Gas Furnace Repair and Replacement

A gas furnace can lose heat because of an ignition fault, restricted airflow, a failed control, or a problem in the combustion system. Billy Butler Heating and Air Conditioning handles residential gas furnace repair for homeowners in Lawrenceville, GA, and other Gwinnett County communities. Before any repair begins, we inspect the equipment and explain what testing found.

If the furnace will not start, blows cold air, turns on and off too often, or makes an unfamiliar noise, it is better to test the system than guess which part has failed. Gas heating repair involves fuel, electrical, airflow, and safety components that must work together through the full heating cycle.

Signs Your Gas Furnace Needs Service

Some furnace problems appear suddenly, while others begin as a small change in comfort or operation. Arrange service if you notice any of these conditions:

• No heat or cold air: The blower runs, but the air does not warm or the home never reaches the thermostat setting.
• The furnace will not start: A thermostat, ignition, electrical, safety-control, or gas-supply problem may be interrupting the cycle.
• Short cycling: The furnace starts and stops repeatedly instead of completing a normal heating cycle.
• Uneven heating: Some rooms remain cold even while the system runs for long periods.
• New noises or odors: Banging, scraping, burning odors, or a gas smell should not be ignored.
• Higher energy use: A sudden change can be related to airflow, controls, worn parts, duct losses, or another condition in the home.

These symptoms can have several causes. A gas furnace repair service should begin with diagnostics and confirmation of the failed component rather than a part selected from the symptom alone.

Gas Furnace Diagnostics and Repair

During a natural gas furnace repair visit, the technician starts with the conditions you have noticed, then checks thermostat response, airflow, electrical controls, ignition sequence, burner operation, and system shutdown. After the cause is found, we explain the recommended repair and any parts involved. The furnace is tested again after approved work is completed.

Ignition and Gas Controls

Older furnaces may use a standing pilot light, while many newer systems use electronic ignition or a hot-surface igniter. A dirty flame sensor, failed igniter, pilot problem, pressure-switch fault, or gas-valve issue can prevent the burners from lighting or staying on. These components are tested as part of the operating sequence.

Airflow, Heating Components, and Safety

A restricted air filter, blower motor problem, thermostat fault, or limit-switch issue can cause weak airflow, cold air, overheating, or short cycling. The heat exchanger and venting system also need inspection when damage or combustion concerns are suspected. If testing confirms a failed serviceable component, our heater parts replacement service explains how component repairs are handled.

If you smell gas, leave the building and contact the gas utility or emergency services from a safe location. Do not operate switches, use a flame, or remain inside while waiting for an HVAC appointment.

Gas Furnace Repair and Replacement Options

A gas furnace with one repairable fault may have years of useful service left. Replacement deserves a closer look when the heat exchanger is damaged, failures keep returning, heating remains uneven, or the proposed work is difficult to justify for the condition of the equipment. We review the diagnosis alongside age, safety, repair history, comfort, and likely future service needs.

A new gas furnace installation should match the home’s heating load rather than simply copy the capacity of the old unit. Proper system sizing also accounts for ductwork, airflow, venting, gas supply, electrical needs, thermostat compatibility, and installation access. Once a furnace is chosen, we remove the old equipment, install the replacement, and test startup, heating, airflow, and shutdown.

Financing is available for eligible projects. Qualifying equipment may include 10-year manufacturer warranty coverage, and Billy Butler Heating and Air Conditioning backs its service with a 100% satisfaction guarantee.

Emergency Furnace Service

Heating failures do not always happen during regular business hours, so 24/7 emergency gas furnace repair is available for urgent residential problems. Emergency service may be appropriate when the furnace will not run during cold weather, repeatedly shuts down, trips a breaker, or produces a burning odor. Smoke, fire, a gas odor, or a carbon monoxide alarm requires emergency or utility help from a safe location before an HVAC visit.

Local Gas Furnace Service Since 1982

Billy Butler Heating and Air Conditioning is family-owned and has served local homeowners since 1982. We work with standing-pilot and electronic-ignition systems, explain the confirmed problem, and discuss repair or replacement based on the condition of the furnace. Appointments are available in Lawrenceville and surrounding Northeast Georgia communities based on the current schedule.

Gas Furnace Service FAQs

How much does gas furnace replacement cost?

Gas furnace replacement cost depends on equipment capacity, efficiency rating, venting, gas and electrical work, thermostat needs, labor, and permits. An in-home assessment is needed before a current estimate can be prepared.

How long should a gas furnace last?

Many gas furnaces remain in service for 15 to 30 years, but installation, sizing, maintenance, airflow, use, and repair history affect lifespan. Frequent breakdowns, unsafe damage, or poor heating may justify reviewing replacement sooner.

Why is my gas furnace blowing cold air?

Cold air can result from an incorrect thermostat setting, restricted filter, ignition failure, dirty flame sensor, limit-switch problem, or overheating shutdown. If basic thermostat and filter checks do not help, the system needs service.

Does a gas furnace have a pilot light?

Some older gas furnaces use a standing pilot light. Many newer systems use electronic ignition or a hot-surface igniter instead. Check the model instructions and do not attempt gas or ignition work when the safe procedure is unclear.

How much does gas furnace repair cost?

The cost depends on the failed part, diagnostic time, system access, and labor. A thermostat or sensor problem differs from an igniter, blower motor, gas valve, control board, or heat-exchanger issue, so the furnace must be tested before an estimate is prepared.

How often should a gas furnace be serviced?

A gas furnace should generally be inspected once each year, preferably before the main heating season. Annual service can check the filter, ignition, burners, flame sensor, blower, thermostat, venting, safety controls, and overall operation.

Should I repair or replace my furnace?

Repair often makes sense when the problem is limited and the furnace is otherwise safe and dependable. Replacement may be a better choice when repairs repeat, a major component fails, or the system no longer heats the home properly.

Why is my gas furnace not turning on?

Check that the thermostat is set to Heat, the filter is not blocked, and the furnace has power. Ignition, flame-sensor, gas-valve, limit-control, or thermostat faults may require professional diagnosis.

Schedule Gas Furnace Service

For a gas furnace that will not heat correctly, call Billy Butler Heating and Air Conditioning at (770) 861-7114 or send an online appointment request for service, replacement, or installation. Emergency service is available 24 hours a day, 7 days a week.