Your furnace is on its last legs, or your AC just quit, and now everyone has an opinion. Your neighbor swears heat It’s the first cold night of the year. You bump the thermostat up, hear the furnace click on, and then smell that dusty, burning-toast smell drifting out of the vents. Maybe the furnace runs fine. Maybe it shuts off after thirty seconds and tries again. Either way, you start wondering when anyone last actually looked at that thing.
That’s what a fall furnace tune-up is for. The problem is that “tune-up” means different things depending on who shows up at your door. Some companies send a tech who swaps your filter, glances at the burners, and hands you a bill. Others do a real top-to-bottom service that catches problems before they leave you without heat in January.
Here’s the short version: A real furnace tune-up has three parts. The tech cleans the parts that get dirty, tests the safety and combustion components that keep your family safe, and adjusts anything running out of spec. At Falling Star, that takes about one to two hours. Below is the exact checklist our technicians work through, step by step, so you know what you’re paying for and can tell when you’re not getting it.
What Is a Furnace Tune-Up (and What It Isn’t)?
A furnace tune-up is preventive maintenance. It’s not a repair visit. The goal is to get your furnace clean, safe, and running efficiently before the season when it works hardest.
It helps to know the difference between three things people often lump together:
- A filter change is exactly what it sounds like. It’s important, and you can do it yourself. It’s not a tune-up.
- An inspection checks the condition and safety of your equipment, but it usually doesn’t include cleaning or adjustments.
- A tune-up includes the inspection plus hands-on cleaning, testing, and adjustment of the parts that actually wear out.
We’ll say it plainly: if a “tune-up” takes fifteen minutes and the only thing that changed is your filter, you got a filter change with a service fee attached.
Our Furnace Tune-Up Checklist, Step by Step
Every furnace is a little different. A 25-year-old standard-efficiency unit in a Manitou Springs basement doesn’t get serviced exactly like a two-year-old high-efficiency furnace in Briargate. The core checklist stays the same, though. Here’s what our techs do on every visit.
Step 1: We Talk to You First
Before any tools come out, your technician asks a few questions:
- Has the furnace been making any new noises or smells?
- Are any rooms colder than others?
- When was the filter last changed?
- Has it ever shut off on its own or struggled to keep up?
You live with your furnace every day. Your answers often point us straight to what needs the closest look.
Step 2: Thermostat Check and Calibration
We confirm your thermostat is reading the room temperature accurately and actually telling the furnace to turn on and off when it should. A thermostat that’s a few degrees off can make a perfectly good furnace run too long, or not long enough.
Step 3: Air Filter Inspection
We check your filter and replace it if needed. A clogged filter is one of the most common reasons we see furnaces overheat, short-cycle, or shut down. We’ll also tell you how often your home actually needs a new one, because that varies with pets, dust, and filter type.
Step 4: Visual Inspection of the Cabinet and Components
With the power off, we open up the furnace and look for warning signs:
- Rust or corrosion
- Water stains or moisture
- Soot or scorch marks
- Loose or damaged wiring
- Anything that looks out of place
Soot or scorch marks in particular can point to combustion problems, so they get our full attention.
Step 5: Burner Cleaning and Flame Check
Burners collect dust and debris over the summer. That’s a big part of the burning smell you get on the first cold night. We clean and adjust the burners. Then we watch the flame during operation. A healthy gas flame should burn steady and mostly blue. A lazy, yellow, or wavering flame tells us something is off.
Step 6: Flame Sensor Cleaning
The flame sensor is a small metal rod that confirms the burners are actually lit. When it gets coated with carbon buildup, the furnace can’t “see” the flame. It shuts itself off for safety, often just seconds after starting. A dirty flame sensor is one of the most common no-heat calls we get in the winter, and it’s a quick fix during a tune-up.
Step 7: Igniter Inspection
Most modern furnaces use a hot surface igniter instead of a standing pilot light. These parts are fragile and wear out over time. We inspect the igniter for cracks or wear so you’re not finding out it failed on the coldest night of the year.
Step 8: Gas Pressure Check
We measure gas pressure and confirm the furnace is burning the right amount of fuel. This matters more in Colorado Springs than in most places. At roughly 6,000 feet, there’s less oxygen in the air, so furnaces have to be set up correctly for our altitude to burn cleanly and safely.
