Furnace Repair
Your furnace stopped working—get reliable repairs fast.
How Experienced Contractors Diagnose Furnace Problems Accurately
Your heating system isn’t producing heat, or it’s running but not warming your home properly. Maybe it won’t ignite, keeps cycling on and off, or is making unusual sounds. When your furnace fails during a Tennessee winter, you need immediate, expert diagnosis and repair. That’s what we deliver.
Our seasoned crew brings decades of combined experience responding to furnace emergencies across Middle Tennessee. We arrive prepared with diagnostic equipment and parts to handle most furnace failures on the same day. Our certified technicians understand the full scope of what can go wrong — from ignition failures and gas valve issues to airflow restrictions and control board problems — and we carry the expertise to diagnose and fix them quickly.
Why Choose Us
Inexperienced technicians replace parts hoping something works. Our approach is methodical: we measure gas pressure, test ignition sequences, check airflow, and verify temperature rise across the heat exchanger. We document findings with actual readings so you understand exactly what failed and why.
We’ve seen how Middle Tennessee’s variable winters—sudden freezes, humidity swings, and unpredictable heating demands—stress furnace components over time. Our technicians recognize patterns and understand how regional climate conditions affect system longevity.
We hold a Tennessee Mechanical (HVAC) and Refrigeration Contractor License, maintain full bonding, and carry a BBB A- rating. If a repair goes wrong, you have recourse. We stand behind our work because we’re confident in our diagnosis and repair execution.
Furnace repairs involve gas connections, electrical controls, and combustion safety. Our technicians are EPA 608-certified, trained on gas safety regulations, and understand the legal requirements for furnace work. Your repair is done to code and documented for safety compliance.
Furnace failures don’t wait for business hours, especially in winter. We offer same-day diagnostic service on most calls and emergency response for urgent situations. When it’s below freezing and your heat is down, we arrive prepared to fix it today.
A 20-year-old furnace needing a major repair might be a candidate for an efficient new system instead. We tell you honestly: repair costs, replacement costs, and annual efficiency savings. You make the decision with full information and true cost comparison.
Free, No-Obligation Estimate
Is your furnace not heating, running constantly without warming your home, or making unusual sounds? Describe what’s happening, and we’ll schedule a diagnostic visit. We’ll test your system, identify the exact problem, explain your repair options and costs upfront, and provide a written estimate before starting any work.
Or explore related heating options:
Our Process
When you call with a heating problem, we ask specific questions: "When did it fail?" "Does the thermostat have power?" "Do you see any error codes?" "Is the blower running?" These details help us understand what’s happening and whether repair needs to happen today. We assess the urgency and, if your home is getting dangerously cold or you have vulnerable family members, we prioritize same-day emergency service.
We also provide temporary heat guidance: close off unused rooms, use space heaters safely (away from curtains and furniture), and seal any drafts around windows and doors. These steps help you stay safe and warm while you wait for our technician.
Our technician arrives with diagnostic tools and replacement parts for common furnace repairs. We visually inspect the furnace for obvious problems: loose gas connections, water damage, visible carbon buildup, or electrical issues. Then we perform systematic testing: measure gas pressure at the burner, test electrical continuity on ignition circuits, check thermostat operation, measure temperature rise across the heat exchanger, and verify that the blower is moving air properly.
We also listen closely to how the furnace operates during ignition and running cycles — the sounds tell us whether everything is working normally. We take photos and document all readings so you have a complete record of what we found.
Once testing is complete, we explain exactly what we found and why your furnace failed. We discuss repair options and costs clearly. For example: "Your flame sensor is carbon-fouled and won’t ignite. Repair option 1: clean the sensor — this fixes most carbon buildup and costs $X. Repair option 2: replace the sensor if cleaning doesn’t work — this is our fallback and costs $Y."
For an aging furnace with major failures (cracked heat exchanger, failed ignition control board), we also discuss replacement as an option: what a new system costs, available financing, and annual efficiency savings.
