Keep your rooftop unit running reliably—avoid costly downtime
Your commercial rooftop unit is critical infrastructure. When it fails, your building loses temperature control, productivity drops, and emergency repair costs spike. J&G Heating & Air Conditioning provides preventive maintenance plans and responsive emergency repair service (Mon–Sun, 6:00 AM–10:00 PM, after-hours fee applies) for commercial RTUs across Lancaster County. Our NATE-certified technicians diagnose problems quickly, perform repairs to manufacturer specifications, and keep your business comfortable year-round.
Don’t wait for a catastrophic failure. Whether you need emergency repair or preventive maintenance, contact us today.
We repair and maintain commercial rooftop units throughout Lancaster County:
Don’t wait for complete system failure. These warning signs indicate your commercial rooftop unit needs professional attention now.
If your thermostat calls for cooling or heating but the RTU doesn’t start, the problem could be a tripped breaker, a failed contactor (electrical switch that engages the compressor), low refrigerant triggering a safety shutoff, a broken control transformer, or a defective thermostat sending the wrong signal. We run voltage tests and control circuit diagnostics to identify the root cause within the first 30 minutes of arrival.
Your RTU is running—the outdoor unit hums—but little to no conditioned air comes from the supply vents. This usually means a failed supply fan motor, a clogged indoor filter, a severely blocked evaporator coil, a broken drive belt, or a control failure preventing the blower from operating. We check blower motor voltage, inspect filters and coils, and test fan operation.
A hissing sound near the outdoor unit, oily residue on copper lines, or poor cooling performance despite the system running signals a refrigerant leak. Leaks get worse over time and are heavily regulated under EPA law. We locate leaks using electronic detector equipment and dye tracers, repair the connection or component, evacuate the system, and recharge with the correct refrigerant type and quantity.
The condenser fan should spin when the RTU is calling for cooling. A silent fan indicates a failed fan motor, broken shaft, or a tripped capacitor. Grinding, squealing, or metal-on-metal sounds warn that internal bearing wear is progressing—these are urgent signs requiring immediate attention to prevent catastrophic failure.
A sudden spike in energy bills without a change in thermostat settings or occupancy usually means your RTU is working harder to deliver the same conditioning. Causes include low refrigerant charge (leak), a clogged condenser coil restricting heat rejection, a fouled evaporator coil, a failed compressor starting to struggle, or a stuck outdoor damper.
Water inside your facility near the HVAC return air path, or pooling around the RTU on the roof, signals a clogged condensate drain line, a failed drain pan, or a cracked secondary drain pan. RTUs produce condensation during cooling; that water must drain. Blockages cause backups that damage insulation, building materials, and electrical systems.
Every commercial RTU repair we do follows the same proven process—designed to diagnose problems quickly, perform repairs correctly, and get your facility back to normal operation. Tap any step below to see exactly what happens.
You call our emergency line and describe the problem: no cooling, weak airflow, strange noise, or visible water damage. Our dispatcher logs your facility address, notes your system details, and prioritizes your call. For true emergencies (total loss of heating/cooling in occupied space), we dispatch the nearest technician immediately. They arrive in a fully equipped service truck with capacitors, fan motors, contactors, refrigerants, and diagnostic tools. Within 15 minutes of arrival, they begin systematic diagnosis.
The technician performs a rapid visual walkthrough: outdoor unit cleanliness, visible corrosion on electrical connections, refrigerant line condition, roof curb integrity, ductwork connections, thermostat display, and breaker/disconnect status. They use a multimeter to test voltage at the thermostat, contactor, capacitor, compressor, and blower motor. They note any unusual odors (burning insulation, refrigerant smell, mustiness), sounds, or signs of previous repairs. This triage typically pinpoints the problem category in the first 10–15 minutes.
