Your Furnace Is Telling You Something — Are You Actually Listening?

Every autumn, Ontario homeowners face the same dilemma: the furnace isn't working properly, and you have to decide whether to fix it again or finally replace it. Making the wrong call in either direction costs money. Here are five clear signs that replacement — not repair — is the right move.

1. Your Furnace Is Over 15 Years Old

The average furnace lifespan is 15-20 years. After 15 years, the heat exchanger, burners, and blower motor are all approaching the end of their reliable service life. Even if the furnace is still running, it's operating at reduced efficiency — often 20-30% less efficient than when it was new.

The math usually works out clearly: a furnace over 15 years old that needs a $600 repair is a furnace that will need another $600 repair in 12-18 months. At some point, you're paying for repairs on a system you're going to replace anyway.

2. Your Heating Bills Have Increased Significantly

If your gas bill has climbed noticeably over the past few years — even accounting for rate increases — your furnace's efficiency has degraded. An old furnace operating at 70% efficiency costs 37% more to run than a new 96% AFUE unit heating the same space. In Ontario, where natural gas prices fluctuate, this adds up fast.

A new high-efficiency furnace can reduce your heating costs by $400-800 per year depending on your home size and current unit's age.

3. You've Repaired It More Than Once in the Past Two Years

One repair in three years is normal. Two or more repairs in the past 24 months is a pattern — and patterns with aging furnaces tend to accelerate, not slow down. Apply the 50% rule: if the cost of your next repair exceeds 50% of the cost of a new furnace, replace it.

For context: a new Midea MGV96 installs for $3,222. If your repair quote is over $1,600 — replace it.

4. Uneven Heating — Some Rooms Too Hot, Others Too Cold

When a furnace starts losing its ability to distribute heat evenly throughout a home, it's usually a sign of a failing blower motor, a compromised heat exchanger, or ductwork issues related to the unit's declining output. If you're constantly adjusting registers and thermostats and still can't get consistent comfort, the furnace itself is likely the root cause.

5. The Furnace Makes New or Unusual Noises

A furnace that bangs, rattles, pops, or screeches is communicating a problem. Specific sounds and what they usually mean:

• Banging or popping at startup — delayed ignition or expanding/contracting ductwork. Can indicate a cracked heat exchanger.
• Screeching or squealing — worn blower motor bearings. Often repairable, but in an old unit, signals broader wear.
• Rattling — loose panels or failing blower. Check panels first; if noise persists, it's internal.
• Rumbling when off — burner deposits or delayed ignition. Get this inspected immediately — it can be a safety issue.

What Does a New Furnace Cost in Ontario?

Option	Model	Monthly Rental	Purchase
Good	Lennox ML196	$43.99/mo	$3,555
Better	Midea MGV96	$43.99/mo	$3,222
Better	Lennox ML296	$47.99/mo	$4,555
Best	Lennox EL297	$55.99/mo	$5,555

We Serve All of Ontario

GT Home Services provides furnace replacement across Ontario including: