Furnace Repair
Furnace Repair jacksonville FL You Can Count On Tonight
When your heat quits in the middle of a Jacksonville cold snap, you need furnace repair jacksonville FL that shows up fast and fixes it right. We handle gas furnace repair jacksonville, heat pump heating, and emergency furnace repair jacksonville FL across Duval County, seven days a week. Our techs carry the parts to get your system running the same visit.
Service overview
What Furnace Repair jacksonville FL Actually Involves
Furnace repair jacksonville FL is the diagnostic and mechanical work that restores heat to a failed or underperforming furnace, and it covers everything from a dirty flame sensor to a failed inducer motor. We pull the burner assembly, test the ignition sequence with a multimeter, check the gas valve, and verify the heat exchanger for cracks before we ever call the job done. Most no-heat calls trace back to four things: ignition failure, a failed capacitor, a clogged condensate drain, or a thermostat that lost its calibration.
Jacksonville winters are short but sharp. A 30-degree night in Mandarin or Orange Park hits different when your furnace has been sitting idle since March. We see ignition failure most often on the first cold snap of the season, because dust and humidity have been settling on the burners for eight months. If your furnace is blowing cold air in jacksonville, don't wait it out. One diagnostic visit tells you whether it's a $180 sensor or a $1,400 heat exchanger, and we quote both before we touch a wrench.
Practical benefits
Why Jacksonville Homeowners Call Us First
A furnace that won't light is a comfort problem and a safety problem. Here's what you get when you book furnace repair jacksonville FL with our crew.
Same-Day Heat Restored
We book same day furnace repair jacksonville whenever the schedule allows, and we keep common parts on the truck: igniters, flame sensors, capacitors, contactors, and universal control boards. That means most no-heat calls end with warm air moving through the house the same afternoon, not three days later.
Gas and Electric Covered
Our techs are trained on gas furnace repair jacksonville and electric forced-air systems alike, plus Carrier, Trane, Lennox, Goodman, Rheem, and York equipment. We test gas pressure with manifold gauges, verify flame rectification, and confirm the unit is pulling the right amp draw before we sign off.
Straight Pricing, No Surprises
You get the diagnostic fee, the repair range, and the parts cost before we start. Affordable furnace repair jacksonville FL doesn't mean cheap parts; it means you know the number going in. Typical 2026 repairs in this area run $180 to $650 for common ignition and blower fixes.
Code-Correct, Permitted Work
Any gas-side repair we make follows Florida mechanical code and gets documented for your records. We hold a Florida HVAC contractor license, carry EPA Section 608 certification for refrigerant handling, and pull permits when a repair crosses into replacement territory. That protects you at resale and at insurance time.
How service works
How Our Furnace Repair Process Works
Five steps, start to finish. You'll know what's happening and what it costs before we open a panel.
STEP 01
Call and Triage
You call (312) 638-0812 and describe what the furnace is doing: no heat, short cycling, a smell, a noise. We ask the model and age, then book a window. Emergency furnace repair jacksonville FL calls get routed to the next available tech, including nights and weekends.
Tools and methods
Tools and Methods We Use
Multimeter and Clamp Meter
Reading voltage and amp draw at the igniter, gas valve, inducer, and blower. Amp draw tells us whether a motor is failing long before it stops.
Manifold Gauges
Checking gas manifold pressure against the data plate. Wrong pressure causes delayed ignition, sooting, and short-lived igniters.
Leak Detector
Sniffing gas connections and the heat exchanger for leaks. A combustible gas detector finds what soap bubbles miss.
Inspection Camera
Looking inside the heat exchanger and flue for cracks, corrosion, and blockages without pulling the whole unit apart.
Anemometer and Duct Blaster
Measuring airflow at registers and duct leakage across the system. Airflow problems masquerade as furnace problems more often than people think.
Vacuum Pump and Recovery Machine
For heat pump and dual-fuel systems: recovering refrigerant, pulling a deep vacuum, and recharging with R-410A or R-32 after a repair.
Sequence-of-Operation Testing
We test the furnace in the order it actually runs: thermostat call, inducer, igniter, gas valve, flame sense, blower. The first stage that fails is the problem, and every stage gets a reading to prove it.
ACCA Manual J and Manual D
When a repair turns into a replacement or a duct fix, we size equipment and ductwork with Manual J load calculations and Manual D duct design. It's how you avoid an oversized furnace that short cycles.
Combustion Analysis
We measure carbon monoxide and flue draft after any gas-side repair. If the numbers don't match the manufacturer spec, the job isn't finished.
EPA Section 608 Refrigerant Handling
On heat pump and dual-fuel systems, refrigerant is recovered, recycled, and recharged to weight, not to gauge pressure. It's the law and it's how the charge stays correct.
