Tempstar Furnace installation in Greater Vancouver

The furnace in a 1978 Burnaby split-level was sized by whoever installed it, using a rule of thumb and the biggest cabinet that fit the closet. Since then the house got new windows, attic insulation and a finished basement. Replacing that furnace with the same number on the nameplate is how you end up with a unit that short-cycles all winter and still leaves the bedroom over the garage cold.

A Tempstar install is mostly decisions made before anyone picks up a wrench. How much heat the house actually loses on a cold, wet January night. Whether the vent can run where the old one ran. Whether the gas meter and the piping can carry the new load with the water heater and range firing at the same time. Where the condensate goes in a crawlspace that sits near freezing.

What follows is the sequence a technician walks, in the order it gets walked, with the Lower Mainland details that actually change the answer: older housing stock, tight side yards, strata rules, damp crawlspaces and municipal permitting. Read it before you sign anything, and you will ask better questions of whoever quotes the job.

What a complete Tempstar changeout actually includes

Ask three contractors to quote a furnace and you can get three different jobs wearing the same equipment name. One is a straight swap: old unit out, new one in, reuse everything. Another includes new venting, a rebuilt plenum, a condensate pump and a permit. The equipment line is nearly identical. The scope is not.

A complete install has roughly nine parts. A load calculation. Equipment selection matched to that load and to the physical space. New vent and combustion-air piping sized for the unit and the run. Condensate collection, trapping, neutralizing and drainage. Gas piping verified or resized to the appliance load. A dedicated, correctly protected electrical circuit and proper bonding. Sheet-metal transitions to your existing supply and return. Thermostat and controls wiring, including any staging or communicating wires the model needs. Then permit, inspection, commissioning and documentation.

Missing pieces show up later as symptoms, not as line items. A reused vent that is too large for a smaller-input replacement condenses in the wrong place. A return that was undersized for the old blower gets worse behind a new one. A condensate line that drains into a dry-trapped floor drain lets sewer gas back into the mechanical room.

When HeatLand quotes a furnace, the written estimate names each of those items, so you can compare it against anything else you have been handed. If a competing quote is silent on venting, condensate or permits, that silence is the difference. Call (604) 330-3812 and we will walk your existing setup with you.

Heat-loss calculation: why the old furnace’s rating is the wrong starting point

Nearly every furnace replaced in the Lower Mainland today is smaller than the one coming out. Not because the equipment is more powerful, but because the original was oversized to begin with and the house has been tightened since.

A proper load calculation measures the building, not the appliance. Conditioned floor area and volume. Window area, glazing type and orientation. Wall, attic and floor insulation levels, or a realistic estimate where they cannot be seen. Air leakage, which in a 1950s Vancouver bungalow with original sash windows is a completely different number than in a 2015 Langley townhouse. Then it runs those against the outdoor design temperature for your area rather than a national average, because the coast is mild and wet while parts of the Fraser Valley get the Fraser outflow and drop considerably colder.

The output is a heat loss figure the furnace must cover on the coldest expected night, plus a modest margin. Not double. Oversizing is the most common defect we find, and it costs you comfort: the burner satisfies the thermostat fast, shuts off, temperatures stratify, and the house swings. A right-sized unit runs longer, mixes air better and holds the far rooms.

A technician who quotes from the old nameplate and the square footage is guessing. Ask to see the inputs used. If a room has always been cold, say so during the site visit — that is usually a distribution problem the calculation will expose, and it is far cheaper to solve while the equipment is out.

Where it physically fits: closets, crawlspaces and attic installs

Sizing settles capacity. Then the tape measure gets a vote. Older Lower Mainland homes hide furnaces in places nobody would choose today, and cabinet dimensions decide what can actually go there.

Upflow, downflow, horizontal and multi-position configurations exist because basements, crawlspaces and closets all demand something different. A downflow unit in a Richmond rancher discharging into an underfloor plenum cannot be replaced with an upflow cabinet without rebuilding the ductwork. A horizontal unit lying in a low crawlspace off Marine Drive needs service clearance in front of the blower and burner, or the next technician cannot open it without dismantling ducting.

