A cracked heat exchanger means the furnace should not keep running
The heat exchanger keeps the flame and its exhaust separate from the air your furnace blows through the house. When it cracks, combustion gases, including carbon monoxide, can reach that air. This is the one finding where we will be direct: a furnace with a cracked heat exchanger should be shut off and not used again until it is replaced.
If a technician finds a crack, we show it to you and explain what we saw. If your carbon monoxide alarm sounds, leave the house first and call for help from outside. Ontario requires a working carbon monoxide alarm next to each sleeping area in a home with a fuel-burning appliance, so check that yours are in place and tested. Our guide on carbon monoxide covers the details.
Some signs point to a furnace near the end of its life
Most worn furnaces do not fail all at once. They give small signs over a season or two. Repairs come more often. Some rooms stay cool while others are warm. The furnace runs longer to reach the same temperature, or starts and stops in short bursts. You hear new rattles, rumbles or a loud start-up. Gas bills climb with no change in how you live.
None of these on its own means you need a new furnace. A blocked filter or a failing part can cause the same symptoms. What matters is the age of the unit, the condition of the heat exchanger and how the cost of the next repair compares to replacement. We give you both numbers so you can weigh them. Our guide on how long a furnace lasts goes through the signs in more detail.
Binbrook's three kinds of houses need different replacements
The oldest houses sit in the village core along Highway 56 and Binbrook Road. Many were built for oil or coal and later converted to gas. In houses like these a technician may find a chimney that was never relined, ducts that are too small for a modern blower, and sometimes an old oil tank left in place. Each of these affects how a new furnace is installed.
The mid-century detached houses along Binbrook Road usually have mid-efficiency furnaces vented through a chimney. Many of those units are now near the end of their life, with worn heat exchangers, venting that does not match the furnace, and original ductwork. Moving to a high-efficiency furnace here often means new venting through the side wall and a look at the ducts.
The newer subdivisions and townhouses around Fall Fair Way, Fletcher Road, Royal Winter Blvd, Binhaven Blvd and Reid Ave N mostly have high-efficiency condensing furnaces vented through the side wall with plastic pipe. These houses are built tight, and the original furnace is often larger than the house needs. A replacement is a chance to fix that.
A new furnace is sized to the house, not the old label
Copying the size printed on the old furnace is a common mistake. A furnace that is too big heats the house in short bursts, cycles on and off often, wears faster and leaves rooms uneven. A furnace that is too small runs constantly on the coldest nights.
Before we price a replacement, we look at the house itself: its size, insulation, windows and how air moves through the ductwork. A tight newer home off Fall Fair Way often needs a smaller unit than the one it came with. An older house in the core may need duct or return-air changes before a modern variable-speed furnace will run quietly and evenly. We explain what we found and why we recommend the size we do.
Venting, chimney and condensate are planned before the work starts
A high-efficiency furnace vents through plastic pipe in the side wall. The pipes need to sit where snow drifts and ice will not block them, because a blocked vent makes the furnace shut itself off. We plan where they go and how high, and explain what to keep clear in winter.
When an older furnace leaves the chimney, a gas water heater may be left venting alone into a flue sized for much more. That can stop it from drafting properly. We check the chimney and tell you if it needs a liner. Condensing furnaces also produce water, so the condensate drain is routed to a proper floor drain or pump and protected from freezing.
Work is performed by TSSA-certified gas technicians, and gas appliances are installed to the CSA B149.1 Natural Gas and Propane Installation Code, adopted in Ontario under Ontario Regulation 212/01.
A replacement follows clear steps from first visit to start-up
We start with a visit to see the house, the old furnace, the venting and the ducts. You tell us what has been happening and what matters to you, whether that is quieter running, even heat upstairs or lower bills. You then get a written price, and nothing is fitted until you approve it.
On installation day the old furnace is shut off, disconnected and removed. The new one is set, connected to the gas line, venting, ductwork and condensate drain, and wired to the thermostat. We then start it, check the gas pressure, the combustion and the airflow, and confirm it is heating properly. We show you the filter, the switch and the vents, and leave the paperwork you need to register the manufacturer's warranty.
Manufacturer warranties often ask for regular servicing. A seasonal maintenance visit keeps those terms met and catches small problems early. If you are thinking about cooling at the same time, ask about heat pumps or air conditioning installation.