How long does a gas furnace typically last in BC?

A gas furnace in Metro Vancouver typically lasts 15 to 25 years, with most units hitting the 18 to 20 year mark before repairs start outpacing the value of keeping them running. The mild, damp climate here is a mixed blessing: winters are rarely brutal enough to run a furnace hard for months on end, but the constant cycling on and off in our shoulder seasons and the humidity can wear heat exchangers and inducer motors faster than in drier climates.

What actually determines how long yours lasts

Annual servicing is the single biggest factor. A furnace that gets a tune-up every fall, with a fresh filter and a combustion check, will reliably outlast one that runs ignored until something breaks. Technical Safety BC recommends annual servicing of all home heating appliances, and in Metro Vancouver's wet winters a clogged condensate drain or a dirty flame sensor is often what turns a routine service call into an emergency on the first cold night of October.

Filter changes matter more than most people expect. A high-efficiency furnace with a clogged filter strains the blower motor and heat exchanger, two of the most expensive components to replace. Check the filter every one to three months during heating season, depending on the filter type and whether you have pets.

The other variable is the original installation. A furnace sized from a proper heat loss calculation, vented correctly and matched to the home's ductwork will run longer and more efficiently than one that was oversized and slapped in quickly. Older Vancouver and Burnaby houses with shared chimneys are a particular concern: a high-efficiency condensing furnace cannot vent up a masonry chimney, so the venting has to be reworked at installation, and if it was not done right the unit degrades faster.

Beyond about 15 years, watch the repair bills closely. A heat exchanger crack is a safety issue, not just a cost issue, because it can allow combustion gases including carbon monoxide to enter the living space. If a technician flags a cracked heat exchanger, that furnace needs to come out. City of Vancouver homes are required to have CO alarms within 5 metres of each bedroom door, and that requirement exists for exactly this reason.

The 15-to-25-year window is also when the economics of replacement start to shift. A new high-efficiency condensing furnace (95 AFUE or better) costs roughly $5,500 to $11,000 installed in Metro Vancouver, including the permit. If your furnace is past 18 years and you are looking at a repair over $1,000, most contractors will tell you honestly that replacement is the smarter spend, especially since a new unit will be more efficient and come with a parts and labour warranty.

One more local wrinkle: if you are in the City of Vancouver and considering adding cooling at the same time, any new permanently installed air conditioning in a detached house or duplex must be a heat pump, not a cooling-only unit. That changes the replacement conversation considerably for some homeowners.

A furnace that has served you well for two decades has done its job; the question is just whether to repair or replace, and a good contractor will give you an honest answer on that. When the time comes, line up a few local quotes before the old furnace forces the decision; Vancouver HVAC Pro handles the introductions.