Every fall there’s one week in Kitchener where the weather just quits on you. Tuesday it’s 22 degrees and half the neighbourhood is still cutting grass. By Friday night it’s four degrees, the wind’s picked up, and somebody in the house is asking why it’s so cold in here.
That’s the week our phones go sideways.
And it makes sense. Your furnace has been sitting quietly in the basement since April. Dust has settled on the burners. The filter’s been slowly filling up. A flame sensor has gone dirty without anyone noticing. Then you ask it for heat for the first time in five months and everything it’s been putting off shows up at once.
We run a lot of no-heat calls in October and November. The honest truth is most of them could have been avoided with a service visit in September.
So if you’re in Kitchener, Waterloo, Cambridge, Guelph, or anywhere out in the townships, here’s what’s actually worth doing before the cold sets in.
Why The Timing Matters More Than People Think
Booking a tune-up early isn’t only about the equipment. It’s about getting a spot.
Once we get that first real cold snap, every HVAC company in the region shifts into emergency mode. No-heat calls jump the queue, and they should. If there’s a family with a newborn or an 80-year-old sitting in a house that’s dropping through 12 degrees, that call comes first. But it means the routine maintenance appointment you wanted for a Thursday morning is suddenly three weeks out.
Book in the fall and you pick the day.
There’s a bigger reason too. If our tech opens up your furnace in September and finds an inducer motor that’s on its way out, or a pressure switch reading right at the edge, you’ve got weeks to sort it out. We can order the part. You can get a couple of quotes. You can look at financing without feeling rushed.
Find that same problem at 11 o’clock on a January night and your options shrink to whatever can be installed tomorrow. We’ve all seen how that goes.
What Your Furnace is Probably Trying to Tell You
Furnaces don’t usually die out of nowhere. They give you a heads up. Most people just don’t know what they’re listening for.
It keeps starting and stopping: Fires up, runs a few minutes, shuts down, starts again. That’s called short cycling, and it usually points to a restricted filter, an overheating limit switch, a thermostat issue, or a furnace that’s simply too big for the house. Whatever the cause, it chews through parts and burns more gas than it should.
New noises: A soft whoosh when it kicks on is fine. Scraping metal isn’t. Neither is a squeal that follows the blower, or a rumble that keeps going after the burners shut off. If you get a delayed boom on ignition, that’s usually burners needing a clean, and it’s a safety thing rather than a comfort thing. Don’t sit on that one.
Upstairs is always cold: If your bedrooms run three or four degrees behind the main floor every single winter, the furnace probably isn’t the problem. It’s usually ductwork, return air, or balancing. It’s fixable, but only if somebody actually looks at the duct system instead of throwing parts at it. Older homes around Central Frederick and Victoria Park are notorious for this, especially where a second floor got finished decades after the original heating layout was drawn.
The flame looks wrong: Natural gas should burn a clean blue. Yellow, orange, or lazy flickering means it isn’t burning completely. Call somebody. Don’t poke at it yourself.
Your gas bill crept up and nothing else changed: Efficiency slides slowly as heat exchangers foul and airflow gets restricted. A 15-year-old furnace with 80% on the label might be running well below that in real life.
A CO alarm went off: Get everyone outside first. Then call. There is no version of this where you wait and see.
What a Real Tune-Up Looks Like
“Furnace tune-up” means wildly different things depending on who shows up. Some outfits treat it as a filter change and a handshake.
When our techs do a seasonal service on a gas furnace, they’re cleaning and inspecting the burners and the burner compartment, checking the heat exchanger for cracks and corrosion, cleaning the flame sensor, testing the igniter, checking the inducer motor and pressure switches, verifying gas pressure, taking a CO reading in the flue, inspecting the venting, clearing the condensate drain, checking blower amp draw, and measuring static pressure to confirm the system’s actually moving the air it’s supposed to.
That’s the difference between knowing your furnace is fine and assuming it.
The heat exchanger check is the one that matters most. It’s the metal wall separating combustion gases from the air blowing through your house. When it cracks, combustion byproducts can get into that airstream, carbon monoxide included. Cracks show up more often past the 15-year mark, and it’s one of the few findings where the conversation moves straight from repair to replacement.
The filter thing
A large share of the problems we get called out for come back to airflow, and airflow problems usually come back to the filter.
Check it monthly, not quarterly. The three-month rule on the box assumes an average house. If you’ve got two dogs, a renovation on the go, or a finished basement that never stops making dust, monthly is closer to reality.
And higher MERV is not automatically better. Drop a MERV 13 into a system that wasn’t designed for it and you can restrict airflow enough to trip the high limit and put real strain on the blower motor. If you want better filtration, the answer is usually a proper media cabinet with a four or five inch pleated filter. Way more surface area, way less resistance. Not a denser one-inch filter crammed into the existing slot.
