Pennsylvania winters are unforgiving, and a dead furnace in January means your family is in danger of freezing pipes and worse. J&G Heating & Air Conditioning sends NATE-certified technicians across Lancaster County for emergency furnace diagnosis and repair during emergency hours (Mon–Sun, 6:00 AM–10:00 PM, after-hours fee applies). We’ve been fixing heating systems since 1997, and we know exactly how to pinpoint problems—whether it’s a failed igniter, a stuck valve, a broken blower motor, or a control board that won’t fire—and get you back to warm, safe heat.
Your furnace emergency is our priority. When you’re dealing with a heating failure in the middle of winter, you need a contractor who responds fast, diagnoses accurately, and fixes the problem right the first time. Our NATE-certified technicians have the expertise to handle any furnace brand or fuel type, and emergency service is available Mon–Sun, 6:00 AM–10:00 PM (after-hours fee applies).
Don’t endure a cold night. Book your repair appointment online or call our dispatch team immediately for same-day response.
J&G Heating & Air Conditioning provides furnace repair across Lancaster County. Emergency service is available Mon–Sun, 6:00 AM–10:00 PM (after-hours fee applies). When your heat fails, our emergency team dispatches a technician equipped with diagnostic tools and common replacement parts to get you warm again quickly. We’ve spent nearly 30 years building expertise in the heating challenges of our region’s climate.
Don’t wait for a complete breakdown. These warning signs indicate your furnace needs professional attention before it fails completely. Tap any sign below to learn what it means and what we can do to fix it.
Your thermostat is set to heat, but the furnace doesn’t ignite or powers down within seconds. This could signal a failed igniter (the component that lights the pilot or gas flame), a broken limit switch (a safety device that prevents overheating), a thermostat wiring problem, or a draft safety switch that’s closing because exhaust isn’t venting properly. Sometimes it’s a blown breaker or a safety interlock tripped by a previous shutdown. We diagnose which component is at fault during the service call.
Your furnace is running—the blower is on and air is blowing—but it’s not warm or only slightly warm. Possible causes include a cracked heat exchanger (the component that transfers combustion heat to your home’s air), a failed gas valve that’s not metering fuel correctly, a blocked burner nozzle, or low gas pressure from a meter issue. A cracked heat exchanger is serious (risk of carbon monoxide) and requires immediate professional assessment. We test combustion, measure heat output, and inspect the heat exchanger visually to pinpoint the cause.
Furnaces produce a quiet whoosh of air and occasional clicks as the control cycles on and off. Banging from the furnace cabinet itself signals a component vibrating loose—possibly a burner assembly or a heat exchanger crack. Rumbling or roaring during operation warns of a dirty burner or incomplete combustion. Squealing from the blower motor means bearing wear and failure is near. These noises are red flags and warrant immediate inspection.
A burning smell on startup (especially after a long off-season) is normal as dust burns off. But a persistent burning smell—especially if accompanied by visible soot around the furnace cabinet—signals incomplete combustion, a clogged burner, or contaminated fuel. This is a carbon monoxide hazard and needs immediate professional attention. Never ignore burning smells.
Your furnace is running but the blower motor isn’t spinning, or it’s running nonstop even when the thermostat isn’t calling for heat. A non-starting blower might be a failed motor, a broken belt (on older models), or a control board failure. A constantly-running blower could be a thermostat malfunction, a stuck fan relay, or a control board issue. Both scenarios waste energy and need repair.
If your furnace has a pilot light (older models), it should stay lit consistently through the heating season. A pilot that won’t light or keeps going out signals a thermocouple failure (the safety device that detects the pilot), a clogged pilot nozzle, or a gas valve problem. Modern furnaces use electronic igniters instead of pilots. If the igniter keeps sparking repeatedly without igniting, the igniter is failing or gas isn’t reaching the burner properly.
Every furnace repair we do follows the same proven process — designed to deliver fast, accurate diagnosis and reliable repairs that last. Tap any step below to see exactly what happens.