Where this service fits
When to Call for Furnace Repair
First cold snap of the season and the furnace hasn't run since March.
We run a full startup: clean the burners, test the igniter and flame sensor, check the flue, and verify temperature rise. Dust and humidity settle on components all summer, which is why the first cold night is our busiest. You get heat that first night and a heads-up on any part that's close to failing, so the next cold front isn't a surprise.
You smell gas near the furnace or the carbon monoxide alarm chirps.
We treat it as an emergency. Shut the gas off at the appliance, ventilate, and call us. Our tech checks the gas valve, burner manifold, and heat exchanger with a leak detector and combustion analyzer. Either the leak is found and repaired, or the furnace is red-tagged as unsafe and you get a replacement plan the same day.
Your furnace is 18 years old and this is the third repair in two winters.
We diagnose the current failure and price both the repair and a replacement. When a heat exchanger is cracked or a control board is obsolete, replacement is the honest recommendation, and we size the new unit with a Manual J calculation. You stop paying for repeat repairs and get a furnace matched to your home and ductwork, installed with a permit and warrantied.
You're selling the house and the buyer's inspector flagged the furnace.
We inspect, document the findings, and repair what's actually wrong. You get a written service record showing the ignition test, temperature rise, and combustion readings for the buyer's file. The inspection objection gets cleared without a price renegotiation, and the closing stays on schedule.
Local execution
How Furnace Repair Runs in Jacksonville
Jacksonville heating is a different animal than what you'd see in Atlanta or Charlotte. Our winters are mild enough that heat pumps carry most of the load, but we still get hard freezes that push gas furnaces to their limit. That on-again, off-again pattern is exactly why ignition failure repair jacksonville calls spike on the first cold night: components sit unused for eight months, then get asked to fire on demand. Older homes in Riverside, Springfield, and Murray Hill often have original ductwork with disconnected flex runs and undersized returns, so a furnace that tests fine on the bench still underperforms in the house. We check static pressure and duct leakage on every no-heat call for that reason. Newer construction out in Nocatee and Bartram Park is tighter, which means combustion air and venting get more attention. Florida mechanical code and Duval County permitting apply to gas-side work, and we pull permits when a repair crosses into replacement. If you're searching furnace repair jacksonville FL 24/7 on a 35-degree night, we're dispatching techs across the county with parts on board.
Riverside and Avondale
1920s homes with original duct chases and gravity-era layouts. Airflow is usually the hidden problem behind a furnace that won't keep up.
Mandarin and Julington Creek
A mix of 1980s and 2000s construction. We see a lot of original Bryant and Rheem furnaces reaching end of life here.
Nocatee and Bartram Park
Tight new construction with high-efficiency Carrier and Trane systems. Combustion air and venting get extra attention on these calls.
Orange Park and Fleming Island
Larger lots, longer duct runs, and more dual-fuel and heat pump systems. Defrost and refrigerant issues show up alongside furnace calls.
Jacksonville Beach and Atlantic Beach
Salt air corrodes burner assemblies, screws, and electrical connections faster than inland. We inspect for corrosion on every beachside call.
Short, sharp winters with hard freezes
Furnaces sit idle for months, then get pushed hard for a week. Igniters and flame sensors fail at the worst moment, which is why fall maintenance pays for itself.
High humidity most of the year
Humidity corrodes electrical connections and promotes rust in burner compartments. We check contactors, terminals, and the burner box for corrosion on every visit.
Older housing stock with aging ductwork
Leaky and disconnected ducts cut heating performance. We measure static pressure and duct leakage so a repaired furnace actually delivers heat to the rooms.
Coastal salt air near the Beaches
Salt accelerates corrosion on burner assemblies and electrical parts. Beachside furnaces need inspection more often than inland units.
Problems we solve
Furnace Problems We Fix in Jacksonville
Most no-heat calls fall into a handful of categories. Here's what we see most and how we handle each one.
Furnace won't ignite on a cold morning
We test the igniter for resistance, clean or replace the flame sensor, and verify the gas valve opens on call. Most ignition failure repair jacksonville calls are done in under two hours with parts we carry on the truck. You wake up to a 55-degree house and a system that clicks but never lights. Left alone, a failed igniter or dirty flame sensor keeps the gas valve shut and the blower blowing cold air.
Furnace short cycles and never satisfies the thermostat
We check filter condition, static pressure, and temperature rise. If the high-limit is tripping, we find out why: restricted airflow, a failing blower motor, or a misapplied furnace. Then we correct the cause, not just the symptom. Short cycling wears out the igniter, inducer, and control board faster and leaves rooms cold. It usually points to a dirty filter, an oversized furnace, or a high-limit switch tripping.