Measure four things before you commit. Cabinet width against the opening and against the existing plenum. Height against the joists, including the vent connection and any A-coil sitting on top. Depth against the door swing or the crawlspace hatch — we have carried units through crawl access barely wider than the cabinet. And the clearances the manufacturer requires around the unit, plus room to pull a filter and reach the electrical disconnect.

Condos and townhouses add their own limits. Furnace closets off a hallway are often built to the exact footprint of the original equipment, with combustion-air grilles sized to it. Attic and mezzanine installs in Fraser Valley two-storeys need a working platform, a light, a switch at the access, and a secondary drain pan with its own drain because a leak there lands in a bedroom ceiling.

The site visit is where these get caught, not install day.

Single-stage, two-stage or modulating: matching the burner to a mild wet winter

Coastal winters are the reason staging matters more here than in colder provinces. A furnace sized for the two or three genuinely cold nights spends the other five months lightly loaded. What it does at part load is what you actually live with.

A single-stage burner fires at one rate: everything, or nothing. It is simple, it has fewer parts to fail and it is cheaper to install. In a well-matched, right-sized application it works fine. In an oversized one it hammers on and off, and you feel every cycle as a draft from the registers.

Two-stage runs a reduced rate most of the time and steps up when the low fire cannot keep up. Longer, quieter cycles. Better mixing between floors, which matters in the split-levels and half-storey additions common across Burnaby and New Westminster. Modulating units go further, trimming the fire across a range and holding a very steady supply temperature.

The blower matters just as much. A constant-torque or variable-speed ECM blower can hold airflow as the filter loads up and can run a low continuous fan speed. That low speed is worth real money in a damp coastal house because moving air continuously evens out humidity and reduces the cold-corner condensation that grows mould on exterior walls.

Higher staging only pays off when the sizing and ductwork are right. Put a modulating furnace on a starved return and you have bought sophistication you cannot use. Fix the airflow first.

Efficiency tiers and what condensing changes about the whole install

Gas furnaces in Canada are rated by AFUE, an annual fuel-utilization efficiency percentage. We are not quoting numbers for any specific model here — check the manufacturer’s published spec sheet or the AHRI listing for the exact model and configuration being proposed, because ratings vary by cabinet, by input and by the coil paired with it.

What matters for planning is the split between condensing and non-condensing designs. A condensing furnace pulls enough heat out of the flue gas that water vapour condenses inside a secondary heat exchanger. That recovered heat is the efficiency gain. It also changes three things about the install permanently: the vent becomes plastic pipe instead of metal, the exhaust is cool and slightly acidic, and the unit produces liquid condensate that must be drained year-round.

So the efficiency decision is not just a line on a quote. It determines whether you can keep the existing chimney or must run new sidewall venting. It determines whether a drain is required where none exists. In a Vancouver character home with a shared masonry chimney also serving an atmospheric water heater, removing the furnace from that chimney can leave the water heater on an oversized flue that no longer drafts properly — that has to be addressed at the same time, not discovered next winter.

Efficiency tiers also drive eligibility for CleanBC and FortisBC programs. Rules and paperwork change, so confirm current requirements directly with the program before you assume anything qualifies. We can tell you what documentation an installer normally has to provide.

Venting a condensing furnace through a Lower Mainland house

Venting is where most retrofit headaches live, because the new furnace rarely wants to go out the same hole as the old one.

A condensing unit vents through approved plastic pipe, sized and length-limited by the manufacturer for that specific model. Every elbow counts against the allowable run. The termination has to sit at a code-required distance from windows that open, doors, soffit vents, gas meters, mechanical air intakes and the property line. On a narrow Vancouver lot with three metres between houses, finding a legal termination point is genuinely the hardest part of the job — and it is why the technician spends time outside during the estimate.