Step 9: Heat Exchanger Inspection
The heat exchanger keeps combustion gases separate from the air you breathe. A cracked heat exchanger is one of the most serious problems a furnace can have, because it can allow carbon monoxide to get into your home. We inspect it carefully on every tune-up.
Step 10: Venting, Flue, and Combustion Air
We make sure exhaust is leaving your home the way it should, and that the furnace is getting enough fresh air to burn properly:
- Older and standard-efficiency furnaces: We check the metal flue pipe for corrosion, gaps, and blockages.
- High-efficiency furnaces: We check the white PVC intake and exhaust pipes for blockages. In Colorado, those pipes can get blocked by snow, ice, leaves, and occasionally a bird’s nest.
- Condensate drain: High-efficiency furnaces also have a condensate drain and trap that we clean and test. A clogged drain can shut a furnace down.
Colorado Springs Utilities specifically recommends having a contractor check your vent cap after hailstorms. That’s a very Front Range problem, and we look for hail damage as part of this step.
Step 11: Electrical Connections and Components
Thousands of on-and-off cycles loosen electrical connections over time. Loose connections run hot, and heat is what kills components early. We tighten connections and test key electrical parts. That includes the blower capacitor, which often tests weak months before it actually fails.
Step 12: Blower Motor and Wheel
The blower moves warm air through your ducts. We clean the blower wheel, check the motor, and lubricate moving parts where the manufacturer calls for it. A dirty blower wheel can noticeably cut airflow, which makes your furnace work harder for less heat.
Step 13: Safety Controls
Your furnace has several built-in safety devices designed to shut it down if something goes wrong. We test them to make sure they’ll actually do their job. These include:
- The high-limit switch, which shuts the furnace down if it overheats
- Rollout switches, which detect flames escaping where they shouldn’t
- The pressure switch and inducer motor, which confirm exhaust is venting properly before the burners light
Step 14: Carbon Monoxide Check
We test for carbon monoxide at the furnace as part of every tune-up. Your technician uses a CO meter to check two things:
- Around the furnace and in the surrounding room, to confirm no CO is escaping into your living space.
- The combustion process itself, to confirm the furnace is burning cleanly and exhaust gases are venting out of your home the way they should.
A furnace that’s burning dirty or venting poorly can produce carbon monoxide long before you’d ever notice a problem. Testing is the only way to know for sure.
We also ask whether you have working carbon monoxide detectors. The CDC recommends having gas-burning heating systems serviced by a qualified technician every year, and installing CO detectors near every sleeping area. Carbon monoxide is colorless and odorless, and a detector is the only way you’ll know it’s there. If your detectors are missing or more than a few years old, we’ll let you know.
Step 15: Full Cycle Test and Airflow Check
Finally, we run the furnace through a complete heating cycle from start to finish. We watch the startup sequence and measure temperature rise. We check airflow at the vents. We listen for anything that doesn’t sound right. If something is off, this is where it shows up.
Step 16: We Walk You Through What We Found
Before we leave, your technician explains what we checked, what we cleaned, and anything that needs attention. If something needs repair, we’ll tell you straight: what it is, how urgent it is, and what it costs. We won’t do any extra work without talking to you first. If something can wait, we’ll tell you that, too.
Why Colorado Springs Furnaces Need a Fall Tune-Up
Furnaces work harder here than in most of the country, for a few reasons:
- Altitude. At around 6,000 feet, combustion has less oxygen to work with. Furnaces need correct gas pressure and clean burners to burn safely and efficiently.
- Big temperature swings. It’s common to go from the 60s in the afternoon to the 20s overnight. That means more on-and-off cycling, and more wear on igniters, flame sensors, and electrical parts.
- Dry air and dust. Wind off the plains brings dust, and our dry air is hard on seals and gaskets.
- Hail. Spring and summer hail can damage furnace vent caps on your roof without you ever noticing.
- A long heating season. Our furnaces often run from October into May.
That’s why fall is the time to get it done. You want any problem found in October, on your schedule. You don’t want to find it during a January cold snap when every HVAC company in town is booked solid.
How Long Does a Furnace Tune-Up Take?
Most of our furnace tune-ups take about one to two hours. Older systems, furnaces in tight crawlspaces or attics, and units that haven’t been serviced in a few years can take longer. Anything much shorter than an hour is worth asking questions about.
How Much Does a Furnace Tune-Up Cost?
