WHAT YOU CAN EXPECT TO PAY
In Chicago homes, water under the furnace is usually one of the cheaper problems to correct. The fix is normally a drain line, a pump, or a pan.
Most furnace repairs run $150 to $600 in 2026, and leak jobs land at the lower end. Frontline Heating & Cooling gives you the price upfront before any work begins.
Chicago furnace leak repair costs at a glance
- In 2026, furnace repair in Chicago generally costs $150 to $600, and the average furnace repair bill lands close to $300.
- The most common cause of a leak is a clogged condensate drain line, and Frontline clears one for $149
- HVAC labor in Chicago runs $75 to $150 per hour, and Frontline’s diagnostic visit is $89, which is applied to the repair work.
- The priciest furnace repair is a cracked heat exchanger. Replacing a heat exchanger costs $1,000 to $3,500, and on a high efficiency furnace the first sign is often water on the floor.
- Furnace installation in Chicago costs $3,500 to $7,500, and the $5,000 rule helps decide when repairing no longer makes sense.
- Frontline Heating & Cooling has been family owned since 2020, employs EPA and NATE certified HVAC technicians, and has more than 150+ five star reviews across the Chicago area, including Oak Lawn and Orland Park.
How much does it cost to repair a leaking furnace in Chicago?
For a furnace that is leaking water in the Chicago metro area in 2026, plan on paying $149 to $395. Most leak calls are resolved in a single visit.
What determines the price is the component of the heating system causing the water, not how large the puddle is.
If the problem is caught early, the damage usually stays limited to a mop instead of a floor.
At Frontline Heating & Cooling, leak repairs are priced as installed jobs. The figure in the table is the amount on the invoice, including the part, labor, and test cycle.
| Leak repair | What is making the water | Season | What the price includes | Chicago price, 2026 |
|---|---|---|---|---|
| Diagnostic visit | Any water at the base of the furnace | Any | Tracing the water to its source, a float switch test, and a written price | $89 |
| Condensate drain line clearing | Algae clog in the AC drain line | June to September | Pressurized flush, trap cleaning, and a treatment tablet | $149 |
| Condensate pump replacement | Pump beside the furnace failed | Any | New pump, new tubing, and a float switch test | $349 |
| Drain pan replacement | Rusted or cracked pan under the AC coil | June to September | New pan, slope check, and drain line reconnection | $395 |
| Evaporator coil cleaning | Frozen coil thawing onto the floor | June to September | Coil cleaning, airflow check, and refrigerant charge check | $299 |
| Humidifier solenoid or pad | Whole house humidifier dripping | November to March | Solenoid valve or pad frame, and a quarter inch line inspection | $79 to $189 |
| Condensate trap service | Clogged trap on a high efficiency furnace | November to March | Trap cleaning, new drain hose, and a neutralizer check | $129 |
| Secondary heat exchanger | Cracked exchanger on a high efficiency furnace | November to March | Exchanger, gaskets, and a combustion safety test | $1,000 to $3,500 |
Seven of the eight repairs come in under a blower motor. The one exception is a cracked secondary heat exchanger, which is the leak repair that turns into a replacement discussion.
If the same leak returns within 90 days, every price includes a return visit.
What affects furnace repair cost in Chicago?
Four factors drive a furnace repair bill in Chicago: the part, the labor rate, the time of day you call, and the furnace’s age.
Chicago HVAC labor runs $75 to $150 an hour. The service call fee is the flat charge for diagnosis and written cost estimates.
At Frontline Heating & Cooling, the service call costs $89, and we apply that amount to the repair when you approve the work immediately.
The part is the biggest variable. An ignitor runs $150 to $300 installed. A blower motor is $400 to $700. A heat exchanger costs $1,000 to $3,500, and a cracked exchanger changes the entire conversation.
Timing matters as well. If you call early on a weekday, someone from the crew can usually reach your home that afternoon with the needed part on the truck.
Older furnaces in Chicago are more expensive to repair. A 20 year old unit often needs parts that take longer to obtain than the items we keep in stock.
What is the most expensive furnace part to repair?
The heat exchanger is the most expensive furnace part to repair, priced at $1,000 to $3,500 in Chicago.
This is the metal chamber that separates burner exhaust from the air that moves through your HVAC system and into the home.
If it cracks, carbon monoxide can enter the house. Safe heating comes first, so a cracked exchanger means the furnace is shut down until replacement, and Frontline Heating & Cooling will not relight it.
