Furnace Repair in Marietta - Fixed Today, No Surprise Invoice

Trusted Furnace Repair for Marietta Homeowners

When your furnace quits on a cold Marietta night, you need a repair team that shows up fast, tells you exactly what’s wrong, and gives you a written price before any work begins. That’s how Brandt HVAC Co Marietta has operated since 2003, and it’s why homeowners across Cobb County call us first when the heat goes out. Our furnace repair technicians in Marietta handle igniters, flame sensors, blower motors, gas valves, and control boards on every major brand, with most jobs completed same-day. Call (478) 662-5175 and a live person answers, day or night.

Call (478) 662-5175

Devin Marlowe leads our Marietta team, and every technician we send to your door arrives background-checked, uniformed, and carrying photo ID under our Threshold Verified standard. Before your appointment, you’ll receive the technician’s name and photo, so you know exactly who to expect. When they arrive, they’ll show their badge at the door. If anyone shows up who you weren’t told to expect, that visit is on us, and we’ll make it right. That certainty matters, especially when you’re home alone or have young kids in the house.

Most Furnace Repair - Marietta jobs run $150 – $700, parts and labor included. You’ll see the written price before we touch a single component, and every repair carries the 365-Day Done Right Promise: if the fix fails within a year, we return at no charge. No argument, no fine print.

Written by Devin Marlowe, Owner at Brandt HVAC Co Marietta, serving Marietta since 2003.

Furnace Maintenance

Furnace Maintenance is scheduled upkeep that prevents the most common mid-winter breakdowns before they happen: clogged burners, cracked heat exchangers, failing igniters, and overheating blower motors. In Marietta’s damp, variable winters, your furnace cycles on and off constantly through November and February, which accelerates wear on electrical connections and airflow components. Brandt HVAC Co Marietta recommends annual maintenance in early fall, before the first cold snap, so problems are caught while they’re still cheap to fix. A scheduled tune-up runs $80 – $200 and includes a 20-point inspection, filter evaluation, and a written report on what we found and what we’d watch.

Seasonal Tune-Up Coverage

We follow the manufacturer’s maintenance schedule for your specific furnace, whether it’s a Trane, Goodman, or Rheem. That means checking gas pressure, testing safety switches, and cleaning the flame sensor so your system starts reliably on the first cold morning.

What the Report Tells You

After every maintenance visit, you get a written summary of your furnace’s condition. We flag worn parts with an estimated remaining lifespan, so you’re never surprised. Our technicians are not paid on what they sell, which means the report reflects what your furnace actually needs, not what pads a commission.

Heat Pump Repair

Heat Pump Repair covers heating failures in systems that move heat rather than burn fuel, and in Marietta these units work year-round, switching between heating and cooling as the seasons shift. When a heat pump runs in winter and blows lukewarm air, the usual suspects are a stuck reversing valve, low refrigerant, a failed defrost control board, or a locked-up compressor. Brandt HVAC Co Marietta diagnoses all of it, and most heat pump heating repairs in Marietta fall between $150 – $700. We service every major heat pump brand, including Lennox, Trane, and Rheem, and we show you the written price before any repair begins.

Defrost and Airflow Diagnostics

A heat pump that ices over in Marietta’s cold rain needs more than a quick scrape. We test the defrost sensor, timer circuit, and outdoor fan operation to find the root cause, not just the symptom. Fixing it right the first time is what the 365-Day Done Right Promise is built on.

Refrigerant and Reversing Valve Service

Refrigerant is the fluid that carries heat from outside your home to inside, and when it’s low, your heat pump strains and your electric bill climbs. We locate the leak, repair it, and recharge to the manufacturer’s exact specification, then verify the reversing valve shifts cleanly between modes.

Heating Repair

Heating Repair is the broad term for fixing any system that warms your Marietta home, whether that’s a gas furnace, an electric air handler, a heat pump, or a hydronic system. When your heat is weak, noisy, short-cycling, or completely dead, the fix might be a $150 igniter, a $300 blower motor, or a $700 control board replacement, depending on your unit and the failure. Brandt HVAC Co Marietta starts every heating repair the same way: we listen, we test, and we hand you a written price before any work starts. That’s true whether we’re working on a Goodman in our Furnace Repair in Powder Springs or a Lennox in a Vinings townhome.

Electrical and Control Board Repairs

Modern furnaces rely on solid-state control boards that fail in ways older units never did: voltage spikes, moisture exposure, and age. We bench-test boards and replace them with OEM or matched-compatible parts, then run a full cycle test to confirm the sequence of operation is correct.