Nationally, a professional furnace tune-up typically runs somewhere in the range of $150 to $300. The price depends on your furnace type, its age, and how much cleaning it needs.
For Falling Star’s current pricing, check our furnace tune-up specials. If you’d rather never think about scheduling it again, a Comfort Club maintenance plan includes a fall furnace tune-up and a spring AC tune-up every year, plus priority scheduling and repair discounts.
What You Can Do Yourself (and What You Shouldn’t)
There’s a clear line here.
Safe to do yourself:
- Change your filter every one to three months, and more often during heavy winter use
- Keep vents and return grilles clear of furniture and rugs
- Make sure high-efficiency furnace vent pipes outside are clear of snow and debris
- Test your carbon monoxide detectors
- Pay attention to new noises, smells, or short cycling
Leave to a licensed technician:
- Gas pressure checks and adjustments
- Heat exchanger inspection
- Combustion and CO testing
- Electrical testing
- Anything involving the gas line or burners
That’s not about protecting our business. Gas and combustion work can be genuinely dangerous without the right training and tools. DIY work can also void your manufacturer’s warranty, and many manufacturers require proof of professional maintenance to keep that warranty valid. For more, see our list of winter furnace maintenance mistakes we see homeowners make every year.
How to Tell If You Got a Real Tune-Up
Comparing HVAC companies? Here’s how to know whether you got real maintenance or a rushed visit:
- It took more than 15–20 minutes. A real tune-up usually takes an hour or more.
- The tech actually opened the furnace. Cleaning burners, the flame sensor, and the blower requires getting inside.
- They tested safety components. That includes gas pressure, the heat exchanger, and safety switches, not just a visual glance.
- They explained what they found. You should know what was checked and what condition it’s in.
- There was no high-pressure upsell. A good tech tells you what needs fixing, what can wait, and what doesn’t need doing at all.
If you’re not sure what you got last time, our post on whether HVAC maintenance is really necessary walks through what a real maintenance visit should look like.
FAQs About Furnace Tune-Ups
What does a furnace tune-up include?
A complete tune-up includes:
- Cleaning: burners, flame sensor, and blower
- Inspection: heat exchanger, igniter, venting, and electrical connections
- Testing: gas pressure and safety controls
- Wrap-up: a full heating cycle test
You should also get a clear explanation of anything that needs attention.
How often should I get a furnace tune-up?
Once a year, ideally in the fall before heating season starts. Annual service is also what many manufacturers require to keep your warranty valid.
Is a furnace tune-up worth it?
For most homeowners, yes. A tune-up costs a fraction of an emergency repair. It helps your furnace run more efficiently, and it catches safety problems like cracked heat exchangers or venting issues before they become dangerous.
What’s the difference between a furnace tune-up and a furnace inspection?
An inspection checks the condition and safety of your furnace. A tune-up includes that inspection plus hands-on cleaning and adjustments. If your furnace hasn’t been cleaned in a year or more, you want a tune-up.
Can a tune-up fix a furnace that keeps turning on and off?
Sometimes. A dirty flame sensor, clogged filter, or blocked vent pipe can all cause short cycling, and all of them are checked during a tune-up. If the cause is a failing part, it may need a repair. Learn more about why your furnace keeps turning on and off.
When is the best time to schedule a fall furnace tune-up?
September through early November is ideal: after the summer heat, before the first real cold snap. Booking early also helps you avoid the rush that hits every HVAC company once temperatures drop.
What should I do if my furnace isn’t working right now?
If your furnace has already stopped working, you need a repair visit, not a tune-up. Our furnace repair team is available 24/7 for emergencies.
Schedule Your Fall Furnace Tune-Up With Falling Star
Here’s the truth: most furnace breakdowns don’t come out of nowhere. They start as a dirty flame sensor, a weak capacitor, or a cracked igniter. Small stuff that a good tech catches in October, long before it leaves your family in the cold in January.
At Falling Star Heating and Cooling, we run every tune-up the same way we were trained to do every job in the service: thorough, by the checklist, and honest about what we find. We’re a veteran-owned Colorado Springs company. We won’t push repairs you don’t need, and we won’t skip the parts of the job nobody’s watching.
Check out our current furnace tune-up specials, learn more about our furnace maintenance services, or book your tune-up today. Prefer to talk to a person? Call us at 719-217-1681.