You call or book online describing your furnace problem (won’t start, no heat, strange noise, burning smell). Our dispatcher logs the call, prioritizes it as an emergency if needed, and dispatches the nearest technician with a fully equipped service truck. The technician arrives, introduces themselves, and begins a visual inspection: examining the furnace cabinet for obvious damage, checking gas and electrical connections, looking for soot or discoloration around the burner, and listening for unusual sounds or sensing any burning smells. This rapid triage usually reveals whether the problem is electrical, gas-related, or mechanical.
During this visit, we also review your account and service history to understand any previous repairs or maintenance that might be relevant to the current problem.
The technician tests gas pressure at the furnace gas valve using a manometer (a pressure gauge). Low pressure signals an issue upstream—clogged filter on the gas meter, a kinked line, or utility-side problem. They also measure the temperature rise across the furnace heat exchanger by placing thermometers at the return air duct and supply duct—this tells them whether the furnace is producing heat correctly. Simultaneously, they use a multimeter to test voltage at the igniter or pilot control, the blower motor, and the thermostat to confirm power is reaching where it should. This three-point diagnostic (gas pressure, heat output, electrical power) narrows down the problem immediately.
This comprehensive testing approach allows us to quickly identify whether the issue is fuel-related, electrical, or mechanical, saving time and ensuring accurate diagnosis.
If the furnace is starting, the technician performs a combustion test using a flue gas analyzer—a device that measures oxygen, carbon dioxide, carbon monoxide, and combustion efficiency in the exhaust gases. This reveals whether the burner is operating safely and whether the fuel-air ratio is correct. They also visually inspect the heat exchanger (the component where combustion heat is transferred to air) for visible cracks, corrosion, or separation of seams. A cracked heat exchanger is a carbon monoxide hazard and requires immediate attention.
This safety-focused inspection ensures your family’s protection while identifying the root cause of heating problems.
If combustion is normal but the furnace still isn’t operating correctly, the technician tests individual components: igniter continuity (does it spark?), thermostat wiring for breaks or shorts, blower motor for electrical continuity and mechanical seizure, limit switches for proper operation, and draft safety switches (pressure switches that confirm exhaust is venting safely). A component tester or multimeter identifies which one has failed. They also check for tripped circuit breakers or a blown fuse in the furnace control board.
Our systematic approach to component testing ensures we identify the exact failed part without unnecessary replacements.
Once the problem is identified, the technician performs the repair. This might mean replacing an igniter (30 minutes, usually in stock), replacing a limit switch or draft switch (45 minutes to 1 hour), replacing the blower motor (1–2 hours), replacing the thermostat (30 minutes to 1 hour if a new unit is needed), cleaning or replacing the burner assembly (1–2 hours), gas valve replacement (1–2 hours), or control board replacement (1–2 hours). After repair, the system is restarted and monitored: combustion is tested again, heat output is measured to confirm it matches specifications, all safety controls are tested, and the system is allowed to run through a complete heating cycle to confirm it operates smoothly without unexpected shutdowns.
We use only manufacturer-approved parts and follow strict installation procedures to ensure reliable, long-lasting repairs.
Before we leave, the furnace is powered up and cycled through multiple on/off sequences to confirm reliable ignition, consistent heat output, and proper shutdown. The technician explains what failed, why it failed, what the repair involved, and any maintenance recommendations to prevent future problems. You receive documentation: a service receipt with description of repair, parts replaced, labor hours, and any warranty terms (we warranty our work for one year). We also provide our emergency contact number for any questions during the first days of operation.
Our thorough documentation and follow-up support ensure you have complete confidence in the repair and know exactly what was done.
Our technicians are equipped to handle all types of furnace repairs, from simple component replacements to complex system diagnostics. Here are the most common repairs we perform for Lancaster County homeowners.
Electronic igniters spark the gas flame and wear out over time. A failed igniter means no ignition and no heat. Replacement is straightforward and takes 30 minutes. We stock multiple igniter types, so most repairs are completed same-day without delay.
Schedule RepairLimit switches prevent overheating; draft safety switches confirm exhaust is venting safely. When either fails, the furnace won’t start or shuts down unexpectedly. Replacement is quick and our technicians carry these parts in the service truck.
