Furnace Installation London Ontario Choosing the Right Size and Model
Winter in London, Ontario can swing from damp chills to deep freezes in a matter of days. A furnace that is just adequate on a mild January afternoon can fall behind when the wind howls off Lake Huron and temperatures dip to minus twenties. The right furnace, sized and set up properly, keeps the house evenly warm, quiet, and efficient. The wrong size or model leads to drafts, short cycling, high gas bills, and more calls for furnace repair than anyone wants during a cold snap. This guide draws on what actually works in our region, from older North London bungalows to new two-storey builds in the southwest.
Why size matters more than brand
When homeowners ask about furnace installation in London, Ontario, they often start with brand. Brands matter for support and parts, but sizing and setup move the needle far more on comfort and cost. I have replaced plenty of high-end units that were either oversized or never commissioned properly. They were loud, cycled constantly, and cost more to run than a basic, correctly sized model.
A furnace has to match the heat loss of the home at our design temperature. London’s heating design point sits around minus 18 Celsius, with bursts colder. A furnace that is too small will struggle on those days. Far more common here is oversizing. An oversized furnace hits the thermostat setpoint in short bursts, then shuts off. Rooms feel warm and then cool, humidity drops, and ducts thump from expansion and contraction. The fan may also be too strong for the ductwork, so air whistles and doors rattle.
A proper load calculation uses window sizes and types, wall and attic insulation levels, foundation details, air leakage, and orientation. The tool of choice is Manual J or an equivalent calculation software. Rough rules like BTU per square foot are tempting but unreliable. A renovated 1960s bungalow with spray foam rim joists and new windows can heat well with 25 to 35 BTU per square foot at peak. A drafty, original version of that same bungalow might need 50 to 60 BTU per square foot. I have seen two similarly sized homes on the same street with furnace needs that differed by almost half because one had a tight envelope and the other had original single panes and a leaky attic hatch.
A London snapshot: typical house, typical load
Let’s ground this with a real example. A 2,000 square foot two-storey in the Stoney Creek area, built around 2005, with R-50 attic insulation added during a renovation and vinyl double-pane windows. Brick veneer on the front, vinyl siding elsewhere. Basement is partially finished with a framed, insulated perimeter. Air leakage measured by blower door at about 4.5 ACH50 after some air sealing.
Under those conditions, a Manual J typically shows a heat loss around 45,000 to 55,000 BTU per hour at minus 18 Celsius. A 60,000 BTU nominal furnace with a two-stage or modulating burner usually covers it with headroom for colder snaps. Ten or fifteen years ago many of these homes got 80,000 or even 100,000 BTU single-stage units because that was the default on the truck. On mild days those furnaces run in short bursts and the main floor overheats while the upstairs lags. Swap in a correctly sized, staged unit with a proper blower setup, and comfort levels change immediately.
Efficiency and what it actually buys you
Furnace efficiency is expressed as AFUE, the annual fuel utilization efficiency. Modern condensing gas furnaces in Canada sit between 95 and 99 percent AFUE. A 96 percent model wastes about 4 percent of the heat up the vent, while an older 80 percent furnace sends 20 percent up the chimney. In a London home with a typical winter gas spend of 800 to 1,500 dollars, the jump from 80 to 96 percent can save a few hundred dollars per year, often more if the old unit short cycled or was out of tune.
Choose the efficiency tier with an eye on total system design. Ultra high AFUE models make the most sense when the venting, condensate drain, and blower setup are done right, and the ductwork does not choke airflow. If your ducts are undersized, you will not harvest the comfort that a premium furnace can offer, and static pressure will drive up fan energy.
Burner stages and modulation, and where each fits
The burner design affects how the furnace responds to London’s rollercoaster winters. We often have days hovering around freezing, then nights that dive to minus double digits, followed by sunny, windy afternoons. That swing is exactly where multiple stages shine. Here is a concise comparison to help with selection.
Single-stage: Full output every time it fires. Cheapest upfront, simplest to service. Tends to short cycle in shoulder seasons, can be louder, and may cause temperature swings between floors. Two-stage: Low and high fire. Runs on low most of the time for quieter, longer cycles, flips to high on colder days. A strong choice for most detached homes in London at a good value. Modulating: Many small steps or a continuously variable burner. Keeps temperature very even, pairs well with tight, efficient homes and with zoning. Costs more and needs careful commissioning to deliver its promise.
