HVAC Guides
Furnace Safety Checks for Older Los Angeles Homes
Much of Los Angeles housing predates 1980, and many of those homes still heat with gas furnaces well past their 15-to-25-year design life. The primary risk in an aging furnace is a cracked heat exchanger, which can leak carbon monoxide into living spaces. An annual safety inspection before the heating season — plus working CO alarms — addresses that risk directly.
Cal Climate Corp has inspected and repaired gas furnaces in Burbank, Glendale, Pasadena, and across Los Angeles since 1968 under California license #265735.
Why do older LA homes need furnace safety checks?
Los Angeles winters are mild, so furnaces here run perhaps 30 to 60 nights a year — and that light duty cycle lets equipment survive far past its design life. A furnace installed in the 1990s can still light reliably today while its heat exchanger develops metal-fatigue cracks invisible from outside the cabinet. Because the furnace still “works,” the problem goes unnoticed without inspection. Older homes also commonly have aging gas connections and venting that predate current code.
What are the warning signs of an unsafe furnace?
Shut the system off and schedule an inspection if you notice any of these. None of them reliably self-resolve, and two — yellow flame and CO symptoms — indicate possible active carbon monoxide production.
| Warning sign | What it can indicate |
|---|---|
| Yellow or flickering burner flame | Incomplete combustion producing carbon monoxide |
| Soot streaks around the cabinet or vents | Combustion byproducts escaping the exchanger |
| Headaches or nausea when the heat runs | Carbon monoxide exposure — leave and call the gas company |
| Rotten-egg smell | Gas leak — leave the house, then call SoCalGas at 1-800-427-2200 |
| Frequent on-off cycling | Overheating, often from a failing component or airflow restriction |
| Rumbling or banging at startup | Delayed ignition stressing the heat exchanger |
What does a professional furnace safety check include?
A Cal Climate furnace safety check covers heat exchanger inspection, carbon monoxide testing, gas line and ventilation inspection, pilot light and ignition testing, and a full combustion safety review. The visit produces a written report — if a furnace is unsafe to run, you learn exactly why, and if it's fine, you have that documented for the season.
How often should an older furnace be inspected?
Annually, in early fall before the first cold evenings — every year without exception once a furnace passes 15 years old. Pair the inspection with carbon monoxide alarms on every level of the home (required by California law in homes with gas appliances) and replace the alarm units themselves every 5 to 7 years, since CO sensors degrade with age.
Frequently Asked Questions
Is a yellow burner flame dangerous?
It can be. A healthy gas burner flame is steady and blue. A yellow or flickering flame indicates incomplete combustion, which produces carbon monoxide. Causes range from dirty burners to inadequate air supply — all warrant turning the furnace off and scheduling an inspection before further use.
How long do gas furnaces last?
15 to 25 years for a maintained furnace. In Los Angeles, light winter use stretches lifespans — which means many homes are running furnaces well past 20 years old. Age alone isn't a safety problem, but heat exchangers in old furnaces must be inspected annually because metal fatigue and cracks develop with age regardless of run hours.
Do I need a CO detector if I have a newer furnace?
Yes. California law requires carbon monoxide alarms in all homes with gas appliances, regardless of equipment age. Install one on every level and near sleeping areas, and replace the units every 5-7 years — sensors degrade even when the battery is fine.
Schedule a Furnace Safety Check
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