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 Monrovia
Furnace repair in Monrovia typically costs $150 – $700, and most repairs are completed the same day. If your heat is out on a cold winter night in a hillside home near Cloverleaf Canyon, you want a crew that knows Monrovia’s specific housing stock and gets the job done right the first time. We’ve been repairing furnaces in Monrovia’s older Craftsman homes, Spanish-style bungalows, and newer foothill developments for years. Call (626) 657-5344 for a free estimate, and we’ll get a technician to your Monrovia home quickly.
Why Dalton Heating & Air Pasadena Is Monrovia’s Preferred Furnace Repair Company
Monrovia homeowners call us because we put the price in writing before any work starts, every single time. That’s The Garrison Standard, the code we’ve operated under since 2003 as a Garrison Partners company. If you’ve been burned by a technician who quoted one price over the phone and a different one at the door, this matters. We show up inside the stated window, our techs are background-checked and uniformed, and we explain the repair in plain language before touching your system. Then we hand you a written guarantee on the repair, good for a full year. If it fails in that time, we return at no charge. No fine print.
Marco Benitez, who leads our team, holds every technician to The Garrison Code: arrive on time, price in writing before starting, do the job by the book, leave the site clean, and stand behind the work for 365 days. That’s the Done Right Promise, and it applies to every furnace call we run in Monrovia, from a quick ignitor swap to a full heat exchanger replacement.
Styles & brands we work with
Furnace Tune Up in Monrovia
Furnace Tune Up in Monrovia is the single best thing you can do to avoid a no-heat call in January, and it’s also the most overlooked service we offer. A tune-up runs $80 – $200, takes about an hour, and catches the problems that turn into $700 repairs later: a cracked ignitor, a blower motor pulling high amps, a gas valve starting to stick. In Monrovia’s dry, dusty foothill air, furnaces collect fine grit that settles on burners and blower wheels, which cuts airflow and drives up your gas bill. Our Furnace Repair team runs a full checklist on every tune-up and hands you a written report of what we found.
What We Check
We inspect the heat exchanger for cracks, test the ignitor and flame sensor, check gas pressure, measure static pressure, and clean the blower assembly. If the airflow is off in a tight mechanical closet north of Foothill, we’ll tell you and show you the numbers before recommending any fix.
When to Schedule
Best time is October, before the first cold snap. Monrovia winter nights occasionally dip near freezing, and the last thing you want is to discover a dead ignitor when you need heat at 2 a.m. Book early and you’ll skip the winter rush.
Emergency Furnace Repair in Monrovia
Emergency Furnace Repair in Monrovia means no heat on the coldest night of the year and a home that won’t warm up. We take those calls seriously. Our phones are answered by a live person 24/7, not a voicemail queue, and we dispatch technicians to Monrovia fast, including after hours. Emergency furnace repair runs the same $150 – $700 range as standard repairs, and there’s no overtime surcharge for nights or weekends. When a family in a hillside home off Norumbega Drive calls at midnight with a dead gas valve, we get there.
What Counts as an Emergency
No heat, a furnace that won’t stay lit, a burning smell, or a carbon monoxide alarm going off. If you smell gas, leave the house and call the utility first, then call us. For everything else, call (626) 657-5344 and we’ll talk you through a quick safety check before the tech arrives.
Overnight Repairs
We stock common parts on the truck: ignitors, flame sensors, gas valves, blower motors, control boards. That means most Monrovia emergency calls get fixed in one visit, not two. If a part has to be ordered, we’ll tell you that upfront and give you a straight answer on timing.
Trusted Brands We Service in Monrovia
Our technicians are factory-trained on Carrier, Trane, Lennox, and Goodman furnaces, along with five other major residential brands. We carry common parts for these systems on our trucks, so a Carrier gas valve or a Goodman ignitor doesn’t mean a three-day wait. Monrovia’s mix of older homes and newer foothill builds means we see everything from 30-year-old Lennox units to recent Goodman installs. We know how each brand’s control board acts up and which parts fail first in Monrovia’s dusty, dry air.
