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What Is a Furnace Tune-Up?
A furnace tune-up is a documented annual inspection, cleaning, and performance test of your heating system, covering roughly 20 individual checkpoints in about an hour. It is not a repair visit and it is not a quick filter swap. During a tune-up, a certified technician measures what your furnace is actually doing: gas pressure, ignition performance, combustion quality, blower operation, and heat-exchanger condition. They will then compare those readings against the manufacturer's specifications.
Most furnace failures do not happen suddenly. A cracked heat exchanger, a weakening ignitor, or a drifting gas valve develops over months of run time. A tune-up is the routine, scheduled visit designed to find those developing faults while they are still small, and a combustion inspection is the only routine check that finds a developing heat-exchanger fault before it becomes a safety shutdown. When an inspection does uncover a fault, our team can handle the furnace repair directly, usually on the same visit.
How Often Should a Furnace Be Serviced?
A furnace should be serviced once every year, without exception. There are two reasons that number is not negotiable.
First, most furnace manufacturers condition parts-warranty coverage on documented annual service. That is a permanent contractual clause written into your warranty terms. Skip a year, lose the paper trail, and a covered part failure can become an uncovered one.
Second, a furnace in Northern Colorado logs a long, hard heating season at 4,600+ feet of elevation, where thinner air changes how combustion behaves. Twelve months of run time is enough for filters to load, burners to foul, and moving parts to drift out of adjustment.
Every McCormick maintenance visit ends with a written service record, so the documentation your warranty requires exists the day you might need it.
What Are the Signs Your Furnace Was Not Serviced Last Year?
A furnace that skipped last year's service usually says so. You just have to know what to listen and look for:
Sign #1
A burning-dust smell that lasts beyond the first hour of the season. A brief smell at first startup is normal. One that lingers means buildup on the burners and heat exchanger that should have been cleaned off.
Sign #2
A filter that is gray and collapsed rather than dusty. A collapsed filter has been starving the blower of air for months, forcing the motor to work harder every cycle.
Sign #3
Longer runtimes to reach the same temperature. If the house takes noticeably longer to reach setpoint than it did last winter, efficiency has slipped. And slipping efficiency is a symptom, not just an inconvenience.
Sign #4
You have an 80% AFUE builder-grade unit installed in the mid-2000s. These were fitted by the truckload during the building boom, chosen by builders rather than homeowners, and most are now past the age where they run the way they were rated to.
Sign #5
The furnace short cycles. This is the signature of a unit that was oversized when it was fitted. It blasts heat, overshoots the thermostat, and shuts down before the air ever reaches the far rooms, then the constant starts wear out the very components that keep failing.
If your furnace is younger, structurally sound, and simply misbehaving, repair may still be the right call. Our furnace repair team will tell you honestly which side of the line you're on, because a replacement sold to someone who didn't need one comes back to us in reviews, and we like our reviews the way they are.
When Should a Northern Colorado Furnace Be Serviced?
A Northern Colorado furnace should be serviced between August and November, before the first sustained cold arrives. Pre-season scheduling exists for a practical reason: October through January is when every deferred fault surfaces at once. A furnace that sat idle since April gets switched on across thousands of homes in the same two-week cold snap, and the systems that were going to fail, fail together.
Booking your tune-up in late summer or early fall means any fault we find gets corrected on your schedule, with parts ordered on time, instead of during a no-heat call in the middle of a January night. It is the difference between maintenance you plan and a breakdown you endure.
McCormick provides emergency service when the worst does happen, but the entire point of a tune-up is that you never have to need it.
What Does a McCormick Tune-Up Include?
A McCormick furnace tune-up includes three phases of work: safety checks, performance testing, and cleaning. These are performed by a NATE & EPA Certified technician and closed out with written documentation.
1
Safety checks. We verify thermostat and blower functionality, gas pressure levels, belt tension and voltage, and ignition and gas connectivity. More importantly, we test for carbon monoxide leaks. Because your furnace's heat exchanger separates combustion gases from the air your family breathes, its inspection is the single most important item on the list.
2
Performance testing. We test the heat exchanger, exhaust and venting systems, ignition system, and all system controls against manufacturer specifications, so we can tell you not just that the furnace runs, but how well it runs.
3
Cleaning and adjustment. We clean the burners, replace or clean air filters, clean the interior and exterior of the unit, lubricate moving parts, and tighten electrical connections.
4
Documentation. You receive a written service record noting what was inspected, what was measured, and what, if anything, needs attention. This is the document your manufacturer warranty requires, and it stays in your file with us as well.
If the inspection turns up a system near the end of its life, we will tell you plainly and can walk you through furnace installation and replacement options. Most furnaces we inspect need exactly what they came for: a tune-up.
How Do I Book a Furnace Tune-Up? Three Steps.
Scheduling furnace maintenance with McCormick takes three steps from first call to finished paperwork:
Step 2
A NATE-certified technician inspects, cleans, measures combustion, and documents the results — typically in about an hour.
Step 3
You receive the written service record your manufacturer warranty requires, plus a plain-language summary of your system's condition.
That is the whole process. No contracts to sign before we arrive, no upsell script when we do.
Why Choose McCormick for Furnace Maintenance in Greeley?
Furnace maintenance from McCormick comes backed by the things that are hard to fake:
800+ reviews on Google — real feedback from Northern Colorado homeowners, visible right on our profile.
NATE & EPA Certified technicians — the technician tuning your furnace holds the industry's leading certifications, not just a company badge.
Satisfaction Guaranteed on every job — if you're not happy with the work, we make it right.
Armstrong Air dealer — we install and service equipment we stand behind.
Emergency service available — when heating fails outside business hours, we answer.
Greeley locals — our shop is at 2881 S 31st Ave, Unit 3, Greeley, CO 80631, which means the person tuning your furnace lives with the same winters you do.
McCormick was founded by Jesse Trout, a Colorado native and HVAC expert. We remain a residential heating and cooling company by deliberate choice: we do one category of work and we do it thoroughly.
Furnace tune-ups are one part of our full range of heating services, and when a tune-up reveals a filtration or air-cleanliness issue, our indoor air quality team can address it as well.
🚩 TRANSFORMATION PROOF
Where Does McCormick Provide Furnace Maintenance?
Furnace tune-up service is available throughout Northern Colorado, including Greeley, Loveland, Longmont, and Fort Collins. If you are anywhere in the region and searching for a furnace tune-up near you, there is a strong chance we already service your street.
Don't Let the First Cold Night Be Your Furnace's First Test
Every winter, the no-heat calls we run in January trace back to the same thing: a small fault that a pre-season tune-up would have caught in September. Your furnace is going to be asked to work hard for the next six months. Give it one hour of attention first and get the written record your warranty depends on while you're at it.
McCormick Heating & Cooling · 2881 S 31st Ave #3, Greeley, CO 80631, United States · Mon–Fri 8am–5pm
