It is late October, the furnace is running again, and something is off. Maybe it took two tries to light this morning. Maybe a technician just handed you a repair quote that made you wince. Maybe it is simply old, and you have been wondering every fall whether this is the winter it quits.
Repair it one more time, or replace it before the cold? There is no answer that fits every house, but there is a short list of questions that settles it for most of them. Here is how we walk customers through it.
The four questions that decide it
1. How old is it? Look for the manufacture date on the data plate inside the furnace door, or in the serial number. Most gas furnaces along the Wasatch Front give 15 to 20 years. Under 12 years old, repair almost always wins. Past 15, think hard before putting serious money into it.
2. What is breaking? Not all repairs are equal. The small ones, a dirty flame sensor, a worn igniter, a stuck pressure switch, a clogged condensate line, are routine on a furnace of any age. The big ones are the inducer motor, the blower motor, the control board, and the gas valve. A big repair on a furnace past 15 years is where replacement starts to make more sense.
3. How often are we meeting? One service call in several winters is normal wear. A repair every winter is a pattern. Furnace parts age together, because they have all run through the same Utah winters, and a furnace that needed an inducer last year and a board this year is telling you something.
4. Is the house comfortable? Rooms that never warm up, a furnace that runs and runs, a gas bill that climbs with the same thermostat setting. Some of that is ductwork or a filter, and we will say so if it is. But an old furnace in a house that has had its windows and insulation upgraded is often the wrong size now, and no repair fixes that. Our guide to 80% vs. 96% furnaces covers which efficiency makes sense for a Utah house.
The one repair that changes everything
The heat exchanger is the metal wall between the flame and the air you breathe. When it cracks, exhaust can leak into the house air, so a furnace with a confirmed crack should not run. On an older furnace, a cracked heat exchanger is a replacement conversation.
It is also the call that gets abused the most, because it is scary and it sells furnaces. So if anyone tells you yours is cracked, from us or anyone else, ask to see it: a photo or a camera view of the actual crack. A real finding is easy to show. If you have a replacement quote built on a crack nobody showed you, we will give you a free written second opinion.
If you ever smell gas, leave the house first and call Enbridge Gas from outside. If a carbon monoxide alarm sounds, get everyone out and call 911. Our carbon monoxide safety guide covers the warning signs.
Finding out does not cost much
You do not have to decide blind. Our diagnostic is a flat $69: a technician looks at the actual furnace and tells you what is wrong and what it costs to fix. If you go ahead with the repair, the $69 is waived. If the honest answer is that the furnace is done, the $69 is credited toward the new one. You never pay to find out what is wrong and then pay again to act on it.
That setup is on purpose. It takes away our reason to talk you into anything, because the diagnosis is the same whichever way you decide. If a repair makes more sense, we will tell you.
If replacement wins
A few things worth knowing before you collect estimates, from us or anyone else:
- A real quote follows a real look at the house. The new furnace should be sized for your home’s heat loss and corrected for our altitude, not copied from the old label. Our checklist of what a furnace estimate should include shows what to look for, and the red flags.
- Every Lucas replacement is finished the same day it starts. Old furnace out in the morning, new one heating by evening, so you never spend a night without heat. Our furnace installation page walks through the process.
- Every install carries our free 5-year labor warranty, in writing.
- High-efficiency furnaces can earn a rebate. Enbridge Gas’s ThermWise program pays $300 to $350 on qualifying 95%+ furnaces in 2026. Current amounts and the fine print are on our rebates page.
- Spreading the cost out is fine. Financing is available, including Snap Finance for customers with an ITIN and a bank account, and checking what you qualify for will not affect your credit.
Why fall is the calm time to decide
When the first real cold snap hits the Wasatch Front, every tired furnace in the valley gets tested the same night, and every heating company’s phone rings at once. That is the worst moment to make a big decision: the house is getting cold, you take whatever install day is left, and you have no time to compare.
Decide in the fall and you pick the day. You compare estimates calmly, the furnace is replaced in one day, and you start the winter with a warranty instead of a worry. That is the whole idea behind our Beat the First Cold campaign: no deadline, no price games, just better timing.
Not sure which side of the line your furnace is on? Book the $69 diagnostic or call or text (801) 678-5748, Monday through Friday, 8 AM to 8 PM, in English or Spanish. If it is worth fixing, we will fix it. If it is not, we will show you why.