Direct-vent, two-pipe installation brings combustion air from outdoors instead of the mechanical room. Do it wherever you can. It isolates the burner from whatever the house is doing, which matters in tightened homes with range hoods and bathroom fans that can pull a room negative. Single-pipe installs draw combustion air from inside and demand adequate makeup air into the space.

Coastal specifics: keep terminations clear of the snow line and of anywhere ice can build, keep intake and exhaust separated to the spacing the manufacturer requires so you do not recirculate flue gas, and keep the exhaust away from where it will steam onto a neighbour’s window or a walkway. That plume is water vapour and it is visible on cold mornings. Homeowners call about it every year.

Never reuse old vent pipe just because it fits.

Condensate: where the water goes, and why it fails in cold crawlspaces

A condensing furnace makes water whenever it runs. That water is mildly acidic. It has to leave the building reliably, in January, at three in the morning, without freezing.

Start with gravity. If the furnace sits above a suitable drain — a laundry standpipe, a properly trapped floor drain, a sump with an approved discharge — a sloped, supported line is the low-failure-mode answer. Watch the trap: an unused floor drain in a Surrey basement dries out over the summer and then vents sewer gas into the mechanical room. Prime it, or use a trap primer.

Where gravity does not work, a condensate pump lifts it. Pumps are consumables. They clog with the biofilm that grows in the reservoir, the float sticks, and the furnace either shuts down on the safety switch or the reservoir overflows onto the floor. Insist that the pump’s safety switch is actually wired to shut the furnace down. Plenty are not.

Crawlspaces are the Lower Mainland’s specific hazard. An unheated, vented crawlspace under an older Coquitlam or Maple Ridge home can sit at or below freezing during an outflow event. A condensate line run along a foundation wall there will freeze, back up into the furnace and lock it out on a cold night. Route lines through conditioned space wherever possible, insulate and heat-trace what you cannot, and keep runs short with continuous fall.

A neutralizer cartridge protects cast-iron and older plumbing from the acidity. Ask whether yours needs one.

Gas supply, meter capacity and the piping check that happens before quoting

The furnace is one appliance on a system. Before anyone commits to an input rating, the gas side has to be verified end to end.

A technician adds up every connected appliance: furnace, water heater, range, dryer, fireplace, barbecue line, garage heater. That total load, the length of pipe from the meter, the number of fittings and the pipe material determine whether the existing piping can deliver enough gas at the required pressure when several appliances fire together. Long runs from a meter at the front corner of the house to a furnace at the back of a Fraser Valley rancher are exactly where undersized piping hides.

The symptom is not obvious. Everything works until the water heater and the furnace fire at once on a cold morning, pressure sags, the flame goes unstable, flame sense drops out and the furnace locks out. Homeowners describe it as intermittent and blame the new furnace. The pipe was always marginal; the new load exposed it.

The meter itself has a capacity. If the total connected load exceeds it, the gas utility has to be involved to upgrade the meter or the service. That is a scheduling item with a lead time, so it belongs in planning, not in the middle of install day.

All of this is regulated work. Gas fitting in British Columbia requires certification through Technical Safety BC, and the person doing it must hold the right ticket. Every HeatLand gas installation is completed by TSBC-certified gas fitters, and the manometer readings taken at commissioning prove the supply held up under load.

Electrical, thermostat wiring and control compatibility

Furnaces are gas appliances with real electrical requirements, and this is where older homes reveal their age.

The unit needs a dedicated, correctly sized circuit with overcurrent protection matched to the nameplate, plus a service switch within sight of the equipment. In houses with original panels — and there are still plenty across East Vancouver and the older Fraser Valley subdivisions — there may be no spare breaker space, or the panel may be a type that no longer accepts new breakers. That is an electrical scope item to price up front. Bonding and grounding get verified too, including the bond on the gas piping.

Thermostat wiring is the second surprise. A two-stage or variable-speed furnace generally needs more conductors than the two- or four-wire cable stapled up in 1985, and many modern thermostats want a common wire for continuous power. Sometimes an existing cable has spare conductors you can repurpose. Sometimes the wall cavity allows a pull. Sometimes it does not, and the answer is a wireless-capable control or surface-run conduit through a finished wall, which is a conversation to have before the drywall opens.