See the difference
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AfterCommon Furnace Repair Problems We See in Monrovia Homes
- Blower motors overheating in tight mechanical closets. Hillside homes north of Foothill Boulevard often have mechanical closets so cramped that heat builds up around the blower assembly. Static pressure rises, the motor pulls more amps, and it burns out early unless we size the duct transitions correctly.
- Heat exchangers cracking in older gravity furnace retrofits. In Monrovia’s Historic District, we regularly find original gravity furnaces that were retrofitted with oversized burners. The extra heat stresses the old exchanger until it cracks, which is a safety issue that needs a professional diagnosis and replacement.
- Zone dampers that were never balanced. Multi-zone systems in larger foothill homes fail when dampers aren’t adjusted after installation. Rooms over the garage stay cold while upstairs bedrooms overheat, and the furnace runs constantly trying to satisfy a thermostat that never reaches setpoint.
- Ignitors failing from dust buildup. Monrovia’s dry, dusty air, especially during Santa Ana wind events, coats the ignitor and flame sensor in fine grit. That’s the most common cause of a furnace that clicks but won’t light.
Pricing for Furnace Repair in Monrovia, CA
Most furnace repairs in Monrovia run $150 – $700 depending on the part and the labor involved. A simple ignitor replacement is usually under $200. A blower motor runs more. A heat exchanger replacement is at the top of that range. Tune-ups run $80 – $200. Here’s the breakdown:
| Service | Typical Cost in Monrovia |
|---|---|
| Furnace Repair | $150 – $700 |
| Furnace Tune Up | $80 – $200 |
| Emergency Furnace Repair | $150 – $700 |
The price you’re quoted is the price you pay. It’s in writing before the work starts, and the repair is guaranteed for a full year. If it fails in that time, we come back free. Call (626) 657-5344 for a free estimate on your specific system.
We Also Serve Cities Near Monrovia
Our crews cover Furnace Repair in Monrovia and the surrounding foothill communities. We run calls to Arcadia, Duarte, Sierra Madre, and Temple City regularly, so we’re familiar with the housing stock and climate challenges across this part of the San Gabriel Valley. If you’re in a neighboring city, the same written pricing, guaranteed repairs, and 24/7 live dispatch apply.
Serving Monrovia, CA - Our Local Coverage Area
We’re based in the Monrovia 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 Monrovia
The most common cause is unbalanced zone dampers or undersized duct transitions, especially in hillside homes where mechanical closets are tight and airflow was never properly measured. Rooms over a garage or on the far end of the duct run get starved for air, so the furnace runs longer trying to satisfy the thermostat. We start by measuring static pressure and checking damper positions, then make the fix, not guess at it. Call (626) 657-5344 for a diagnostic visit.
Yes, and we’ve done it more than once in the Historic District. The key is custom-fabricated sheet-metal transitions, not off-the-shelf fittings. We abate the old asbestos-wrapped ducting, size a compact high-efficiency unit that fits the existing mechanical space, and route new ductwork through existing chases so the home’s original layout stays intact. The end result is modern heat and original character, with the work guaranteed in writing for a year.
Once a year, every year, ideally in October before the first cold night. Monrovia’s air is dry and carries fine dust from the San Gabriel Mountains and Santa Ana winds, and that grit builds up on burners, blower wheels, and flame sensors faster than in coastal cities. Annual tune-ups run $80 – $200 and catch failing ignitors, dirty sensors, and weak blower motors before they become $700 emergency repairs.
A furnace that won’t light, almost always from a failed ignitor or a dirty flame sensor. In older Monrovia homes with gravity furnaces or retrofitted wall heaters, we also see cracked heat exchangers when oversized burners were installed years ago. Both are repairable, but the heat exchanger is a safety issue, so we check it first on every older system. Same-day service is usually possible, and calls are answered live 24/7.
Short cycling on windy nights often points to a furnace that’s oversized for the home’s actual heating load, which is common in Monrovia’s older houses where insulation was never upgraded. The unit hits the thermostat setpoint too fast, shuts down, then restarts minutes later. A load calculation based on the real insulation, window type, and duct leakage tells us whether the furnace needs to be adjusted, not replaced. Call (626) 657-5344 and we’ll measure it properly.
Written by Marco Benitez, Owner at Dalton Heating & Air Pasadena, serving Monrovia since 2003.