Furnace blows cold air in heating mode
We confirm thermostat mode, watch the full ignition cycle, and test flame rectification. On heat pumps we check the reversing valve and defrost board. You get a straight answer on which system is actually at fault. A furnace running but not heating is often a thermostat set to fan-on, a heat pump stuck in defrost, or a burner that lights and drops out on flame sense. It wastes gas and never warms the house.
Rattling, booming, or screeching from the furnace
We isolate the noise source, inspect the blower and inducer, and check gas pressure with manifold gauges. Delayed ignition gets corrected at the burner, and worn bearings get replaced before they seize. Noise means a mechanical problem: a loose blower wheel, a failing inducer bearing, or delayed ignition causing a small boom. Ignoring it turns a $250 repair into a $900 one.
A practical standard for every visit.
Clear planningPrepared arrivalsCareful workLocal follow-through
Experience in the details
Eight Years of Duval County Furnace Work
AirCrest Jacksonville HVAC has been repairing furnaces in Jacksonville since 2018. In eight years we've worked on everything from 1980s Bryant standing-pilot units in Springfield to modern modulating Carrier and Trane systems in Nocatee. Our techs hold NATE certification and EPA Section 608 credentials, and we size and verify airflow using ACCA Manual J and Manual D principles so a repair doesn't create a new problem downstream. We stock R-410A and R-32 refrigerant, copper line sets, and universal ignition components on every truck.
- NATE-certified technicians on every residential heating call
- EPA Section 608 certified for refrigerant recovery and handling
- Florida HVAC contractor license, bonded and insured
- 8 years serving Duval County, St. Johns, and Clay County homes
- Full parts inventory: igniters, flame sensors, capacitors, control boards
Where we work
One local team. A lot of ground covered.
Downtown JacksonvilleRiversideAvondaleSan MarcoSpringfieldOrtegaMandarinSouthsideArlingtonNorthsideWestsideBeaches
Check my address Notes from local customers
What Jacksonville Customers Say
Our furnace quit on the first cold night in November. I called at 9 p.m. and a tech was at the house before midnight. Turned out to be a failed igniter and a flame sensor that was filthy. He had both on the truck, showed me the readings, and had heat running in about an hour. Price was exactly what he quoted.
I'd had two other companies tell me I needed a whole new furnace. AirCrest tested the sequence, found a bad control board, and replaced it for a fraction of the replacement quote. That was two winters ago and it's still running. Honest diagnosis is worth more than a cheap service call.
Our 1920s house has weird ductwork and the back bedrooms never got warm. They repaired the furnace, then sealed two disconnected flex runs in the attic. Temperature rise went from 28 degrees to 45. Same furnace, way better heat. Should have called them years ago.
Most furnace repairs in Jacksonville run $180 to $650 in 2026, with a diagnostic fee of $79 to $129 that we credit toward the repair. Igniter and flame sensor replacements sit at the low end. Blower motors, control boards, and inducer assemblies push toward $500 to $1,200. Heat exchanger failures usually mean replacement, not repair.
AirCrest Jacksonville HVAC repairs gas and electric furnaces across Duval County, including Mandarin, Riverside, Arlington, and the Beaches. We're a Florida-licensed HVAC contractor with NATE-certified techs, and we work on Carrier, Trane, Lennox, Goodman, Rheem, York, and Bryant equipment. Call (312) 638-0812 and we'll book a same-day diagnostic.
A furnace blowing cold air usually means the burner never lit: a failed igniter, a dirty flame sensor, a closed gas valve, or a thermostat stuck in fan-on mode. In heat pump systems it can be a defrost cycle or a reversing valve issue. We test the ignition sequence and refrigerant charge to find out which one you have.
Same-day service is typical for calls booked before early afternoon, and emergency furnace repair jacksonville FL runs 24/7 with a two-to-four-hour arrival window on most nights. If the fix needs a part we don't stock, we'll tell you the ETA up front and set you up with safe temporary heat where possible.
Keep exploring
Other Heating and Cooling Services We Handle
Your next step is waiting
Get Your Furnace Repair jacksonville FL Booked Today
No heat tonight? Call (312) 638-0812 and we'll dispatch a licensed tech with the parts to fix it. Upfront pricing, warrantied work, and a real arrival window. We've been keeping Duval County warm since 2018.
Start with the basics
call AirCrest Jacksonville HVAC
Call (312) 638-0812 and a live person answers, not a phone tree. We book same-day appointments across Jacksonville and Duval County, and our after-hours line stays open for emergencies. Tell us what the system is doing and we will load the right parts before the truck rolls.