The short answer
AllPro HVAC Services repairs gas furnaces in San Marino, CA, including ignition, airflow, blower, and safety-control problems, with 24/7 emergency service available. If your furnace is near the end of its life, we'll help you weigh repair against replacement, including local emissions rules and any heat pump rebates offered by your utility.
San Marino winters are mild, but cool nights still make a working furnace something you count on. Because many furnaces in the area sit unused for most of the year, problems often show up on the first cold evening. AllPro HVAC Services repairs gas furnaces for homeowners in San Marino (91108), about 7 miles east of our Los Angeles base. We find the actual cause, explain your options in plain terms, and fix what is broken without pushing work you don't need. If heat goes out late at night, we offer 24/7 emergency service.
Furnace Problems We Fix in San Marino Homes
Most furnace calls come down to a few causes. Some are simple, like a clogged filter or a thermostat setting. Others involve gas, ignition, or venting, and those need a trained technician. On every visit we test the whole system so we don't fix one part and miss the problem behind it.
- Furnace won't turn on, or the burners light and then shut off
- Igniter or flame sensor failure
- Blower runs but the air coming out is cool
- Short cycling, where the furnace turns on and off every few minutes
- Banging, squealing, or rumbling noises from the cabinet or ducts
- Weak airflow at some or all vents
- Tripped limit switches or a pressure switch error
- Thermostat problems or wiring faults
Why Furnaces Act Up in a Mild Climate
Los Angeles has a Mediterranean climate, with dry summers and mild winters. Inland areas like the San Gabriel Valley get hotter summers than the coast, and your air conditioner does most of the work for much of the year. That means a furnace can sit idle for months while dust settles on the burners and flame sensor, and small parts wear out without anyone noticing.
When you finally switch the heat on, that buildup can cause a burning smell, a failed ignition, or a safety shutdown. A quick check before the cool season lets you catch these issues on your own schedule, not on the coldest night of the year.
What Happens During a Repair Visit
We start by asking what you've noticed: sounds, smells, error codes, and when the problem began. Then we inspect the thermostat, filter, ignition system, burners, flame sensor, blower, and safety controls. We also check the venting so combustion gases leave the house the way they should.
Once we find the cause, we explain it and tell you what the repair involves before we start. Many common parts can be replaced on the first visit. If a part has to be ordered, we tell you so and make sure the system is left in a safe condition in the meantime.
Repair or Replace? What San Marino Homeowners Should Know
A repair is usually the right call when the furnace is in good shape overall and the problem is a single failed part. Replacement makes more sense when a major component like the heat exchanger has failed, or when an older unit keeps needing repairs.
If you're thinking about a new gas furnace, check the rules first. South Coast AQMD Rule 1111 limits NOx emissions from natural-gas central furnaces sold and installed in the Los Angeles region. The district has been amending the rule toward zero-emission requirements and sets and revises the compliance dates, so it's worth checking the current version before you choose equipment.
Some homeowners decide to switch to a heat pump instead. Rebates depend on which utility serves your address. LADWP customers can apply for Consumer Rebate Program rebates on qualifying heat pump systems after installation, within 12 months of purchase. Many homes outside the City of Los Angeles are served by Southern California Edison instead, so we confirm the current offer for your address before quoting it. The federal 25C tax credit for heat pumps applied only to systems placed in service before December 31, 2025, and is not available for new installations after that date.
When to Call Right Away
Some furnace problems shouldn't wait. If you smell gas, leave the house and call your gas utility or 911 from outside. Call us after that for the repair. If your carbon monoxide alarm goes off, get everyone outside first.
For heat loss on a cold night, a furnace that keeps tripping its safety controls, or burning or electrical smells, our 24/7 emergency service can get a technician to your San Marino home.
More services in San Marino
- AC Repair in San Marino
- Heating Repair in San Marino
- Heat Pump Installation in San Marino
- AC Installation in San Marino