Most Maryland homeowners pay $150 to $700 for a heating repair, with the average landing near $350. Major work — a cracked heat exchanger, a failed compressor, a boiler heat exchanger — runs $1,000 to $3,500.
But “heating repair” covers three completely different machines. A gas furnace, a hydronic boiler, and a heat pump fail in different ways, and the parts are not interchangeable in price or urgency. Most cost guides average them together, which produces a number that describes nobody’s actual repair.
This guide breaks the pricing out by system type, explains the safety issues that change the calculation, and gives you a clear test for when repair stops being the right investment.
Gas Furnace Repair Costs
Furnaces are the most common heating system in Maryland, and they have the most parts that can fail.
| Repair | Typical installed cost |
| Flame sensor cleaning or replacement | $100 – $300 |
| Hot surface ignitor | $150 – $400 |
| Thermostat replacement | $100 – $500 |
| Pressure switch | $150 – $400 |
| Transformer | $150 – $500 |
| Gas valve | $400 – $1,000 |
| Draft inducer motor | $400 – $1,100 |
| Control board | $300 – $700 |
| Blower motor | $400 – $1,200 |
| Heat exchanger | $1,500 – $3,500 |
The ignitor and the flame sensor account for a large share of all furnace service calls. Both are inexpensive, both are wear parts, and both tend to fail on the first genuinely cold night of the season — which is also when after-hours rates apply.
The heat exchanger is the outlier, and not only because of price. See the safety section below.
Need service? See our furnace repair service in Maryland, or for local homeowners, furnace repair in La Plata.
Boiler Repair Costs
Southern Maryland has a meaningful number of older homes running hydronic heat — radiators and baseboard loops rather than forced air. Boilers are simpler machines than furnaces in some ways, but the repairs involve water under pressure, which brings its own considerations.
| Repair | Typical installed cost |
| Thermostat or aquastat | $140 – $400 |
| Ignitor | $150 – $400 |
| Zone valve | $200 – $600 |
| Expansion tank | $200 – $800 |
| Induced draft fan | $200 – $600 |
| Circulator pump | $300 – $1,000 |
| Gas valve | $300 – $900 |
| Control board | $400 – $1,200 |
| Leak repair (piping or joints) | $200 – $1,500 |
| Heat exchanger | $1,000 – $3,500 |
Most boiler repairs land between $200 and $1,200. One practical tip: if a single zone valve has failed and the others are original to the system, replacing them all in one visit costs less than three separate service calls over the next few winters.
We service gas, oil, and steam systems. See our boiler repair service in Maryland, or boiler repair in La Plata.
Heat Pump Repair Costs
Heat pumps are increasingly common in Maryland, and because they run year-round, they accumulate roughly twice the operating hours of a furnace.
| Repair | Typical installed cost |
| Capacitor | $150 – $400 |
| Thermostat | $100 – $400 |
| Contactor | $150 – $400 |
| Defrost control board | $200 – $650 |
| Auxiliary heat strip | $250 – $700 |
| Reversing valve | $450 – $1,200 |
| Condenser fan motor | $250 – $650 |
| Refrigerant leak detection and repair | $400 – $1,500 |
| Condenser or evaporator coil | $800 – $2,800 |
| Compressor | $1,200 – $3,500 |
Two failures are specific to heat pumps and worth recognizing.
The reversing valve is what lets the system switch between heating and cooling. If your heat pump cools fine in summer but blows cool air in winter, the reversing valve is a prime suspect.
The defrost control board manages the cycle that clears frost off the outdoor coil. On a damp Maryland morning in the mid-30s, an outdoor unit will ice up — that is normal, and the system should clear it automatically. What is not normal is a unit that stays encased in ice.
See our heat pump repair service in Maryland, or heat pump repair in La Plata.
Why Your Heat Pump Bill Spiked
This is the most common heat pump call we get, and it is often not a repair at all.
Every heat pump has backup electric resistance heat — the “auxiliary” or “emergency” heat strips. When outdoor temperatures drop far enough, or when the system is running its defrost cycle, those strips engage to supplement the heat pump. They are dramatically more expensive to run than the heat pump itself.
During a genuine Maryland cold snap, seeing “AUX” on your thermostat is normal and your bill will reflect it. What is not normal:
- AUX running in mild weather, in the 40s and 50s. That points to a refrigerant charge problem, a failed reversing valve, or a miscalibrated thermostat.
- EM HEAT left switched on. Emergency heat bypasses the heat pump entirely and runs on resistance heat alone. Homeowners sometimes flip it on during a cold week and forget it. That single switch can double a winter electric bill.
- Short cycling — the system turning on and off every few minutes rather than running longer, steadier cycles.
If your bill jumped and the house feels fine, check the thermostat before you call anyone. It is a two-second fix surprisingly often.
The Safety Repairs You Do Not Postpone
Most heating repairs can wait a day or two. These cannot.
A cracked heat exchanger. The heat exchanger is what separates combustion gases — including carbon monoxide — from the air circulating through your home. A crack lets CO into your living space. If a technician diagnoses one, do not run the furnace. Warning signs include a yellow or flickering burner flame instead of a steady blue one, soot around the furnace, and a persistent sulfur or formaldehyde smell.
A carbon monoxide detector alarm. Get everyone out of the house first, then call from outside. Not later, not after checking the furnace yourself.
The smell of gas. A rotten-egg odor near the equipment means leave the house, then call your gas utility from outside. Do not flip light switches or use anything electrical on your way out.
This is also the reason to be careful about who works on a gas appliance. Maryland licenses HVAC contractors through the state Board of Heating, Ventilation, Air Conditioning and Refrigeration Contractors, and combustion work is not a place to save money on an unlicensed handyman.
