one. Bedrooms feel less stuffy. The upstairs holds within a tighter band when the wind swings west and pushes cold air into one side of the house. In bungalows, long low‑stage cycles can dry floors more gently and filter air better.

A modulating furnace takes that a notch further, but the value depends on your house and willingness to invest. In open‑concept homes with tall ceilings, modulation can smooth out stratification. In small semis, you may not notice the extra stages under daily use, especially if the duct system is not tuned.

Noise matters too. Listen to the return grille near the stairs and to the supply by a favourite chair. If you hear a whoosh like a truck window open on the highway, the static pressure is high. Fixing that with return upgrades or a 4‑ or 5‑inch media filter cabinet can make even a mid‑range furnace sound premium.

When a standard furnace still makes sense

There are cases where an 80 percent furnace remains the pragmatic choice in London:

A shared flue with a natural draft water heater that is properly lined and in good shape, and the sidewalls are blocked for venting A heritage façade where sidewall terminations violate conservation rules or aesthetics, and roof venting is not feasible A rural property with frequent power outages planning to run on a small generator, where a simpler PSC blower is easier to power A home with a short remaining life before a major renovation or addition where the entire HVAC system will be redesigned

Even then, look closely at the total picture. If your existing chimney is unlined or marginal, or if your water heater is nearing replacement age, a high efficiency furnace plus a power‑vented water heater might be the safer and ultimately less expensive route.

The hybrid path and future proofing

Heat pumps have reentered the conversation in Ontario, and not only for new builds. The shoulder seasons in London are perfect for an air‑source heat pump. A dual fuel setup pairs a high efficiency gas furnace with a heat pump, letting the electric system heat the home down to a chosen balance point, then handing off to gas when it is furnace repairs Ontario more economical or when temperatures drop. If you are replacing a furnace now and think you may add a heat pump later, ask your installer to:

Leave space for an indoor coil Size the blower and cabinet for the added static Pull a thermostat cable that supports dual fuel control

That small foresight saves real money on the second project.

A quick comparison snapshot

High efficiency furnaces cut space heating gas use by roughly 15 to 20 percent compared to 80 percent units, often saving 100 to 225 dollars per year for a typical London home. Standard 80 percent units use existing chimneys, but may require a chimney liner if a water heater remains on the flue, which narrows the upfront price gap. Two‑stage or modulating high efficiency models paired with ECM blowers deliver quieter, longer cycles and steadier temperatures, especially in two‑storey homes. Installation details in London matter: snowline clearances, condensate routing in cold basements, and return air sizing can make or break performance. Rebates change. Furnace‑specific incentives are limited at times in Ontario, while heat pump programs are more common. Manufacturers often run seasonal discounts.

What good installation looks like in London basements

If I walk into a job off Fanshawe Park Road and see a clean 96 percent furnace on isolation pads, a sealed 4‑inch media filter cabinet, a condensate neutralizer tied into a floor drain with a visible trap, intake and exhaust pointing away from a prevailing west wind and 24 inches off grade, a new shutoff within reach, a drip leg on the gas line, flex connectors without kinks, and a combustion analysis printout taped to the return, I expect that system to run quietly and efficiently for years.

If instead I find a shiny new cabinet choked behind a lally column, a rattling single‑wall vent next to a cold window, a filter slot hacked into the return with duct tape, and a sidewall termination under an eavestrough that forms icicles, I start the conversation about rework. Equipment brand differences are measured in small percentages. Installation quality swings outcomes by orders of magnitude.

Maintenance and the local service ecosystem

Any furnace needs care. With high efficiency units, clean the flame sensor annually, flush the condensate trap, and inspect the intake for debris. With standard units, check the heat exchanger and vent connector for corrosion, and verify draft. Filters matter for both. In homes with pets or active construction dust, step up to a deeper media filter to reduce velocity and extend filter life.

When you search for furnace repair London Ontario at the first cold snap, the companies that pick up the phone are often the ones that installed with service in mind. Ask your installer about their after‑hours policy, truck stock for your model, and warranty process. Manufacturer warranties vary, but a common pattern is 10 years on parts and 20 years or limited lifetime on heat exchangers, with labour covered by the contractor for 1 to 10 years depending on the plan. Keep the registration paperwork and schedule annual maintenance to keep warranties intact.

Budget, comfort, and the judgment call

If the budget is tight, a well‑installed 95 or 96 percent single‑stage furnace with an ECM motor can deliver most of the efficiency benefit and a meaningful comfort lift over a basic 80 percent unit. If comfort is your priority and the house layout demands finesse, a two‑stage or modulating unit earns its keep. If venting paths and water heater implications push costs up in one direction, do the full math before deciding. In many London homes, once you account for chimney heating and cooling london ontario liner work, an 80 percent swap is not much cheaper than a high efficiency upgrade.