Get ServiceThe blower motor pushes heated air through your ducts. A failed motor means the furnace heats but no warm air reaches your rooms. Replacement takes 1–2 hours and can often be completed same-day. We stock replacement motors for all major brands.
Schedule ReplacementA faulty thermostat won’t signal the furnace to start, or it signals nonstop causing constant cycling. Thermostat repairs range from wiring fixes to full replacement. We ensure the new unit communicates correctly with your furnace before we leave.
Get ServiceA cracked heat exchanger is serious—it risks carbon monoxide leaking into your home. Small surface cracks can sometimes be sealed; larger cracks require component replacement. We inspect thoroughly and explain all options before proceeding.
Schedule InspectionGas valves regulate fuel flow; pilot controls manage the pilot light (on older furnaces). Failed valves prevent ignition or cause weak flames. We test valves using pressure gauges and replace them if needed. Diagnosis and repair typically take 1–2 hours.
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We believe every homeowner in Lancaster County deserves access to reliable heating and cooling — regardless of budget. That’s why J&G Heating & Air Conditioning partners with trusted financing providers to offer flexible payment plans that fit your financial situation. Whether you’re replacing an aging boiler, upgrading to a high-efficiency air conditioning system, installing a high-efficiency heat pump, or investing in a new generator system, financing allows you to enjoy the comfort you need today while spreading payments over time.
Our team will walk you through every available option during your free estimate, helping you understand monthly payment amounts, interest rates, and approval requirements. We want the financial side of your project to feel just as comfortable as the temperature in your home.
As an authorized Wells Fargo financing partner, J&G Heating & Air Conditioning offers a range of credit options to help you manage the cost of your new heating or cooling system. With competitive rates and flexible terms, qualifying homeowners can enjoy convenient monthly payments that fit comfortably into their household budget.
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Through our partnership with PowerPay, we provide another trusted financing pathway for Lancaster County homeowners ready to upgrade their home comfort. PowerPay’s streamlined application process and flexible repayment plans make it easy to get started on your project without delay.
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GoodLeap offers flexible financing options and competitive rates, making it easy for homeowners to invest in high-efficiency heating, cooling, and generator systems. With a simple application process and a variety of repayment terms, upgrading your home comfort doesn’t have to mean a large upfront cost.
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When you join one of our maintenance programs, you’ll receive scheduled tune-ups performed by our NATE-certified technicians who know your system inside and out. We’ll clean critical components, check refrigerant levels, inspect electrical connections, test safety controls, and ensure everything is operating as it should.
Regular maintenance doesn’t just prevent breakdowns — it also helps lower your energy bills and protects your manufacturer warranty coverage. It’s one of the smartest investments you can make in your home’s comfort and your family’s safety.
A cold furnace in winter is a crisis, and J&G Heating & Air Conditioning is equipped to help immediately. We’ve served Lancaster County families for nearly three decades with honest diagnostics, transparent pricing, and responsive emergency service (Mon–Sun, 6:00 AM–10:00 PM, after-hours fee applies). When your heat fails, we show up fast, diagnose accurately, and fix your furnace right.
Maintenance prevents emergencies. Join our customers who schedule annual tune-ups before each heating season. A small investment in maintenance now saves thousands in emergency repairs later. Join our maintenance plan for automatic seasonal service and priority emergency response.
Annual maintenance before winter catches problems early, cleans components, and ensures safe operation. One tune-up per year prevents costly emergency repairs.
Furnace MaintenanceIf your furnace is 18+ years old or repairs are becoming frequent, replacement may be the smarter long-term choice. We install high-efficiency furnaces with warranties.
Furnace InstallationConsidering a heat pump to replace your furnace? We service and repair heat pump systems for customers wanting single-system heating and cooling.
Heat Pump RepairImprove your home’s air quality with whole-home air purifiers, UV lights, and humidity control systems that work with your furnace.
Indoor Air Quality SolutionsIf repair or replacement costs are higher than expected, we partner with Wells Fargo, Power Pay, and Goodleap to offer flexible payment options.
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