Before the first hard freeze
Furnace Tune-Up in Pueblo, CO
The best time to find a weak igniter or a cracked heat exchanger is a mild fall afternoon, not a −15°F night.
- Price before any work starts
- Furnaces, heat pumps, boilers & AC
- Every ZIP from 81001 to 81012
Here’s what a Pueblo tune-up should cover, and what you can handle yourself between visits.
Why fall — and why earlier than you think
ENERGY STAR recommends scheduling the heating check in the fall, before contractors get busy. Pueblo’s cold doesn’t always wait for November.
The coldest October temperature on record in Pueblo.
The earliest measurable snow in Pueblo’s records fell in early September 2020.
Pueblo’s normal year (NOAA 1991–2020) — a long season of furnace run time.
What a furnace tune-up should include
This follows ENERGY STAR’s maintenance checklist, plus two items that matter more at Pueblo’s altitude and snowfall.
Safety and combustion
- Inspect the burners and heat exchanger; a dirty burner or cracked heat exchanger makes a furnace less safe and less efficient
- Combustion safety test, including a check that exhaust isn’t back-drafting into the house
- Check gas connections for leaks and measure gas pressure
- Confirm the gas input matches the high-altitude table in the furnace’s manual (manufacturers make this the installer’s responsibility)
Ignition and controls
- Clean and test the flame sensor; check the igniter
- Test the safety controls: limit switch, pressure switch, rollout switch
- Check the thermostat’s settings and that it starts and stops the furnace properly
- Tighten electrical connections and measure motor voltage and current
Air and water
- Check the filter and airflow; lubricate moving parts where the blower needs it
- Inspect the condensate trap and drain on high-efficiency furnaces
- Check the vent pipes and outdoor openings: clear, secure, and at least 12 inches above the snow level you normally get (Trane)
Your part between visits
- Filter: check it monthly during heating season and change it at least every three months (ENERGY STAR).
- After snowstorms: look at the vent pipes outside and clear the openings.
- CO alarms: test them. Colorado law calls for one within 15 feet of every bedroom entrance in homes with fuel-burning appliances.
- Listen and sniff on the first cold night: a dusty smell that fades in a few hours is normal; a boom at startup or a burning-plastic smell isn’t. See noises and smells.
Questions we hear
How often should a furnace get a tune-up?
Once a year, before the heating season. ENERGY STAR recommends scheduling the heating check in the fall, since contractors get busy once winter arrives — and in Pueblo, the first hard cold can show up in October.
What’s different about a tune-up in Pueblo?
Two things. Altitude: at about 4,700 feet (around 5,000 in Pueblo West), the furnace’s gas input should match the high-altitude table in its manual, and any high-altitude parts should be in place. And snow: on high-efficiency furnaces, the plastic vent pipes outside should sit at least 12 inches above the snow you normally get, and the condensate drain needs to be clear so it can’t back up or freeze.
Can I do the tune-up myself?
You can — and should — handle the filter: check it monthly in heating season and change it at least every three months (ENERGY STAR). Combustion, gas pressure and safety-control checks need instruments and training, so leave those to a technician.
Do heat pumps and AC need a tune-up too?
Yes. ENERGY STAR suggests a cooling check in the spring. A heat pump works year-round in Pueblo — heating through winter, cooling through a summer that topped 90°F on 89 days in 2024 — so it benefits from both. See AC repair and heat pump repair.
Book your fall check. Call us.
We answer 24/7 for Pueblo and Pueblo West. A tune-up now beats a no-heat call during the next cold snap.
Where the Pueblo facts on this page come from
Checked against these public sources on November 3, 2026. Weather figures are National Weather Service records for Pueblo Memorial Airport.
- ENERGY STAR — maintenance checklist
- ENERGY STAR — how to keep your HVAC system working efficiently
- ENERGY STAR — guide to energy-efficient heating and cooling
- NWS Pueblo — 2019 annual summary (−6°F on Oct 30, 2019)
- NWS Pueblo — average first and last snowfall (earliest measurable snow, Sept 2020)
- NWS Pueblo — 2024 annual summary (89 days at 90°F or hotter)
- Trane — owner’s guide (vent openings 12 in above expected snow)
- ACHR News — high-altitude furnace setup
- Colorado Revised Statutes 38-45-102 (CO alarms)