Also, the arrow points toward the furnace. We fix that one more often than you’d guess.
Keeping a clean filter in there does something else people don’t think about. It protects the blower wheel. Once that wheel loads up with dust, your airflow is permanently down until somebody pulls the motor and cleans it. That’s a real job. A filter is fifteen bucks.
Winter here is brutally dry
Waterloo Region winters pull the moisture right out of a house. Outdoor air at minus 15 barely holds any to begin with, and once you heat it up to 21 indoors, relative humidity in a lot of homes drops under 25%.
That’s your static shocks. Your cracked hardwood. The trim splitting on the staircase. Waking up with a sore throat in February. And that feeling where the thermostat says 21 but the house still doesn’t feel warm.
A whole-home humidifier tied into the ductwork handles this properly, and portable units really don’t. It’s not an expensive add-on either, especially if it goes in while a tech is already at the house. Somewhere around 35 to 40% is a good target in mild weather, and back it down to 25 or 30% during a deep freeze so you’re not fighting condensation on the windows.
If your place is newer and tightly built, ask about an HRV while you’re at it. A tight envelope holds heat beautifully. It also holds stale air.
Carbon monoxide, and why we won’t shut up about it
Ontario’s Fire Code requires working CO alarms in homes with fuel-burning appliances, an attached garage, or a fireplace, installed near the sleeping areas. If you heat with gas, that’s you.
Test them when you test your smoke alarms, twice a year. Replace the whole unit at the end of its rated life, usually seven to ten years. The sensor wears out whether the thing still beeps or not, and a chirping test button doesn’t mean the sensor is still reading accurately.
One more, and this catches people every winter. After a big storm, go outside and make sure the intake and exhaust pipes on the side of your house aren’t buried. On a lot of Kitchener homes those vents sit low on a side wall, sometimes right where the plow or the shovel pile ends up. A blocked vent will shut a high-efficiency furnace right down, and in a bad case it can cause exhaust to spill back. Two minutes with a broom.
Repair it, or replace it?
There’s no clean formula, but here’s roughly how we think about it.
If the furnace is under 12 years old, the problem is one component like an igniter or a flame sensor or a capacitor, the heat exchanger is sound, and it’s been looked after, repair it. Easy call.
If it’s past 15, the heat exchanger is compromised, the repair is running a third or more of what a new system costs, or you’ve been calling for service two or three winters running, it’s time to talk about replacing it.
Efficiency is the other side of it. Every new gas furnace sold in Canada is high-efficiency now by law, 95% AFUE and up, with plenty of models hitting 96 to 98. If you’re still on a mid-efficiency unit in the high 70s or low 80s, roughly a fifth of what you’re paying Enbridge is going straight out the flue. Over a full winter here, that’s real money.
Sizing matters just as much, and this is where a lot of installs go wrong. Bigger isn’t better. An oversized furnace short cycles, wears itself out early, and still leaves you with cold rooms. Proper sizing comes from an actual heat loss calculation based on your square footage, insulation, windows, and which way the house faces. Not a rule of thumb, and not “well, the old one was a 100,000 BTU.”
Worth asking whether a straight furnace swap is even the right move. Cold-climate heat pumps have come a long way, and a dual-fuel setup, where the heat pump carries most of the shoulder season and the gas furnace takes over when it gets truly cold, works well in this climate. It’s also where most of the incentive money currently sits.
Who we are
Able Air Conditioning & Heating is family owned and family run, out of 1501 Victoria St N in Kitchener. We’ve been doing this in Kitchener-Waterloo, Cambridge, Guelph and the surrounding townships for over 20 years. Elmira, St. Jacobs, Baden, New Hamburg, Ayr, Breslau, Fergus, Elora, Rockwood, Puslinch, and everywhere in between.
A few things worth knowing:
We run 24/7 emergency service, because furnaces don’t check the time before they quit. We’re TSSA licensed, HRAI members, BBB accredited and Google Guaranteed. We’re an award-winning Amana and Daikin dealer, and we install and service Lennox, Goodman, Coleman, Rinnai, Navien and Bradford White as well. We’re an authorized Enbridge Sustain partner, so if you’re weighing a high-efficiency furnace or a heat pump we’ll walk you through what you actually qualify for rather than handing you a website. And we offer maintenance and protection plans that cover your seasonal tune-ups and put you at the front of the line when the weather turns, plus financing so a replacement doesn’t have to land all at once.
Book it before the rush
If nobody’s looked at your furnace since last winter, this is the window. Get it serviced while the schedule’s still open, find out honestly where your system stands, and go into the cold knowing what you’ve got. Call us at (519) 954-7300 or book online at ableairkw.com. Free estimates on new equipment, emergency service around the clock, and a tech who’ll actually explain what he found instead of handing you a bill.