If the furnace is part of a system with an air conditioner or a heat pump, control compatibility matters more. Dual-fuel arrangements need a control that knows when to run the compressor and when to hand off to gas, and the changeover logic has to be configured on site rather than left at factory defaults.

Spell out on the quote which thermostat is included and who supplies it.

Ductwork and static pressure: the part homeowners never see

Here is the uncomfortable truth about furnace replacement in older housing: the equipment is usually the healthiest part of the system. The ductwork is what limits comfort.

A technician measures total external static pressure across the furnace with a manometer — pressure on the supply side plus pressure on the return, compared against what the blower is rated to handle. High static means the blower is fighting the duct. Airflow drops. Supply temperatures climb. In heating that shows up as a furnace tripping its high-limit switch and cycling; in cooling, as a coil that ices over.

The usual culprits in Lower Mainland homes are on the return side. One undersized central return grille. A return path through a joist bay that someone drilled full of wiring. A filter rack built for a thin filter, later stuffed with a thick high-MERV filter that chokes it. Undersized returns are the single most common defect we measure.

Supply-side problems tend to be add-ons: a basement suite finished in the 1990s with branches tapped off an already-loaded trunk, or long flex runs kinked over a beam in a crawlspace.

None of this requires replacing all the ducting. Usually it is adding a second return, resizing one transition, sealing the plenum joints with mastic and rebuilding the filter rack. The time to do it is while the old furnace is out and the plenums are open. Ask for the measured static pressure before and after — it is the single number that tells you whether the install was finished properly.

Permits, TSBC certification and municipal inspection

A furnace replacement in British Columbia is permitted work. Gas installations fall under Technical Safety BC’s regulatory framework, and in Metro Vancouver several municipalities administer their own gas and mechanical permits through city hall rather than through the provincial body. Vancouver, Surrey and a number of neighbouring municipalities operate their own permitting; others go directly through Technical Safety BC. Your contractor should know which applies at your address and pull it under their licence — not ask you to pull a homeowner permit for work they are performing.

Why this matters beyond compliance. An inspection is an independent set of eyes on venting clearances, gas piping and pressure testing, electrical connection, clearances to combustibles and condensate disposal. It is the only part of the process where someone with no financial interest in the job looks at it.

It also matters when you sell. A furnace installed without a permit is an open question in a home inspection report and a bargaining chip against you. Insurance is a separate conversation — do not take anyone’s word, including ours, about what your policy would do after an incident involving unpermitted gas work. Read your policy or ask your broker directly.

Keep the paperwork. Permit number, inspection result, the equipment serial number, the commissioning readings and the warranty registration confirmation all belong in one folder.

HeatLand installs under our own licence with TSBC-certified gas fitters, pulls the permit for your municipality, and schedules the inspection. Ask for the permit number when the job is booked.

What actually drives the cost of the job

We do not publish furnace prices, because a number without a scope behind it is meaningless and every house on this list changes the answer. What we can do is tell you exactly which variables move it, so you can read any quote intelligently.

Equipment factors: capacity, staging (single-stage, two-stage, modulating), blower type, and whether the model is a condensing design. Cabinet configuration matters too — some orientations are simply less common.

Installation factors, which frequently outweigh the equipment: whether the vent can follow the existing route or needs a new termination through a finished wall; how much sheet-metal transition work the plenums need; whether a condensate pump, neutralizer or heat trace is required; the state of the gas piping and whether the meter can carry the load; whether an electrician is needed for a new circuit or a panel that is full; whether the return needs to be enlarged; access, because a crawlspace or attic install takes measurably longer than a walk-in basement; and disposal of the old unit.

Administrative factors: permit fees, which vary by municipality, and any program paperwork.

Rebates through CleanBC and FortisBC can offset part of a qualifying upgrade, but eligibility, amounts and required documentation change — verify current terms directly with the program before you count on them.

