A furnace tune-up should be more than a quick look. See what a full visit includes and what St. Louis homeowners can ask before booking.
Every fall, St. Louis homeowners hear the same advice: get the furnace tuned up before the cold. Fewer hear what that visit should include, or how to tell a real inspection from a quick look followed by a sales pitch.
Thomas Hoffmann Air Conditioning & Heating is a locally owned St. Louis company, not a national HVAC chain. It is run by Tom Hoffmann, Master HVAC Engineer, with 30+ years of experience.
What a Furnace Tune-Up Should Cover
A tune-up is an inspection, a cleaning, and a set of tests. On a gas furnace, a thorough visit generally includes:
- Thermostat: confirming it calls for heat and the furnace responds
- Air filter: checked and changed if needed
- Burners and ignition: inspected and cleaned so the furnace lights reliably
- Flame sensor: cleaned, since a dirty sensor is a common reason a furnace shuts off soon after lighting
- Heat exchanger: inspected for visible cracks or corrosion
- Blower motor and wheel: checked for dirt, wear, and unusual noise
- Electrical connections and safety controls: tightened and tested
- Venting and flue: checked for blockage, corrosion, or loose joints
- Condensate drain: cleared on high-efficiency furnaces
- Operating test: a full heating cycle, with readings compared to the manufacturer’s range
The exact steps depend on the system. A 20-year-old furnace and a three-year-old high-efficiency model need different attention, and a good technician adjusts the visit to the equipment in front of them.
What a Tune-Up Can and Cannot Tell You
A tune-up can catch worn parts before they fail, and it may help the furnace run closer to its rated efficiency. It also gives you a record of the system’s condition, which is useful if you sell the home or plan a replacement. Some manufacturer warranties ask for proof of regular maintenance, so check your paperwork.
What it cannot do is promise a winter without repairs. A furnace that passes in November could still have a part fail in January. Be cautious with any company that says otherwise.
For an older furnace, the visit is also a chance to get an honest read on how much life the system may have left. That lets you plan ahead instead of deciding in a hurry on a cold night.
Questions to Ask Before You Book
These questions work with any company, including ours.
- What is on the checklist? Ask to see it in writing. If nobody can tell you what the visit includes, expect a short one.
- Who will be in my home? Ask whether the technician is a company employee and what training they have on your type of furnace.
- Will I get a written report? You should leave the visit with notes on what was checked, what was cleaned, and any readings taken.
- What happens if you find a problem? A good answer: the technician shows you the part or the reading, explains your options, and gives a written quote before any work starts. You should have time to decide.
- Who owns the company? Ask who you can call if something is not right afterward, and whether that person is in St. Louis.
Why Local Ownership Matters for Maintenance
Many HVAC companies advertising in St. Louis under local-sounding names are part of national chains. That is worth knowing before you invite someone to evaluate your furnace, because a tune-up is where recommendations begin.
With a locally owned company, the owner is accountable for what the technician tells you. An honest visit ends with a clear report on your system. It does not end with pressure to replace a furnace that may have years of service left.
When to Schedule
Before the first hard cold is ideal, since problems tend to show up at the first heavy use. If November has slipped by, a mid-season tune-up is still worth doing. Most manufacturers recommend service once a year.
If the furnace is already acting up (no heat, short run times, new noises), that is a repair visit, not a tune-up. See our furnace and heating repair service. Two safety notes. If a carbon monoxide alarm sounds, leave the house and call 911. If you smell gas, leave the house and call Spire’s gas emergency line at 800-887-4173.
Schedule a Furnace Tune-Up
in St. Louis
Call Thomas Hoffmann Air Conditioning & Heating at (314) 471-7625 to schedule a tune-up with a locally owned St. Louis company. Prefer to write? Send a request through our contact page.
Frequently Asked Questions
It depends on the system’s age, type, and condition. A thorough visit takes long enough to complete the checklist and run the furnace through a full heating cycle. A visit that is over in a few minutes likely skipped steps.
Once a year is the common recommendation from manufacturers, ideally before heating season. Systems that run hard or have a history of problems may benefit from closer attention.
Often, yes. A newer furnace still collects dirt, and an early visit could catch an installation or setup issue while it is simple to correct. It may also matter for the warranty, depending on the manufacturer’s terms.
It may. A clean filter, clean burners, and a correctly adjusted system help a furnace run closer to its rated efficiency. Results depend on the system and the home.