Anecdotally, I see two-stage 96 percent models hit the sweet spot for many family homes here. Modulating units are excellent in new or renovated envelopes with good duct design, especially when pairing with a heat pump for shoulder seasons.
Blower motors, static pressure, and duct realities
Blower motors come in two broad camps. PSC motors are basic and run at fixed speeds. ECM motors are electrically commutated and adjust to maintain airflow despite changing resistance. In older London homes with marginal ductwork, ECM can maintain airflow better and run quieter, because it can slow down on long runs and ramp as needed. That said, no motor can overcome fundamentally bad ducts. High static pressure, which is resistance in the duct system, makes any furnace loud and inefficient.
Before furnace installation, ask your contractor to measure static pressure across the air handler and to check return and supply sizes. Typical target is total external static at or below 0.5 inches of water column for most furnaces. I routinely see 0.8 to 1.0 in. W.c. On older systems with a 16 by 25 return and a maze of undersized takeoffs. A simple fix like adding a second return grille or upsizing the filter cabinet can drop static dramatically. The difference in sound and airflow is immediate. ECM motors shine after that correction, not as a bandage for poor ducts.
Heating and cooling, one system
Most London homes rely on the same air handler for heating and cooling. A properly chosen furnace must play well with the air conditioner or a heat pump. The evaporator coil above the furnace adds resistance to airflow, so coil selection impacts static pressure. If you are considering a future upgrade to a high-efficiency heat pump, choose a furnace with an ECM blower and enough cabinet height to accept a larger coil. Keep blower speed settings aligned with the cooling tonnage to maintain correct temperature split in summer. I frequently meet systems that cool poorly not because of weak AC units but because the blower is locked at a low speed that was set for quiet winter operation without revisiting summer airflow.
If you are exploring a hybrid system, pairing a cold-climate heat pump with a gas furnace gives flexibility. On mild days, the heat pump handles heating efficiently. When temperatures plunge, the gas furnace takes over. This approach has become popular in heating and cooling London, Ontario because it balances operating cost, comfort, and resilience during deep cold snaps.
Fuel type and venting that survives winter
Natural gas is available across most of London and is the default for new furnace installation. Rural properties and some edges of Middlesex County run propane. The venting requirements differ slightly between manufacturers, but condensing furnaces typically use two PVC or CPVC pipes, one for intake, one for exhaust. Terminations must be set back from windows and doors and above expected snow levels. I have seen exhausts buried after lake effect snow, which trips safety switches and shuts the furnace down right when you need it. Clearances and heights matter in our climate.
Condensing furnaces produce water as a by-product. That condensate must drain to a floor drain or a condensate pump. The line needs a consistent slope and freeze protection if any part of it runs near an exterior wall. A frozen condensate line will lock out the furnace. Good installers insulate runs near cold spaces and use heated pumps where needed.

If you are replacing an old 80 percent furnace that vented into a masonry chimney, talk through what happens to the remaining water heater. You may need a metal chimney liner or to convert the water heater to power vent. Do not leave a water heater orphaned on an oversized, cold masonry flue. That is a recipe for condensation damage and backdrafting.
Indoor air quality decisions that stick
Tight houses in our region benefit from deliberate ventilation and sensible filtration. Furnace filters control dust on coils and ducts more than they protect your lungs, but they still matter. MERV 8 is a practical minimum. For households with allergies, MERV 11 to 13 can help, provided the filter area is large enough to avoid suffocating airflow. If you move to a higher MERV, increase the filter size or go to a media cabinet. I like to keep face velocity under 300 feet per minute through the filter to keep pressure drop low and fan noise down.
Many London homes also use HRVs or ERVs to exchange stale indoor air with fresh outdoor air without losing too much heat. If you are already opening up the ductwork for a furnace installation, that is a good time to integrate or correct ventilation connections so the HRV does not rob the furnace of return air.
Humidifiers are common here. Aim for a controlled humidity level that avoids window condensation. On very cold days, 30 percent relative humidity may be the ceiling for older windows. Over-humidification breeds mold and rots sills. Good installers wire humidifiers to operate only with the furnace fan and through a proper humidistat or integrated thermostat control.