What Emergency Heating Repair Costs
A no-heat call at night, on a weekend, or on a holiday typically adds 25 to 50 percent to the labor portion, and many companies apply a flat emergency dispatch fee on top. A $200 ignitor replacement on a Tuesday afternoon can run $350 to $500 at 10 p.m. on a Saturday.
Sometimes that premium is obviously worth paying. Call immediately, without weighing the surcharge, if:
- Indoor temperatures are dropping toward freezing and pipes are at risk
- Anyone in the house is elderly, an infant, or medically vulnerable
- You suspect carbon monoxide or smell gas
If the house is uncomfortable but safe and you have space heaters and blankets, waiting for regular hours is a legitimate choice — and cheaper. A good contractor will tell you honestly which situation you are in. Our emergency heating repair service in Maryland is available when it genuinely cannot wait.
One note on demand: when a hard freeze hits Southern Maryland, every HVAC company in the region gets slammed at once. The homeowners who had a fall tune-up are overwhelmingly not the ones making those calls.
Should You Repair or Replace?
The standard test: multiply the repair quote by the age of the system in years. If the result clears roughly $5,000, put the money toward replacement.
A $300 ignitor on a nine-year-old furnace comes to $2,700 — fix it. A $2,200 heat exchanger on a sixteen-year-old furnace comes to $35,200. That system is finished.
Some Maryland-specific adjustments:
- A cracked heat exchanger on a furnace over 12 years old is almost always a replacement. Putting a major new component into equipment near the end of its life rarely pays off.
- A compressor failure on a heat pump over 10 years old is usually replacement territory, especially if the system uses R-410A, since refrigerant costs keep climbing as production is phased down.
- If you heat with oil, weigh replacement more heavily than the formula suggests. Maryland’s electrification rebates currently cover up to $15,000 for switching from a fossil-fuel system to a heat pump — which can make conversion cost less out of pocket than a like-for-like oil replacement.
Expected service life in Maryland: 15 to 25 years for a furnace or boiler, 12 to 18 for a heat pump.
For system pricing and the full rebate picture, see our HVAC replacement cost guide for Maryland. If you have already decided, we handle heating replacement and installation across Maryland.
The Fall Tune-Up Is the Cheapest Repair
A heating tune-up runs $100 to $250 in Maryland. Almost every expensive winter emergency starts as something a fall inspection would have caught.
A tune-up checks the heat exchanger for cracks, cleans the flame sensor, tests the ignitor, verifies gas pressure and combustion, checks the inducer and blower, and confirms safety controls actually shut the system down when they should. On a heat pump, it verifies refrigerant charge, tests the defrost cycle, and checks that auxiliary heat is engaging only when it should.
There is also a warranty consideration. Most manufacturer warranties require documented annual maintenance. If your heat exchanger cracks in year eight and you have no service records, the manufacturer may deny the claim — turning a covered repair into a full out-of-pocket one.
An HVAC maintenance plan handles the scheduling so it does not depend on you remembering in October.
Heating Repair in La Plata and Southern Maryland
KPK Enterprise is a family-owned HVAC company serving La Plata, Waldorf, Hughesville, Bensville, Clinton, and the surrounding Southern Maryland communities. We service heat pumps, gas furnaces, hydronic boilers, and oil heating systems — the last one matters here, because Charles County still has plenty of homes on oil that most companies would rather not touch.
What makes us different is direct contact with ownership. When you get a quote for a repair that sounds expensive, you can talk to someone who will actually explain it.
- Heating repair across Maryland
- Emergency heating repair for no-heat situations
- Furnace, boiler, and heat pump repair in La Plata
When the season turns, the same logic applies to your cooling system — see our guide to AC repair costs in Maryland.
Frequently Asked Questions
How much does heating repair cost in Maryland?
Most heating repairs cost $150 to $700, with the average around $350. Common failures like an ignitor or flame sensor sit at the low end. Major components — a heat exchanger, compressor, or boiler heat exchanger — run $1,000 to $3,500.
Why is my heat pump running up such a high electric bill?
Most likely the auxiliary or emergency heat strips are engaging. That is normal during a genuine cold snap, but if AUX is running in mild weather, or if EM HEAT was switched on and left on, you are paying for expensive resistance heat you do not need. Check the thermostat first.
Is a cracked heat exchanger dangerous?
Yes. The heat exchanger separates combustion gases, including carbon monoxide, from the air circulating through your home. A crack lets CO into your living space. Do not run the furnace once one has been diagnosed. On a furnace over 12 years old, replacement is usually the better decision than repair.
How much does emergency heating repair cost in Maryland?
Expect 25 to 50 percent more on labor for nights, weekends, and holidays, plus a possible flat dispatch fee. If anyone in the house is vulnerable, if pipes are at risk of freezing, or if you suspect a gas or carbon monoxide issue, call immediately regardless of cost.
Is it worth repairing a 20-year-old furnace?
Rarely, unless the repair is minor. Furnaces last 15 to 25 years, and a major repair on an aging unit is usually followed by another failure. Multiply the repair cost by the system’s age — if it clears about $5,000, put the money toward replacement.
How often should my heating system be serviced?
Once a year, ideally in fall before the first cold snap. Annual service catches the failures that become winter emergencies, and most manufacturer warranties require documented maintenance to remain valid.
Get a Straight Diagnosis Before You Decide
The worst heating repair outcome is not an expensive one. It is paying for a repair on a system that should have been replaced, or replacing a system that had years left in it.
If your heat is out or something does not sound right, contact KPK Enterprise for an honest diagnosis. We serve La Plata and all of Southern Maryland.