Furnace quote red flags, and the green flags to look for
Most bad quotes are not scams. They are vague, rushed or missing lines, and the gaps cost you later. Here is how to spot them and what a good quote shows instead.
Updated By the FurnaceQuotes.ca editorial team9 min read
The short answer
- The most common problem is vagueness: no model number, no sizing method, "materials as required". Ask for the missing lines in writing.
- The second is pressure: sign-today prices, big deposits and rebate promises. A fair price holds long enough to compare.
- In Ontario a company cannot sign you up for a furnace, AC or water heater at your door unless you invited it, and contracts signed at home have a 10-day cooling-off period.
- Green flags: a heat loss calculation, itemised lines with model numbers, a TSSA registration number, written warranty terms and a realistic date.
Few homeowners collecting furnace quotes in Ontario meet an outright fraud. Far more sign a quote missing the details needed to hold a company to a scope, a price or a date. One flag is a reason to ask questions. Three or four is a reason to get another quote.
Red flags and green flags at a glance
Red flags
No brand or model number
"96% high-efficiency furnace" could be several models at very different prices.
Sized "same as the old one"
Without a heat loss calculation, the size is a guess.
Sign-today pricing
A discount that expires tonight is there to stop you comparing.
A rebate amount promised
Heat pump rebates need approval before installation, and a gas furnace alone is not a heat pump measure.
A door-to-door or "government program" pitch
Ontario restricts door-to-door contracts for furnaces, air conditioners and water heaters.
A large deposit up front
Half or more before any work starts leaves you holding the risk.
Vague "misc. materials" lines
A large unexplained line is where padding hides.
No mention of permits, gas work or TSSA
Only a TSSA-registered contractor may do the gas work.
A price far outside typical ranges
Far below can mean missing scope; far above can mean padding.
Rental payments that rise every year
Escalators, long terms and steep buyouts can cost more than buying.
Green flags
A heat loss calculation
Room by room (CSA F280), with the result written down.
Itemised lines with model numbers
Equipment, venting, condensate, ducts, thermostat and removal each named.
A TSSA registration number
On the quote, and it checks out in TSSA's public registry.
Written warranty terms
Parts, heat exchanger and labour years listed separately.
Permits and gas work spelled out
Who arranges any permit, plus a gas pressure or leak test.
A price that holds
Long enough to compare, often 30 days.
Fair payment terms
A modest deposit, with the balance due when it works.
A realistic install date
A date and a duration, with no rush to sign.
Want a quote with every green flag? One request, one free in-home estimate.
Get A Free QuoteWhat a vague quote looks like
Vague quotes look short and confident, not suspicious. Here is the job from our annotated sample, written the vague way, with each gap marked.
Example Heating Ltd.
Quotation
No. 0117
Date: today
- Supply and install high-efficiency gas furnace, 96%$6,900
- Size: to match existing unit
- Venting and materials as required$650
- Misc. parts and labour$400
- Rebate eligible, we handle the paperwork
Special price valid today only. 50% deposit on signing.
No brand, model or capacity
Single-stage and two-stage furnaces sit in different typical ranges ($4,000 to $6,500 and $5,500 to $8,000). This line could be either.
Sized to match the old unit
No heat loss calculation, so the size is a guess.
Venting "as required"
No material, route or exit, and nothing about the water heater chimney. New venting or a liner can add $300 to $1,500.
Misc. parts and labour
A round number with no detail.
Rebate implied
A gas furnace alone is not a heat pump rebate measure, and programs need approval first.
No HST line
You cannot tell whether $7,950 includes the 13% HST, a difference of about $1,034.
Today-only price, 50% deposit
Pressure to skip comparing, and half the price at risk before any work starts.
Not on the page at all
Permits and a gas test, the TSSA registration number, condensate, thermostat, removal, warranty terms and an install date.
Anything not written down becomes an extra on install day. Ask for the missing lines in writing, using the full list in what a furnace quote should include. Good companies rarely mind.
Pressure: sign-today prices and big deposits
A price that expires tonight is the clearest pressure tactic: a real price does not change between this evening and Thursday. A quote valid for a week or a month is normal; one valid for a single visit is not. A modest deposit to order equipment is standard, but half the price on signing leaves you exposed if the job stalls.
If you do sign in your own home, Ontario gives you a 10-day cooling-off period from the day you receive a written copy. If you ask for installation inside those 10 days, you may still owe some costs.
Rebate promises
Treat any rebate figure on a furnace quote with suspicion. Heat pump rebates never cover a standalone gas furnace, and they need approval before installation, so "we handle the rebate, just sign today" gets the order backwards.
Rebates: check before you sign
Heat pump rebates do not cover a standalone gas furnace or a cooling-only air conditioner, so do not count on a rebate for a straight furnace or AC replacement.
Ontario's Home Renovation Savings program offers heat pump rebates with eligibility rules by heating fuel, home type and product, and it requires approval before installation. Program rules change often, so check the official pages before you buy and never sign because of a promised rebate amount. New applications for the Canada Greener Homes Loan ended on October 1, 2025.