Repair or replace, and the cost calculus
There is no virtue in replacing a furnace that only needs a pressure switch or flame sensor, especially when parts are readily available. I suggest a repair when the part is modest and the heat exchanger is sound. Typical furnace repair calls in London, Ontario run from about 150 to 400 dollars for cleaning and minor parts, 400 to 900 dollars for components like inducer motors or control boards, and more if multiple issues stack up. When the repair approaches half the cost of a new unit or the furnace is past 15 years with a cracked heat exchanger or repeated lockouts, replacement makes more sense.
One winter, I met a family in Byron with a 20-year-old single-stage unit that had failed twice in two months. Instead of another short-term furnace repair, we installed a two-stage 60,000 BTU unit with an ECM blower and added a second return in the finished basement. Their first comment after the install was not about the thermostat reading. It was about how the bedrooms finally felt the same as the main floor, and the fan noise by the family room TV dropped by half.
As for replacement cost, a quality 96 percent two-stage furnace with ECM blower typically lands in the 4,500 to 7,000 dollar range in our market, installed, depending on duct modifications, venting complexity, and whether a new thermostat or humidifier is part of the job. Modulating units and integrated zoning systems can push higher. Be skeptical of numbers far below the norm. Rock-bottom bids often skip commissioning steps or duct corrections that make the difference in comfort and lifespan.
Selecting the right model for your home’s profile
Think in terms of your home’s envelope, lifestyle, and noise tolerance. A drafty older home awaiting window upgrades may not exploit the finesse of a modulating unit yet. A solid two-stage model buys comfort now and will still pair nicely with future improvements. If you work from home and value quiet, place a premium on an ECM blower and low-return air velocity. If you plan to add a heat pump within a couple of years, choose a furnace with a communicating thermostat option and ensure the coil and plenum allow for the larger coil that high-efficiency heat pumps prefer.
SEER and HSPF numbers matter for cooling and heat pump performance. If the budget allows, choose the blower and controls that keep options open. I often stage projects. Year one, replace the furnace and correct duct restrictions. Year two, add a heat pump and upgrade the thermostat. That path spreads cost and avoids painting yourself into a corner with an undersized coil or control board.
Installation day, what to expect
A straightforward furnace swap in London usually takes 6 to 10 hours for a two-person crew. Add time for duct changes, vent relocation, or electrical upgrades. The best installs look a little slower because the team is measuring, adjusting, and documenting. Cutting corners shows up later as callbacks and noise complaints.
Here is a tight checklist to align your expectations with a professional install.
Confirm load calculation numbers and chosen size before the old unit is removed. Measure and record static pressure, gas pressure, and temperature rise during commissioning. Program blower speeds for both heating and cooling, and set staging thresholds in the control board or thermostat. Verify vent clearances, slope, and condensate drainage with a water test, not just a visual check. Provide you with model and serial numbers, warranty registration, and a service log for baseline readings.
If your installer walks you through those items and leaves you with baseline numbers, you are starting from a strong place.
The math, without the headache
A simplified load snapshot helps illustrate why square footage rules are weak. Heat loss is driven by three main factors, each multiplied by the temperature difference to outdoors. Walls, windows, and roof lose heat by conduction. Air leakage carries heat out by infiltration. Basements lose heat to the ground and through rim joists. Improve any of those, and your required furnace output drops.
Take that Extra resources 2,000 square foot two-storey with decent insulation and windows. At minus 18 Celsius outdoors and 21 indoors, the temperature difference is 39 degrees. Window upgrades that cut U-value from 0.5 to 0.3 can reduce window heat loss by 40 percent. Air sealing that drops leakage from 6 to 4 ACH50 often trims total load by 10 to 15 percent. That is why one neighbor’s comfortable 60,000 BTU furnace is another neighbor’s undersized headache. A site visit with measurements beats guesswork every time.
Noise, placement, and finished basements
Most London furnaces live in basements. In finished spaces, clearances and sound matter. If the furnace closet is tight, a louvered door or dedicated return can prevent the blower from sucking air through every gap and whistling. Flexible connectors on supply and return can dampen vibration. A larger filter cabinet reduces air velocity and fan noise. If the unit sits under a bedroom, consider insulating the supply trunk and adding external lined ductboard for the first few feet. These small choices shift the sound signature from rush and rattle to a low, acceptable hum.