On a high efficiency furnace, the secondary heat exchanger is also where condensate develops. When that part cracks, water leaks at the bottom of the cabinet before the unit even fails a combustion test.
For that reason, every winter leak call includes a furnace inspection of the secondary exchanger.
After that, the next most costly repairs are the blower motor at $400 to $700 and the inducer motor at $450 to $900.
The least expensive repairs are the ignitor at $150 to $300 and flame sensor cleaning, which we handle during the diagnostic visit.
Should a 25 year old furnace be repaired or replaced?
In nearly every case, a 25 year old furnace should be replaced instead of repaired, since a gas furnace typically lasts 15 to 20 years.
The $5,000 rule works like this: multiply the furnace’s age in years by the repair cost. If the total is above $5,000, replacement is the better option.
For example, a 25 year old furnace with a $349 condensate pump repair totals $8,725, which points to replacement even though the fix itself is inexpensive.
By contrast, a 12 year old furnace with the same repair totals $4,188, which means the furnace needs to be repaired rather than replaced.
Frontline Heating & Cooling makes that decision in the basement, not from a sales office.
The table below shows how a leak repair compares with other common furnace repairs in Chicago, along with the furnace age at which the $5,000 rule shifts each one to replacement.
| Furnace repair | Chicago price, 2026 | Furnace age where the $5,000 rule says replace |
|---|---|---|
| Ignitor replacement | $150 to $300 | About 22 years |
| Leak repair, condensate line, pump, or pan | $149 to $395 | About 18 years |
| Blower motor replacement | $400 to $700 | About 9 years |
| Complex repairs | $1,400 and up | About 3 years |
| Heat exchanger replacement | $1,000 to $3,500 | About 2 years |
| New furnace, installed | $3,500 to $7,500 | Replacement |
| New high efficiency furnace, installed | $9,000 and up | Replacement |
A leak repair almost never crosses the $5,000 rule by itself. A heat exchanger usually does, which is why the cracked exchanger line in the leak table above becomes a replacement estimate.
Chicago installation quotes depend on Cook County labor rates, and a City of Chicago permit applies when the furnace type or size changes. Every furnace replacement quote includes financing.
From the truck
What a Frontline technician checks first on a leak call
The same order on every visit, so the diagnosis takes minutes and the quote is written before the truck moves.
- The condensate drain line and trap, because a clog causes most summer and winter leak calls.
- The condensate pump float switch, because a stuck float floods the pan before the pump ever runs.
- The drain pan and its slope under the AC coil, because a rusted pan drips at the corner farthest from the drain.
- The secondary heat exchanger on a high efficiency furnace, because a crack shows up as water before it shows up as a failed combustion test.
Can a plumber fix an HVAC leak?
No. A plumber cannot repair an HVAC leak, because the water is coming from the furnace or air conditioner, not from a pipe.
Condensate lines, drain pans, pumps, and humidifiers are all parts of heating and cooling systems, and a licensed HVAC contractor carries them on the truck.
A plumber handles the floor drain, the sump pit, and the water lines inside the wall.
Since the two trades often overlap in Chicago basements, Frontline Heating & Cooling tells you right away which one you need.
We would rather direct you to the correct trade than sell you the wrong repair.
Our plumbing partner
Rescue Plumbing
Rescue Plumbing is the Chicago plumber Frontline works with. If the leak is plumbing, we call Rescue Plumbing for you. If a plumbing visit uncovers a heating issue, they send it back to us.
- Basement leak repair water at the wall or the floor
- Sump pump repair water rising from the pit
- Pipe repair a supply or drain line inside the wall
What are the warning signs your furnace needs repair before it leaks?
In Chicago, most furnace failures give warning before water reaches the floor. Frontline Heating & Cooling sees the same five symptoms on almost every repair call.
- The furnace short cycles, running for a minute or two before shutting off, which usually means a clogged filter or a tripped limit switch and can raise heating bills.
- You turn the heat up and nothing happens, which often points to the ignitor, the flame sensor, or the thermostat itself.
- The blower is loud or grinding, which suggests a motor or bearing nearing failure.
- The pilot light or ignitor clicks without lighting, which is a $150 to $300 repair if caught early.
- Water or rust appears at the bottom of the cabinet, which is the leak issue covered on this page.
Catching any of these in October rather than January turns a same day emergency into a scheduled furnace tune up. Regular maintenance is what keeps it from getting that far.