Once you approve the estimate, we perform the repair to manufacturer and code standards. This might involve replacing a failed igniter, cleaning or replacing a flame sensor, fixing gas connections, repairing electrical wiring, or replacing a control board. After each repair, we run your furnace through a complete test cycle to confirm the problem is resolved and the system operates at design specifications.
We verify ignition sequence, measure temperature rise, check gas pressure, and cycle through multiple heat-on and shutoff sequences to ensure reliability. We document the repair work and efficiency before and after so you see proof of resolution.
Before we leave, we provide a detailed invoice with parts, labor, and what we repaired. We explain any maintenance steps you can do (like changing filters monthly during heating season and keeping vents clear). We recommend our annual furnace maintenance plan to catch minor issues before they become emergency repairs.
Our goal is to resolve today’s problem and help you avoid costly failures down the road.
Prevent Future Furnace Repairs
Once your furnace is repaired, staying on top of maintenance is the key to preventing future breakdowns. A fall tune-up before heating season keeps your system running efficiently, catches minor issues before they become failures, and keeps your warranty valid.
Our maintenance plans make staying on schedule easy — and they offer repair savings if issues ever do arise.
Getting more years out of your investment
Prevention of unexpected breakdowns during peak heating and cooling seasons
A clear, documented record of system condition that informs smart repair and replacement decisions
Improved system efficiency and lower monthly energy bills
Identify any conditions that could pose a hazard to your home or family
Measure how well your system is actually operating under current conditions
Honest, documented assessment of the current state of your equipment
Available to qualifying homeowners through the TVA program
Catch small problems before they become expensive repairs or emergency breakdowns
Financing Your Furnace Repair
Major furnace repairs can be unexpected expenses, but financing options shouldn’t force you to wait for heat. We work with Wells Fargo, TVA Financing, and Synchrony to offer flexible terms that fit a furnace repair into your budget.
There are no gimmicks and no pressure to finance. We discuss financing before you commit, so you can make the best decision for your home.
Straightforward financing through Wells Fargo, with a simple online application.
Contact Us to ApplyAvailable through participating utilities — convenient payments made right on your utility bill.
Contact Us to Check EligibilityFlexible financing through Synchrony to fit quality equipment into your budget.
Contact Us to ApplyReal Savings for Tennessee Homeowners
As a TVA EnergyRight Quality Contractor Network Member, Reliable Comfort Services Inc. can help Middle Tennessee homeowners access real money back through the TVA EnergyRight rebate program. These rebates represent a genuine opportunity to offset the cost of upgrading your system — or maintaining what you have.
Rebates toward high-efficiency HVAC system replacements
Incentives for upgrades that boost overall system efficiency
Rebates for replacing aging or leaking ductwork
Available to qualifying homeowners on annual maintenance
Ask us how to take advantage of what’s available in your area when you schedule service.
Protection You Can Count On
We stand behind our work and the equipment we install. Every new residential install can add an optional labor warranty of up to 10 years through a third-party program, and our LG Pro Dealer status includes a 12-year parts warranty on LG ductless systems — among the strongest coverage available. That’s how confident we are in the quality of our work.
Parts and major components are covered up to 10 years when the equipment is registered. We handle registration and keep your documentation. Coverage varies by equipment.
Available as an option on any residential unit we install, through a third-party program. If selected, it covers repair labor for up to 10 years — you choose whether to add it.
Included on LG ductless installations through our LG Pro Dealer status — one of the strongest coverage packages available. Applies to LG ductless equipment only.
Available on qualifying, select equipment only — if a major component such as the compressor or coil fails within the coverage period, the unit is replaced rather than repaired.
Customer Reviews
We provide furnace repair service throughout the broader Middle Tennessee region. Contact us to confirm repair availability in your area — we’re always glad to help a neighbor stay warm.
Furnace Repair Service Areas
We respond to furnace emergencies and repair requests throughout Middle Tennessee. From quick diagnostics to emergency heating restoration, homeowners across the region count on us for reliable furnace repair service.