If visual and electrical checks don’t reveal the problem, the technician connects a refrigerant gauge set (a specialized diagnostic tool with low-side and high-side pressure gauges) to the RTU’s service ports. Normal pressures vary by ambient temperature and RTU size, but abnormal readings instantly signal problems: low pressure suggests a leak or undercharge; high pressure suggests a clogged condenser, blockage, or air in the system. The technician calculates superheat and subcooling to determine if refrigerant is being metered correctly.
Once the problem is identified, the technician performs the repair. Common repairs include replacing contactors, capacitors, fan motors, thermostats, or control boards; repairing or replacing refrigerant line leaks; clearing condensate drain lines; cleaning condenser coils; or replacing worn belt-drive components. For major component failures (compressor replacement, complete control system overhaul), we may recommend a phased approach or coordinate with your facility maintenance team. We use OEM parts where required and manufacturer-approved replacement components.
Before we leave, the technician runs the RTU under full load to verify normal operation. They check that cooling or heating output is correct, that the blower responds to thermostat calls, that all safety controls function, and that the system cycles normally. They measure pressures and temps again to confirm the repair. They provide you with a detailed work order listing what was repaired, parts installed, hours worked, and recommendations for future maintenance. This documentation is your record for warranty, insurance, and facility management tracking.
When your RTU fails and your facility loses temperature control, we respond. Emergency dispatch (Mon–Sun, 6:00 AM–10:00 PM, after-hours fee applies), rapid diagnosis, and same-day repair for most emergencies. We carry common replacement parts on every service truck—fan motors, capacitors, contactors, compressors, control boards—so we can often fix you the same day you call.
Request Emergency RepairPlanned maintenance stops emergencies before they happen. We offer quarterly, semi-annual, and annual maintenance contracts that include inspections, filter changes, coil cleaning, refrigerant checks, electrical testing, and detailed reporting. Members get priority dispatch and reduced rates on repairs.
Set Up Maintenance PlanRefrigerant leaks reduce efficiency, violate EPA regulations, and cost money. We locate leaks using electronic detectors and dye tracers, repair the connection or component, evacuate the system, and recharge with the correct refrigerant type and amount. All work meets EPA standards.
Call for Leak DiagnosisCompressor failures are expensive but necessary. We replace failed compressors, blower motors, and fan motors with OEM or approved components, test everything thoroughly, and provide warranty documentation. We discuss whether replacement makes economic sense versus an older unit.
Discuss Repair OptionsModern RTUs use complex control systems. Failed control boards, thermostats, or sensor failures prevent proper operation. We diagnose control circuit problems, replace boards, reprogram thermostats, and test all safety interlocks. We source replacement components from authorized suppliers.
Schedule Control System RepairPoor ductwork performance reduces RTU efficiency and comfort. We seal leaky connections with mastic, insulate uninsulated sections, clean ducts if needed, and balance airflow across zones. Proper ductwork amplifies the benefit of any RTU repair or upgrade.
Request Ductwork AssessmentBefore peak heating or cooling season, we perform seasonal inspections: filter replacement, coil cleaning, refrigerant pressure check, electrical connection inspection, and thermostat testing. These tune-ups prevent mid-season failures and catch early signs of wear.
Schedule Seasonal Tune-UpIf your RTU works with a boiler for hydronic heating, we service the complete system. We inspect pumps, valves, expansion tanks, and piping; perform water treatment; and coordinate heating with cooling to optimize comfort and efficiency.
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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.
Equipment failure costs money in downtime, discomfort, and emergency repair bills. Preventive maintenance prevents failures and keeps your facility operating smoothly. Whether you need emergency repair or planned maintenance, J&G Heating & Air Conditioning has the expertise and responsive emergency availability to keep your commercial RTU running.
Is your RTU failing or do you want to prevent problems? Request service now. We’ll diagnose the issue, explain your options, and get you back to normal operation fast.
Don’t let equipment failure disrupt your business. Trust the certified experts at J&G Heating & Air Conditioning.
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