Furnace & heating
AC repair
Ductless mini splits
TraneSeasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
Get your free estimateFast, Reliable Furnace Repair Across Duarte
Furnace repair in Duarte typically costs $150 – $700, and most jobs are completed the same day or next. If your heat is out on a cold foothill morning, call (626) 657-5344 and we’ll have a background-checked technician at your door inside the promised window. We know Duarte’s older homes, their original ductwork, and exactly what fails when the first real cold snap hits. The price goes in writing before any work starts, and every repair is guaranteed for a full year.
Why Dalton Heating & Air Pasadena Is Duarte’s Preferred Furnace Repair Company
We’ve worked on enough Duarte furnaces to know what we’re walking into before we arrive. A 1958 ranch on Royal Oaks Drive with original galvanized ducts is a different job than a 1970s split-level off Huntington Drive. Our techs carry parts for Carrier, Trane, Lennox, and Goodman furnaces, so most repairs are completed on the first visit without ordering and rescheduling.
Our Furnace Repair team operates under The Garrison Standard, which has governed every job since 2003. That means a written price before any work begins, a written guarantee on every repair, and a free return visit if the repair fails within the year. No exceptions. Duarte homeowners call us because the terms are exact, not vague promises.
Live phone support is staffed by a real person 24 hours a day, 7 days a week. When your furnace quits at 6:40 a.m. and the house is 54 degrees, you get a human on the line, not a voicemail queue promising a callback window. Marco Benitez and our Duarte crew run on The Garrison Code: arrive inside the stated window, price in writing before starting, do the job by the book, leave the site clean, and stand behind the work for a full year.
Styles & brands we work with
Furnace Maintenance in Duarte
Furnace maintenance in Duarte runs $80 – $200 and is the single best thing you can do before winter hits. Duarte’s warm days and cool nights mean furnaces sit idle for months, then get asked to work hard the week temperatures drop into the 40s. Dust, rust, and a clogged burner from months of disuse are the most common things we find.
What a Duarte Tune-Up Covers
We inspect the heat exchanger for cracks, test the ignitor and flame sensor, check the gas valve for proper operation, and clean the burner assembly. Static pressure gets measured so we can tell you whether your ducts are strangling the system. Every check is written down and given to you when we’re done, so you know exactly what was tested and what the readings showed.
When to Schedule in Duarte
Book maintenance before Santa Ana season, not during it. October is ideal, though November still beats waiting for the first cold snap. A furnace that has not been serviced in years is the one that fails on the coldest night of the year, and Duarte gets a handful of those every winter.
Heat Pump Repair in Duarte
Heat pump repair in Duarte runs $150 – $650, depending on whether the issue is electrical, refrigerant, or compressor related. Many Duarte homes added heat pumps during the 1980s and 90s as a supplement to aging furnaces, and those units are now reaching the end of their service life. When a heat pump fails in heater mode, the furnace is often the only backup, which means two systems need attention at once.
Common Heat Pump Failures We See
Reversing valve failures are common on older Duarte heat pumps, especially after repeated temperature swings between heating and cooling seasons. A stuck valve means the unit runs but won’t switch into heat mode, leaving you with cold air from the vents. In hillside neighborhoods like Las Lomas, accumulated dust from dry foothill conditions clogs coils and drives up head pressure until the compressor trips.
What Heat Pump Repair Costs in Duarte
A capacitor replacement might be $150. A reversing valve job can hit $600 with labor. We’ll give you the exact number in writing after diagnosis, before any work starts, and explain what failed and why. If the repair doesn’t hold, we come back at no charge for a full year.
Trusted Brands We Service in Duarte
Our technicians are factory-trained on Carrier, Trane, Lennox, and Goodman equipment, which covers the majority of furnaces installed in Duarte homes built in the 1950s and 60s. We stock common ignitors, flame sensors, pressure switches, and control boards locally so Duarte customers aren’t waiting on parts shipped from out of state. Whether your furnace is a Lennox from the Clinton administration or a Carrier installed five years ago, we carry the parts or can source them fast.
See the difference
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After
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After
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AfterCommon Furnace Repair Problems We See in Duarte Homes
- Short cycling from high static pressure. Original 1950s-60s ductwork is undersized for modern blower motors. The high-limit switch trips, the furnace shuts down, and the house never reaches the thermostat setpoint.