Answering Your Questions
Faulty ignition is the most common repair — either a failed igniter or a carbon-fouled flame sensor. These repairs restore full heating function immediately, and we provide a written estimate before any work. The second most common is dirty filters or airflow restrictions, often preventable with basic maintenance.
Repair cost depends on the specific failure and the parts involved — a sensor cleaning is far less involved than a heat exchanger replacement. The most common repairs involve the igniter, flame sensor, or gas valve. We provide a written estimate before any work so you know the exact cost.
Furnace repair is dangerous for untrained individuals. Gas connections, electrical circuits, and combustion safety require licensed, trained technicians. Improper repairs can cause gas leaks, carbon monoxide risks, or electrical fires. Always call a licensed technician.
Natural gas has a rotten egg odor added by the utility. If you smell this smell from your furnace or vents, stop using the system immediately and call us. Gas leaks are a serious safety issue requiring immediate attention.
A cracked heat exchanger allows combustion gases, including carbon monoxide, to enter your living space — a serious safety hazard. If we find a crack, we discuss repair (if small) or replacement (if structural). This is not something to defer.
Generally, if your furnace is over 15 years old and repair costs more than 50% of a new system’s price, replacement is usually smarter. For major failures (heat exchanger, control board) on older systems, we discuss both options and let you decide.
If you suspect a gas leak (rotten egg smell) or carbon monoxide, do not use the furnace — leave it off until we inspect. For other issues, it’s safe to leave off until we arrive. We offer same-day service for urgent situations.
Causes include a cracked heat exchanger, failed thermostat, blocked ducts, or blower failure. We test each during diagnosis to find the exact cause. This requires professional diagnosis to identify safely.
Yes. We offer same-day and emergency service for furnace failures during heating season. Call us when your furnace fails — we offer same-day and emergency service, with weekend service available. For urgent situations, we’ll advise on temporary heating and provide a timeline for arrival.
Common warning signs include: won’t start or ignite, runs but produces little heat, loud banging or squealing noises, cycles on and off constantly, strange burning or gas smells, and sudden spikes in heating bills. Any of these symptoms warrant professional diagnosis.
Most common repairs (igniter, flame sensor, thermostat) take 1-3 hours. More complex repairs (heat exchanger, control board, gas valve) may take half a day. We provide time estimates during diagnosis and keep you informed throughout the repair process.
We stock common parts for major brands (Carrier, Trane, Lennox, Goodman, Rheem, York) and can source specialty parts quickly. For older or uncommon brands, we may need to order parts, but we’ll provide temporary heating solutions while we wait for delivery.
Related Services
Keep your furnace and overall home comfort operating reliably year-round.
If your furnace has reached the end of its life, explore efficient new heating systems with flexible financing options.
Explore Furnace InstallationPrevent repairs and extend furnace life with annual fall maintenance and seasonal tune-ups.
Explore Furnace MaintenanceNeed both heating and cooling? Our heat pump experts handle repairs and seasonal maintenance.
Explore Heat Pump RepairImprove heating efficiency and indoor air quality with advanced filtration, UV purification, and humidity control.
Explore Indoor Air QualityWhen summer arrives, we also provide comprehensive central air conditioning repair and maintenance services.
Explore AC Repair
Ready When You Are
When your furnace fails, you need a company that diagnoses accurately, repairs quickly, and stands behind the work. Our seasoned crew brings decades of combined experience solving furnace emergencies across Middle Tennessee. We arrive prepared with diagnostic equipment and parts, we test systematically, and we explain what we find before starting any work.
Our technicians are licensed, bonded, and trained on all major furnace brands and models. We offer same-day diagnostic service and emergency response when your heating system fails. We’re honest about what can be repaired affordably and when replacement is the smarter long-term choice.
Join our maintenance plan for annual fall furnace tune-ups or explore financing options if you’re considering a new furnace.