For homeowners planning to stay at least five to seven years, the high efficiency path generally makes financial and experiential sense. For near‑term sellers or homes poised for major alterations, a simpler unit can be the bridge.

A short homeowner checklist before you sign

Ask the contractor to show a load calculation or at least explain the sizing logic, not just replace like‑for‑like. Verify venting routes on a floor plan or with painter’s tape on the wall, including heights above expected snow. Confirm how condensate will be handled and where it drains, and whether a neutralizer is included. Review return air sizing and filter cabinet type to keep static pressure in check. Clarify warranty terms, after‑hours support, and the first maintenance visit.

Working with local pros

There are many capable teams handling heating and cooling London Ontario wide. When you meet them, look for curiosity about your house rather than a race to the lowest price. The right contractor asks about hot and cold rooms, listens for duct noise, checks your water heater flue, and brings up carbon monoxide detectors before you do. They also talk plainly about how a furnace installation intersects with future options like a heat pump, humidifier, or air cleaner, and they do not hide when you ask about furnace repair history on the brands they sell.

Furnace installation is not a commodity. It is a craft practiced in cramped corners, under joists, and in the middle of winter when hands are cold and shortcuts look tempting. Trust the person who will still answer the phone a year from now, who lays out the trade‑offs clearly, and who respects your home. With that team, and with a careful choice between high efficiency and standard that fits your house, London winters become a lot more comfortable.

Hometown Heating and Cooling — Business Info (NAP)

Name: Hometown Heating and Cooling

Website: https://www.hometownhc.ca/
Email: [email protected]
Phone: (519) 425-0555

Service Area: London, Woodstock, and Ingersoll (Southwestern Ontario)

Ingersoll Location

Address: 113 Mutual St N, Ingersoll, ON N5C 1Z8
Map/listing URL: https://www.google.com/maps/place/Hometown+Heating+and+Cooling/@43.042608,-80.8860254,17z/data=!3m1!4b1!4m6!3m5!1s0x882e9bfee0d53bf3:0x9f78b1810f24ad23!8m2!3d43.0426041!4d-80.8834505!16s%2Fg%2F1tdgqgkq

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London Location

Address: 45 Pacific Ct Unit #11, London, ON N5V 3N4
Map/listing URL: https://www.google.com/maps/place/Hometown+Heating+and+Cooling/@43.0088901,-81.1800363,17z/data=!4m6!3m5!1s0x882c1f2183b77adf:0x7511cc8383025dcb!8m2!3d43.0101465!4d-81.1752898!16s%2Fg%2F11fsm535_n

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Hours:
Monday-Friday: 8:00AM-5:00PM
Saturday & Sunday: Closed

Open-location code (Plus Code): 2R6F+3V London, Ontario

Socials (canonical https URLs):
Facebook: https://www.facebook.com/Hometownhandc
Instagram: https://www.instagram.com/hometownhandc/
LinkedIn: https://www.linkedin.com/company/hometownhc/

https://www.hometownhc.ca/

Hometown Heating and Cooling provides residential HVAC services across London, Woodstock, and Ingersoll in Southwestern Ontario.

Services include heating and cooling installation and repair, fireplace services, duct cleaning, ductless mini-splits, and gas line work (service scope varies by job).

The Ingersoll location is listed at 113 Mutual St N, Ingersoll, ON N5C 1Z8.

The London location is listed at 45 Pacific Ct Unit #11, London, ON N5V 3N4.

To contact Hometown Heating and Cooling, call (519) 425-0555 or email [email protected].

For directions, use the listings: https://www.google.com/maps/place/Hometown+Heating+and+Cooling/@43.042608,-80.8860254,17z/data=!3m1!4b1!4m6!3m5!1s0x882e9bfee0d53bf3:0x9f78b1810f24ad23!8m2!3d43.0426041!4d-80.8834505!16s%2Fg%2F1tdgqgkq and https://www.google.com/maps/place/Hometown+Heating+and+Cooling/@43.0088901,-81.1800363,17z/data=!4m6!3m5!1s0x882c1f2183b77adf:0x7511cc8383025dcb!8m2!3d43.0101465!4d-81.1752898!16s%2Fg%2F11fsm535_n

Landmarks Near London, Woodstock, and Ingersoll

1) Victoria Park (London)

2) Fanshawe College (London)

3) Pittock Conservation Area (Woodstock)

4) Woodstock Art Gallery

5) Ingersoll Cheese & Agricultural Museum

6) Harris Park (London)