- Rusted galvanized ductwork leaking heated air. Duarte’s foothill moisture accelerates corrosion in crawlspaces, especially in Las Lomas and the northern hillside streets. Rooms stay cold while the gas bill climbs.
- Breaker trips from original electrical panels. A 1960s panel often can’t handle the startup load of a high-efficiency furnace. The system draws, the breaker trips, and you wake up to a cold house.
- Ignitor and flame sensor failures from dust. Duarte’s dry, dusty conditions coat these components during the off-season. The furnace tries to start, fails to ignite, and locks out.
Pricing for Furnace Repair in Duarte, CA
Most furnace repairs in Duarte fall between $150 and $700, depending on the part and the system age. Here’s how that breaks down:
| Service | Typical Price Range |
|---|---|
| Furnace Repair | $150 – $700 |
| Furnace Maintenance (Tune-Up) | $80 – $200 |
A flame sensor or ignitor replacement sits near the bottom of that range. A heat exchanger or gas valve replacement climbs toward the top. You’ll know the exact number before we touch a screwdriver, and the written quote is the price you pay. Call (626) 657-5344 for a free estimate.
We Also Serve Cities Near Duarte
Our crews serve Furnace Repair in Duarte and the surrounding foothill communities, including Monrovia, Arcadia, Sierra Madre, and Temple City. If you’re just outside Duarte and looking for the same written pricing and one-year guarantee, give us a call and we’ll get a technician to you on the same schedule.
Serving Duarte, CA - Our Local Coverage Area
We’re based in the Duarte area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Furnace Repair in Duarte
The thermostat isn’t the problem. Original undersized ductwork creates high static pressure, which trips the high-limit switch and shuts the furnace down before the house reaches temperature. We measure static pressure on every Duarte call, and homes with original 1950s-60s galvanized ducts often read 0.8 to 0.9 inches of water column, well above the 0.5 maximum that modern furnaces are designed for. The fix is usually sealing or resizing ducts, not another thermostat swap. Call (626) 657-5344 and we’ll diagnose the actual airflow problem.
Sometimes, but not always. If the rust is limited to a few joints or a short run, we can seal those sections and restore much of the lost airflow without a full duct replacement. If the corrosion is widespread and the duct is leaking 30 percent or more of heated air into the crawlspace, repairing only the furnace will leave cold rooms and high gas bills. We’ll test the system, show you the leakage numbers, and give you a written price for the minimal repair that will actually work. Call (626) 657-5344 and we’ll tell you what your ducts need.
Often yes. Many Duarte homes built in the 1950s and 60s have original 100-amp or smaller panels that cannot handle the startup load of a modern high-efficiency furnace with an ECM blower motor. If your panel is original and you’re replacing a furnace, plan on a panel evaluation before installation. We’ll check the load during diagnosis and tell you whether an electrician needs to be involved before any furnace work proceeds. Call (626) 657-5344 for an honest assessment.
High-limit trips from undersized ducts, followed closely by corroded duct leaks in hillside crawlspaces. In one Las Lomas home, our tech found a 1960s Carrier furnace with a cracked heat exchanger and a corroded galvanized duct run leaking 40 percent of heated air into the crawlspace. We sealed the ducts and replaced the heat exchanger, dropping static pressure from 0.9 to 0.5 inches. The homeowner’s gas bill dropped within a month. That’s the pattern: the furnace gets blamed when the real problem is the ductwork it’s attached to. Call (626) 657-5344 and we’ll find the actual failure.
Hillside homes in the northern and Las Lomas areas cost more to work on than flat tract homes, mostly because of access. Crawlspaces are tighter, equipment is often harder to reach, and the moisture that drives duct corrosion is more aggressive on sloped lots. A repair that is straightforward on a level Duarte street might require additional duct sealing or pan replacement on a hillside. You’ll get the exact price in writing before work starts, hillside or not. Call (626) 657-5344 for a free estimate tailored to your home.
Written by Marco Benitez, Owner at Dalton Heating & Air Pasadena, serving Duarte and the surrounding foothill communities with furnace repair, maintenance, and heat pump service under The Garrison Standard since 2003.
If your furnace is down in Duarte, don’t wait through another cold night. Call (626) 657-5344 now. We answer live, 24/7, and we’ll get a technician to your home with a written price and a full-year repair guarantee.