Chicago winters are unforgiving, and the furnace that fails first is usually the one no one checked in the fall.
What makes furnace repair in Chicago cost what it does?
Angi puts the average Chicago furnace repair at $291 in 2026, with most bills between $124 and $476. Where a bill lands in that range comes down to local factors.
The housing stock is older than in most of the country, and the winters are harder on HVAC equipment. Frontline Heating & Cooling sees four Chicago patterns that national pricing guides miss.
- In Logan Square and Lakeview two flats, two furnaces are often stacked in one building, so water on a first floor ceiling is frequently coming from the unit above.
- Bungalows in Oak Lawn and Orland Park still commonly use furnaces installed before 2005, and parts for a 20 year old furnace take longer to source.
- High efficiency furnaces vented through a side wall can freeze at the exhaust when January lows fall below 10 degrees, forcing condensate back into the cabinet.
- In a Chicago home up to four stories, repairing a furnace or replacing it in kind needs no permit. Changing the furnace type or size, such as an 80 percent to 95 percent upgrade with new venting, needs a City of Chicago Department of Buildings permit, which Frontline includes in the quote.
Cook County labor rates are the final factor. HVAC companies in Chicago price against those rates, which is why a local bill rarely matches the number on a national cost website.
What should I do before calling for furnace repair?
Before you call for furnace repair in Chicago, spend five minutes on three checks that solve a good share of all calls.
Frontline Heating & Cooling would rather talk you out of a service call than bill you for one.
- Make sure the thermostat is set to heat and the batteries are not dead, because a dead thermostat looks exactly like a dead furnace.
- Remove the air filter and hold it to the light, because a filter you cannot see through causes about 30 percent of furnace problems. Filter changes are the routine maintenance worth doing yourself.
- Check the breaker and the wall switch for the furnace, since they get flipped off by accident more often than people expect.
If the furnace is leaking, shut it off at the thermostat and photograph the puddle and the unit. Text it to us.
Jared and the crew will read the photo, load the most likely part on the truck, and give you a quote before leaving the driveway.
Furnace repair cost questions Chicago homeowners ask
How much does it cost to fix a furnace leak?
In 2026, a furnace leak in Chicago costs $149 to $395 to repair through Frontline Heating & Cooling. The cheapest and most common fix is a clogged condensate line. The most expensive is a cracked secondary heat exchanger at $1,000 to $3,500, which usually means replacement.
How much is an HVAC service call in Chicago?
At Frontline Heating & Cooling, an HVAC service call in Chicago costs $89. It includes diagnosis, the float switch test, and a written quote. If you approve the work on the spot, we credit the fee to the repair, so the diagnosis does not cost extra.
Does homeowners insurance pay for furnace leaks?
Standard homeowners insurance does not cover a furnace leak caused by wear, age, or a clogged drain line. It does cover sudden damage from fire, lightning, or a burst pipe. If you want mechanical coverage, you can add an equipment breakdown endorsement, and Frontline Heating & Cooling documents each repair for the claim.
How often should I have my furnace checked in Chicago?
A Chicago furnace should receive annual maintenance, ideally one inspection in September or October before the first cold night. A Frontline Heating & Cooling furnace maintenance visit cleans the flame sensor, tests the ignitor, checks the heat exchanger, and treats the condensate line so it will not clog the following summer.
Can I repair a furnace leak myself?
You can clear a minor condensate clog with a wet dry vacuum on the outdoor end of the line. Anything inside the cabinet, including the trap, the pump, and the secondary heat exchanger, needs a Frontline Heating & Cooling technician, because a wet control board becomes a replacement once power is restored.
Sources
- ENERGY STAR, Furnaces, Key Product Criteria: efficiency ratings for gas furnaces.
- City of Chicago, HVAC work that does not require a building permit: repairing or replacing a furnace in kind in a home up to four stories.
- Angi: furnace repair cost in Chicago, 2026, and furnace lifespan, updated July 2026.
- CBS News, June 2026: the $5,000 rule for HVAC repair versus replacement.
- Frontline Heating & Cooling, furnace repair pricing in Chicago, current as of September 2026.
Frontline has your back
Skip the service call. Send a photo instead.
Text a photo of the puddle and the furnace to (872) 234-1019. Jared and the crew read it, load the likely part on the truck, and give you a price before we leave the driveway. Call before noon and we are at your door this afternoon.