Codes, permits, and safety in Ontario
Gas work in Ontario must be performed by a TSSA-registered contractor, and technicians need valid gas fitter certification. Electrical connections and new circuits fall under the Electrical Safety Authority. Like-for-like furnace replacement often does not require a municipal building permit, but vent relocations, gas line extensions, and chimney liner installations must meet code and manufacturer instructions. Expect your contractor to perform a combustion analysis, set gas manifold pressure to specification, and test for carbon monoxide at the appliance and nearby rooms. A red-tagged furnace is not negotiable. Resolve the safety issue before anything else.
Rebates, financing, and timing
Rebate programs change frequently. Some utilities and manufacturers offer seasonal incentives for high-efficiency furnaces or combined systems with heat pumps. Financing plans can help spread the cost, but read the fine print. I advise homeowners to prioritize the right size and proper duct corrections over chasing an extra percentage point of AFUE. A well-sized 96 percent furnace that runs long and steady will often beat a 98 percent unit that short cycles through a noisy duct system. Ask your contractor to price the small duct fixes alongside the furnace so you can see the full picture.
Choosing a contractor in London who will get it right
Experience shows quickly in the questions a contractor asks. If the site visit focuses only on price and brand without measuring returns, supply trunks, or discussing your comfort complaints, keep looking. In the heating and cooling London, Ontario market, you should expect a written proposal that lists the furnace model, AFUE, burner type, blower motor type, filter size, coil model if applicable, venting plan, and commissioning steps. Ask for proof of TSSA registration, WSIB coverage, and manufacturer-trained status if they are proposing advanced controls. Good companies keep records of your static pressure, temperature rise, and gas pressure at install and at annual checks. That history heads off problems before they become service calls on the coldest night of the year.
After the install, habits that keep comfort steady
Filters are cheap insurance. In most homes running standard media filters, change every 2 to 3 months during the heating season, more often with pets or drywall dust from renovations. If you have a 4 or 5 inch media cabinet, you can stretch intervals, but still inspect monthly at first to learn your home’s pattern. Keep the condensate trap clean each fall. If you have a pump, test it with a cup of water.
Schedule a professional check once a year. A meaningful visit is more than a quick vacuum. It includes checking flame signal, inducer and blower amps, gas manifold pressure, temperature rise across the heat exchanger, static pressure, and a combustion analysis with printed readings. If your furnace has staging or modulation, confirm the control settings still fit the home, especially if you add or seal ducts, replace windows, or change the thermostat.
Watch your thermostat habits. Big setbacks can make a high-efficiency furnace short cycle as it attempts to catch up, especially when combined with undersized ducts. A modest overnight setback of 1 to 2 degrees often gives you the best balance of comfort and savings in our climate. If you have a communicating thermostat with adaptive recovery, let it learn. Constant tinkering keeps the system from settling into its most efficient pattern.
A practical path to the right furnace for your London home
Start with a load calculation and a duct assessment. Size to the calculation, not to old habits. Choose staging that fits your home’s envelope and your expectations for sound and temperature evenness. Pair the furnace with a blower and coil that leave room for future cooling or a heat pump. Insist on commissioning with numbers, not just a handshake. Budget for small duct fixes, not just shiny equipment. When furnace installation in London, Ontario happens this way, comfort becomes quiet, steady, and predictable, even when the weather is not.
And if you are stuck in the middle of winter, the heat is off, and replacement cannot happen the same day, a capable technician can often stabilize an older unit. Quick, targeted furnace repair in London, Ontario bridges the gap, buys time for a considered decision, and may reveal whether the old furnace still has life or if it is sending clear signals that it is time to move on.
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/
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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
Popular Questions About Hometown Heating and Cooling
What areas does Hometown Heating and Cooling serve?
Hometown Heating and Cooling serves Southwestern Ontario, including London, Woodstock, and Ingersoll.
What services does Hometown Heating and Cooling provide?
Services listed include heating and air conditioning work, fireplaces, duct cleaning, ductless mini-splits, and gas line services (availability varies).
Where are Hometown Heating and Cooling locations?
Ingersoll: 113 Mutual St N, Ingersoll, ON N5C 1Z8.
London: 45 Pacific Ct Unit #11, London, ON N5V 3N4.
Do they offer emergency service?
The website indicates 24/7 emergency service for urgent HVAC situations.
How can I contact Hometown Heating and Cooling?
Phone: +1-519-425-0555
Email: [email protected]
Website: https://www.hometownhc.ca/
Facebook: https://www.facebook.com/Hometownhandc
Instagram: https://www.instagram.com/hometownhandc/
LinkedIn: https://www.linkedin.com/company/hometownhc/