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Furnace Repair in Pasadena, CA

The short answer

AllPro HVAC Services repairs gas furnaces in Pasadena homes, including ignition failures, short cycling, weak airflow, and odd noises or smells. We diagnose the cause and explain your options before any work begins. 24/7 emergency service is available.

Pasadena winters are mild by most standards, but cold nights still arrive, and a furnace that has sat idle since spring often shows its problems the first time someone turns up the thermostat. AllPro HVAC Services repairs gas furnaces in homes across Pasadena, about 7 miles northeast of our Los Angeles base. We find out why your system isn't heating, explain what we found in plain terms, and fix it so your home is warm and the equipment runs safely. If your heat goes out at night or on a weekend, we offer 24/7 emergency service.

Common Furnace Problems in Pasadena Homes

Los Angeles has a Mediterranean climate, so most Pasadena furnaces run only part of the year. Long idle stretches let dust settle on burners and sensors, and filters, belts, and igniters can fail quietly until the first cold evening. These are the problems we see most often:

  • Furnace won't turn on, or the blower runs but the air stays cold
  • Igniter or flame sensor failures that cause the burners to light and then shut off
  • Short cycling, where the furnace starts and stops every few minutes
  • Weak airflow from clogged filters, a failing blower motor, or leaky ductwork
  • Burning-dust smell on first startup that doesn't fade after a short run
  • Rattling, squealing, or banging from the cabinet or ducts
  • Thermostat problems that make the furnace ignore your settings

What Happens During a Repair Visit

We start by asking what you've noticed: when the problem started, what the furnace does, and any sounds or smells. Then we inspect the system, including the thermostat, filter, ignition sequence, flame sensor, burners, blower, limit switches, and venting. The goal is to find the actual cause, not just swap parts until something works.

Before any repair, we explain what's wrong and what it will take to fix it. If a part is worn but not yet failing, we tell you so you can plan ahead. Once the repair is done, we run the furnace through a full heating cycle to confirm it lights, heats, and shuts off as it should.

Furnaces in Older Pasadena Houses

Many Pasadena neighborhoods have older homes. In these houses, furnaces often sit in attics, crawlspaces, or tight closets, and ductwork may have been changed several times over the years. That affects both access and airflow. A furnace that seems underpowered is sometimes fine, and the real problem is a disconnected or undersized duct run. We check the ductwork you can reach along with the furnace so the fix addresses the actual problem.

Repair or Replace? What to Know Before Deciding

Most furnace problems can be repaired. When a system is aging, needs repeated major repairs, or has a cracked heat exchanger, replacement may make more sense. We'll give you an honest assessment either way.

If you're considering replacement, there are local rules to know. South Coast AQMD Rule 1111 limits nitrogen oxide emissions from gas furnaces sold and installed in the Los Angeles region, and the district has been amending the rule toward zero-emission requirements. The district sets and revises the compliance dates, so check the current rule before you plan a new gas furnace.

Some Pasadena homeowners look at heat pumps instead. Equipment rebates depend on which utility serves your address, so we confirm the current offer before we mention it in a quote. Also note that the federal Energy Efficient Home Improvement Credit (25C) only covered qualifying heat pumps placed in service before December 31, 2025. It isn't available for new installations after that date.

When a Furnace Problem Is an Emergency

Some problems shouldn't wait until morning. If you smell gas, leave the house and call your gas utility or 911 from outside. If a carbon monoxide alarm sounds, get everyone outside and call for help. Once the utility or fire department says it's safe to go back in, we can come out to diagnose and repair the furnace. We also respond around the clock when the heat fails on a cold night and someone at home is vulnerable to the cold.

Pasadena Neighborhoods and Nearby Areas We Serve

We repair furnaces throughout Pasadena, including ZIP codes 91101, 91103, 91104, 91105, 91106, 91107, and 91125. We also serve nearby San Marino, South Pasadena, San Gabriel, Alhambra, and Glendale.

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What to expect

How a visit goes

  1. Diagnosis before recommendations

    We find the cause of the problem first, then recommend a fix. You'll know what's wrong and why before we start any work.

  2. Straight talk on repair vs. replace

    Not every breakdown means a new system. We lay out the trade-offs so you can decide what fits your home and budget.

  3. Rebates checked for your address

    Rebate programs depend on which utility serves your home. We confirm the current offer for your address instead of assuming.

FAQ

Common questions

Don’t see your question? Call (213) 444-2507 and we’ll talk it through.

Why does my furnace smell like burning the first time I turn it on?

Dust settles on the burners and heat exchanger during the months the furnace sits unused, and it burns off at startup. The smell should fade within a short time. If it lingers, smells electrical, or comes back every time the furnace runs, have it inspected.

My furnace lights and then shuts off after a few seconds. What causes that?

A dirty or failing flame sensor is a common cause. The furnace can't confirm the flame is lit, so it shuts the gas off for safety. Restricted airflow and venting problems can cause similar behavior, which is why we check the whole ignition sequence.

Do you offer emergency furnace repair in Pasadena?

Yes. AllPro HVAC Services offers 24/7 emergency service. If you smell gas or your carbon monoxide alarm goes off, leave the home first and contact your gas utility or 911, then call us once it's safe.

Should I repair my old furnace or replace it?

It depends on the furnace's condition, the repair needed, and how often it has broken down. After we diagnose the problem, we explain both options. If you decide to replace it, check the current South Coast AQMD Rule 1111 requirements for gas furnaces first.

Are there rebates for replacing my furnace with a heat pump in Pasadena?

Rebate availability depends on the utility that serves your address, so we confirm the current offer before quoting it. The federal 25C tax credit doesn't apply to heat pumps installed after December 31, 2025.

How often should I change my furnace filter?

Check it at the start of the heating season and regularly while the furnace is in use. Replace it when it looks dirty. A clogged filter restricts airflow and can cause overheating and short cycling.

Need Heating or Cooling Help?

Whether your system needs a repair, a tune-up or a replacement, AllPro HVAC Services can take a look and explain your options. Emergency service is available 24/7.

(213) 444-2507
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