HeatLand provides a free written, no-obligation estimate that itemizes scope rather than handing you a single lump sum. Financing is available. Call (604) 330-3812 to book the site visit.

Installation day, hour by hour

Most single-family changeouts are a one-day job. Add a day when new venting has to cross finished space, when ductwork is being modified, or when an electrician or the gas utility has to attend.

Morning starts with protection: floor coverings from the entry to the mechanical space, and confirmation of where the crew can park and stage material. Then the gas is shut off at the appliance valve, the electrical is locked out at the disconnect, and the old furnace is disconnected, drained if applicable and removed. On crawlspace jobs this is the slow part.

Next comes the base and the transitions. The new cabinet is set level — level matters on a condensing unit, because the secondary heat exchanger and the drain rely on it — and supply and return plenums are fabricated to fit. Then venting: pipe cut, glued, sloped back to the unit per the manufacturer, supported, and terminated outside at the correct clearances. Condensate lines are run and trapped. Gas piping is connected and pressure tested. Electrical is landed and the thermostat wired.

By mid-afternoon the crew is on startup and adjustment, which is covered next. Expect a short interruption to heat and, depending on how the gas is isolated, to hot water. Late in the day you should get a walkthrough: where the filter goes and which way the arrow points, where the disconnect and the gas valve are, how the thermostat is set up, and what the condensate pump sounds like when it cycles.

Old equipment leaves with the crew.

Commissioning, warranty registration and the first year

A furnace that lights is not a furnace that is finished. Commissioning is measurement, and it is the step that gets skipped when a crew is behind schedule.

What gets measured: gas manifold pressure with a manometer, checked against the manufacturer’s specification for that model and adjusted if needed; inlet pressure verified while other gas appliances are firing, to prove the supply holds; temperature rise across the heat exchanger, compared against the range stamped on the rating plate, with blower speed adjusted until it lands inside; total external static pressure, which tells you whether the duct system can support the blower; combustion analysis at the vent; and a check that every safety — flame sensor, pressure switch, high limit, rollout, condensate switch — actually functions. Then the vent termination is inspected and the whole system is cycled from a cold start.

Ask for those readings in writing. A furnace running outside its rated temperature rise will crack a heat exchanger years early, and nobody will connect the two events when it happens.

Warranty registration usually has a deadline measured from the install date and generally requires the equipment to have been installed by a licensed contractor. Confirm the terms with the manufacturer for your specific model and keep the confirmation.

Then the boring part that decides how long it lasts: change the filter on schedule, keep the vent terminations clear of shrubs, snow and nesting birds, and have the unit serviced annually. Test your CO alarms monthly. If you ever smell gas or an alarm sounds, get everyone out and call the gas utility and a licensed technician from outside the home.

Quick Checklist

• Get a room-by-room or whole-house heat-loss calculation, not a match to the old furnace’s nameplate rating
• Confirm the cabinet physically fits, including service clearances, plenum connection and the route to get it into the space
• Walk outside with the technician and agree on the vent and intake termination point before the quote is signed
• Decide where condensate drains, and confirm any pump has its safety switch wired to shut the furnace down
• Have the total connected gas load and existing pipe sizing verified, including meter capacity
• Check panel space for a dedicated circuit and confirm the thermostat wiring supports the furnace’s staging
• Ask for the measured total external static pressure and whether the return needs enlarging
• Confirm the contractor pulls the permit under their own licence and that gas work is done by TSBC-certified fitters
• Get commissioning readings in writing: manifold pressure, temperature rise, static pressure, combustion results
• Register the warranty within the deadline and keep the permit, inspection and readings in one folder

Frequently Asked Questions

Reviewed by the HeatLand Heating & Cooling team — licensed, insured, TSBC-certified HVAC contractor serving Metro Vancouver & the Fraser Valley since 1999. Error codes, specifications, pricing and rebate programs vary by model and change over time; confirm details against your unit’s own manual, a written quote, and the manufacturer or CleanBC/FortisBC. If you smell gas or your CO alarm sounds, leave the home and call the gas utility and a licensed technician from outside.