Airflow and Blower Motor Service

Restricted airflow is behind a surprising share of heating failures in Marietta, where ducts run through humid crawlspaces and attics. We inspect filters, plenums, and blower wheels, and when a motor fails, we match the RPM and capacitor specs exactly so your system moves the air it was designed to move.

Boiler Repair

Boiler Repair means fixing hydronic heating systems that circulate hot water through radiators, baseboards, or in-floor tubing. While less common in Marietta than forced-air furnaces, older homes in neighborhoods like Fair Oaks and Austell still rely on boilers, and when they fail, it’s usually a circulator pump, expansion tank, pressure relief valve, or zone valve. Brandt HVAC Co Marietta works on gas and electric boilers, and typical boiler repairs in this market run $150 – $700, depending on the component and accessibility. Every repair is quoted in writing before work begins and covered by our 365-Day Done Right Promise.

Circulator and Zone Valve Diagnostics

When one room stays cold while the rest of the house heats up, a stuck zone valve or failing circulator pump is usually the cause. We test each zone independently, check water pressure and temperature differential across the loop, and replace only what actually failed.

Pressure and Expansion Tank Checks

Boilers in Marietta run against a closed-loop pressure system, and a failed expansion tank can cause the relief valve to leak or the system to lose pressure entirely. We check tank pressure, bleed air from the lines, and verify the fill valve and backflow preventer are working as designed.

Gas Furnace Repair

Gas Furnace Repair covers the combustion-side failures specific to natural gas and propane furnaces: gas valves that stick, burners that won’t light, flame sensors that misread, and heat exchangers that crack. In Marietta, where most homes heat with natural gas from Atlanta Gas Light, these systems run hard from November through March. A flame sensor replacement typically costs $150 – $300, a gas valve runs $250 – $500, and a full repair including multiple components can reach $700. Brandt HVAC Co Marietta always quotes the exact job in writing before work begins, and we never upcharge for parts we don’t actually replace.

Gas Valve and Ignition Testing

We measure gas pressure at the manifold, test the igniter’s amp draw, and verify the flame sensor’s microamp signal, which tells us whether the valve is opening, the igniter is glowing hot enough, and the control board is reading the flame correctly. Gas work demands precision, and that’s what we bring.

Heat Exchanger Inspection

A cracked heat exchanger leaks carbon monoxide into your home. We inspect yours with video-scope equipment during every gas furnace repair, and we show you what we see. If we find a crack, we’ll shut the furnace down and give you honest options, never a hard sell.

Furnace Tune Up

Furnace Tune Up is a flat-price preventive service that takes about 60 to 90 minutes and runs $80 – $200 in Marietta, depending on your furnace’s age and accessibility. During a tune-up, our technician cleans and inspects the key wear components: burners, igniter, flame sensor, blower assembly, condensate drains, and safety switches. We recommend scheduling yours in September or October, before the first real cold front, so your furnace is ready the day you actually need it. A tune-up also catches small leaks and loose electrical connections that become expensive emergency repairs by January.

What the $80 – $200 Covers

The tune-up price includes cleaning, inspection, testing, and a written report. You’ll know the condition of your heat exchanger, the amp draw on your blower motor, and the static pressure across your filter and coil, measured and recorded on the spot.

Why Fall Service Makes Sense

Marietta’s shoulder season is mild, but the first freeze arrives fast. Furnaces that sat unused since March often fail on the first cold start-up, and that’s when repair demand spikes. Getting ahead of that window means faster scheduling and a system that’s already proven it will fire.

Emergency Furnace Repair

Emergency Furnace Repair is for the nights when your furnace quits completely and the temperature inside your Marietta home drops fast. A furnace failure in freezing weather is more than uncomfortable; it puts you, your family, and your pipes at risk. Brandt HVAC Co Marietta answers the phone with a live person 24 hours a day, 7 days a week, including holidays. We prioritize no-heat calls, and our emergency repair pricing follows the same written-quote policy as every other job: you’ll see the price before we start, and typical emergency furnace repairs run $150 – $700 depending on the failed part.

Same-Day and After-Hours Response

Most no-heat calls in Marietta get a technician the same day, often within hours when weather is severe. After-hours and weekend calls are handled by our own background-checked technicians, not a subcontractor, so the same 365-Day Done Right Promise applies every time.