Door-to-door and "government program" pitches
In Ontario, a business cannot sign you up in your home for a furnace, air conditioner, water heater, air cleaner, water treatment device or duct cleaning unless you contacted it first and invited it over to buy or lease one. Inviting someone for a repair, maintenance or an energy assessment does not count. A contract that comes out of restricted door-to-door marketing is void, and you can keep the goods or services without obligation. Be wary of anyone claiming a government program or your utility sent them.
Ontario's Homeowner Protection Act, 2024 prohibits registering a notice of security interest (NOSI) on title for consumer goods such as furnaces, air conditioners and water heaters. The contract itself still applies. Details are on the Ontario government's NOSI page. Still ask whether a company will register a lien on your title, and see the door-to-door sales page for your other rights.
Prefer a quote you asked for? Request one, and a participating local company books a free in-home estimate.
Get A Free QuoteWhen the price is far outside the range
A quote far below the range usually means missing scope, not a bargain. One far above can mean premium equipment, hard venting, ductwork or padding. Typical installed prices in Ontario:
- Single-stage gas furnace (95 to 96% AFUE)
- $4,000 to $6,500
- Two-stage gas furnace (96% AFUE, ECM blower)
- $5,500 to $8,000
- Modulating gas furnace (97 to 98% AFUE, variable-speed blower)
- $7,000 to $11,000
- New furnace and central AC in one job
- $8,000 to $15,000
Typical Ontario prices in CAD, before 13% HST. Reviewed October 2026. Ranges, not quotes.
The quote checker gives a fair, high or low read with reasons. If two quotes for the same scope are thousands apart, ask each company to walk you through its lines.
Repair quotes: refrigerant top-ups and heat exchanger calls
Air conditioners are sealed systems. One that is low on refrigerant has a leak, and topping it up without finding the leak means paying again next summer. A proper leak repair and recharge typically costs $400 to $1,500. See AC repair.
On furnaces, watch for "your heat exchanger is cracked, you need a new furnace". It can be true and is a real safety issue: if a technician shuts the furnace off as unsafe, do not restart it. Ask to see the evidence (a photo, camera inspection or combustion readings) and get a second opinion quickly. Many no-heat calls are smaller fixes, like an igniter ($250 to $450) or flame sensor ($150 to $300). Our furnace repair page lists typical prices.
Rental contracts that cost more than buying
Furnace rental plans in Ontario usually cost $40 to $80 a month on 10 to 15 year terms. A low monthly number can hide a high total:
| Option | Monthly payment | Total paid |
|---|---|---|
| Rent, flat, 10 years | $60 | $7,200 |
| Rent, flat, 15 years | $60 | $10,800 |
| Rent, rising 3.5% a year, 15 years | $60 rising to $97 | $13,893 |
| Buy a single-stage furnace, installed | None | $4,000 to $6,500 |
Before signing a rental, ask for the total of all payments, the yearly increase, the buyout price in each year and what happens if you sell. Our guide to financing versus renting compares the options.
What to do if you spot a red flag
Do not sign on the spot
Keep the quote and take a day. A fair offer survives the weekend.
Ask for the missing lines in writing
Model numbers, sizing, venting, permits, warranty and terms. Email gives you a record.
Check the TSSA registration
Search the company in TSSA's fuels contractor registry.
Run the numbers
Put the price through the quote checker.
Get a second quote for the same scope
One clear comparison beats three vague ones. See how many quotes to get.
Already signed at home?
You have 10 days from receiving the written copy to cancel. Cancel in writing and keep proof of the date.
More guides are in the Quote Guide.
Common questions
Straight answers. If yours is not here, the company can answer it during your free estimate.
Can I cancel a furnace contract I signed at home in Ontario?
Yes, within the 10-day cooling-off period that starts when you receive a written copy of the agreement, for any reason. If the sale came from restricted door-to-door marketing, the contract can be void. Cancel in writing and keep proof of the date.
How do I check if a furnace company is TSSA registered?
Ask for the registration number, then search the company name or number in TSSA's online registry of authorized heating fuel contractors. It shows whether the registration is active and which fuels it covers. In Ontario, gas furnace work is restricted to TSSA-registered contractors.
Is a very cheap furnace quote a red flag?
Often, but usually because something is missing, not because it is a scam. Check it for venting, condensate, duct connections, permits and the warranty. Once the scope matches a higher quote, the gap tends to shrink. A low price with a complete scope and a real model number can be a good deal.
Is it a red flag if a contractor will not do a load calculation?
It is at least a yellow flag. Experience can size a straight replacement sensibly, but the company should explain its choice. If it will not, or two quotes differ widely on size, ask for a CSA F280 heat loss calculation before you sign.
Are furnace rental contracts a bad deal?
Not always, but they cost more over time than most people expect. Ask for the total of all payments, the yearly increase, the buyout price in each year and what happens if you sell, then compare that total with buying or financing plus a yearly tune-up.
Get a second quote before you sign
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