What to Do Before We Arrive

Check your thermostat batteries and make sure the furnace switch is on. If you smell gas, leave the house immediately and call your gas utility first, then call us. Otherwise, our technician will arrive with diagnostic tools and common repair parts on the truck, so most emergency calls are resolved in a single visit.

Brands We Service

Our Marietta technicians service every major residential heating brand, and we keep common OEM parts stocked on our trucks. Trane furnaces, for example, use proprietary control logic that requires specific diagnostic procedures, and our team has worked on hundreds of Trane units across Cobb County. We know their induced draft assemblies, their hot surface igniters, and their 2-stage gas valve configurations inside and out.

Lennox systems have their own quirks, particularly the SLP98 and EL296 series, where flame sensor positioning and airflow calibration matter more than most techs realize. We’ve repaired enough Lennox units in Vinings, Smyrna, and Marietta proper that we can usually pinpoint the failure on the first visit. Goodman and Rheem furnaces round out the most common brands in this market, and we carry their most-failed parts as well. Whether you have a Trane, Lennox, Goodman, Rheem, or any other make, we can help. Our home page has more about how we work.

Signs You Need a Pro Right Now

• Furnace won’t stay lit. A furnace that fires up and shuts down after a few seconds usually has a failing flame sensor or a dirty burner. The system may struggle to stay lit for hours or days, and each failed ignition cycle adds stress to the gas valve and control board.
• Cold air blowing from vents. If your furnace runs but the air feels cool, the burners may not be igniting at all, or the heat exchanger may be blocked. Continuing to run the blower in this state wastes energy and can spread dust throughout your Marietta home.
• Rattling, banging, or screeching. A loud bang on startup often means a delayed ignition, which can crack a heat exchanger over time. A screeching blower motor or grinding inducer fan means bearings are failing, and waiting makes the repair more expensive.
• Yellow flickering flame. The burner flame inside your furnace should burn steady and blue. Yellow or orange flickering indicates incomplete combustion, which produces carbon monoxide and means the burners or heat exchanger need immediate attention.
• Gas smell near the furnace. A faint gas odor when the furnace first starts can be normal, but a persistent or strong gas smell means a leak at a fitting or valve. This is a safety issue. Leave the house and call your utility, then call us.

Our Process, Step by Step

1. 1
   You call, a person answers. Every call to (478) 662-5175 is answered by a live dispatcher, not a phone tree. You’ll tell us what’s happening, and we’ll schedule a visit at a time that works for you, including same-day and after-hours appointments in Marietta.
2. 2
   We send you the technician’s name and photo. Before your appointment, you’ll receive a notification with the technician’s name, photo, and background check confirmation. That’s the Threshold Verified standard at work. You’ll know who’s coming before they ring the bell.
3. 3
   Diagnosis with written pricing. The technician arrives in uniform, shows a photo ID badge, and begins with your description of the problem. They’ll test the system, explain what’s failed in plain language, and hand you a written price for the repair. No work starts until you approve it.
4. 4
   Repair and verification. We complete the repair using matched OEM or approved parts, then run a full heating cycle to verify ignition, airflow, temperature rise, and safety switch operation. Every repair includes a written guarantee stating exactly what’s covered and for how long.
5. 5
   Follow-up and the 365-Day Done Right Promise. If the repair fails within 365 days, we return and make it right at no additional charge, no argument. That’s our promise on every furnace repair we perform in Marietta.

How Much Does Furnace Repair Cost in Marietta?

Our Service Area Near Marietta

Brandt HVAC Co Marietta serves homeowners throughout central Cobb County and the surrounding communities. We’re in Mableton, Acworth, Lithia Springs, Scottdale, Austell, Fair Oaks, Smyrna, Kennesaw, Vinings, Powder Springs, and Woodstock regularly, with most calls reached within an hour or less from our central dispatch in Marietta. If you’re nearby and wondering whether we cover your street, call and ask; the answer is usually yes. See Furnace Repair in Acworth for that service area’s details.

Frequently Asked Questions About Furnace Repair in Marietta

Schedule Your Furnace Repair Service in Marietta Today

When your furnace needs repair in Marietta, you deserve a technician you know by name, a price you see in writing before work starts, and a guarantee that lasts a full year. Call (478) 662-5175 for a free, no-obligation estimate, day or night. A live person answers, and we’ll get you on the schedule fast.

Written by Devin Marlowe, Owner at Brandt HVAC Co Marietta, serving Marietta since 2003.