Masonry repair
Sweep & inspection
Caps & crowns
Flue relining
Gas fireplace serviceLevel 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
Fast, Reliable Gas Fireplace Repair Across San Marcos
If your gas fireplace won’t light, produces weak flames, or smells strange when you run it, the issue usually sits in the venting, gas valve, or thermocouple, and the fix runs roughly $150 to $400 for common repairs in San Marcos. We serve every San Marcos neighborhood, from the historic districts near Downtown to the ranch-style streets east of I-35. Call (361) 603-5116 and a live person answers, day or night, to book a technician who arrives in a tracked window with a written price before any work begins.
We know San Marcos gas fireplaces because we’ve worked on hundreds of them, from original masonry hearths in 1940s bungalows off LBJ Drive to prefabricated units in newer subdivisions near McCarty Lane. Cory Mitchell leads our service team, and he’s particular about one thing: you see the problem on camera before you pay a dollar to fix it.
Why Hadley Chimney Austin Is San Marcos’s Preferred Gas Fireplace Repair Company
Founded in 2003, Hadley Chimney Austin has spent two decades inside chimneys across Central Texas, and San Marcos keeps our techs busy with homes that blend aging masonry with modern gas appliances. Our techs know the east-side clay tile flue problem better than any crew working the I-35 corridor. When a San Marcos homeowner calls about a gas fireplace that keeps tripping the carbon monoxide detector, we don’t guess. We run a camera up the flue and show you exactly what’s happening.
The Relay Visibility Guarantee backs every visit. You get live arrival tracking, before-and-after photos, and a written price before the tech picks up a tool. That’s not a promotion. It’s how we’ve always worked. Every repair includes a written guarantee and a free second visit if the repair fails within 365 days, what we call our 365-Day Done Right Promise.
San Marcos homeowners tell us the same thing: other companies gave vague windows, then pushed liner replacements without showing proof. We handle it differently. Our background-checked, uniformed technicians arrive when we say, document what they find, and never recommend a repair you can’t see for yourself on screen. That’s why rental property managers from Willow Creek to Blanco Vista call us for lease-required inspections.
Styles & brands we work with
Our Gas Fireplace Repair Services in San Marcos
Gas Fireplace Diagnostics and Repair
Most gas fireplace failures in San Marcos come down to four things: a failed thermocouple, a dirty pilot assembly, a blocked vent, or a gas valve that’s lost its calibration. We test each one in order, show you the failed component, and quote the replacement price before we turn a wrench. Typical diagnostic visits run $89 to $129, and that fee applies toward any repair you approve.
DuraFlex Flue Relining for Gas Fireplaces
On San Marcos’s east side, we regularly see 1960s ranchers with original clay tile flue liners that were never meant to handle gas appliance venting. Gas burns cooler than wood, but the exhaust produces acidic condensation that eats away at old mortar and tile. When a clay liner cracks under thermal stress, we install a DuraFlex stainless steel relining system sized for your fireplace and gas log set. Relining typically runs $1,800 to $3,400 in San Marcos depending on flue length and accessibility.
HeatShield Smoke Chamber Repair
The smoke chamber sits above your firebox and funnels exhaust into the flue. In San Marcos homes with transitional gas fireplaces, leftover creosote from previous wood burning coats the chamber walls and creates a fire hazard even with gas logs. We clean and inspect first, then apply HeatShield ceramic repair compound to seal cracks and gaps. This runs $800 to $1,600 for most San Marcos homes, and you’ll see the cracked chamber on camera before we recommend it.
Custom Chimney Cap and Damper Installation
San Marcos gets humid summers and occasional hard rains, and a missing or rusted chimney cap lets moisture soak into your flue and damper. We install custom caps from Olympia Chimney and Copperfield that fit your specific flue size, plus top-sealing dampers that keep conditioned air from escaping your home when the fireplace isn’t running. Caps typically run $350 to $700 installed; dampers run $450 to $900 in the San Marcos market.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Marcos
We stock parts for the gas fireplace brands San Marcos homes actually have: Heatilator, Heat & Glo, Majestic, Monessen, Napoleon, and Superior, among others. Our technicians work with DuraFlex flexible liner systems, HeatShield ceramic repair compound, and Gelco chimney products because these are the materials chimney pros rely on for longevity. If you live in San Marcos and your gas fireplace brand isn’t listed, call anyway. We service most major manufacturers and many discontinued models still sitting in older San Marcos living rooms.
See the difference
Before
After
Before
After
Before
AfterCommon Gas Fireplace Repair Problems We See in San Marcos Homes
- Cracked clay tile flue liners on east-side homes. Homes built in the 1960s and 1970s along East Hopkins Street, Riverside Drive, and nearby streets commonly have original clay tile liners that crack after years of thermal stress from occasional hot fires. When a gas log set vents into a cracked liner, carbon monoxide can seep into wall cavities before your detector ever alarms.
- Gas appliances vented into unlined masonry chimneys. Many older San Marcos homes were built with fireplaces meant for wood, then later converted to gas. Gas exhaust creates acidic condensation that eats mortar joints from the inside out, spalling brick and narrowing the flue. A camera inspection shows this damage before it becomes a chimney fire or CO risk.
- Rental property compliance inspections pushed to lease turnover. San Marcos is a college and rental town, and property managers frequently defer chimney inspections until a tenant moves out. That means gas fireplaces with blocked flues or rusted dampers operate unsafely for months. We work with property owners near Texas State and throughout San Marcos to complete lease-required Level 2 inspections quickly.
- Musty odors from humid climate chimney condensation. San Marcos’s humid subtropical climate means moisture sits inside your flue for most of the year. That moisture combines with soot and creosote residue to produce a musty smell that surfaces when your AC runs and pulls air through the chimney chase. A cheap sweep won’t fix it; fixing the moisture entry point and sealing the flue will.
Pricing for Gas Fireplace Repair in San Marcos, TX
Here’s what San Marcos homeowners can expect to pay, based on the jobs we complete across the city each month. Diagnostics run $89 to $129. Common repairs like thermocouple replacement or pilot assembly cleaning run $150 to $400. HeatShield smoke chamber repair runs $800 to $1,600. DuraFlex flue relining runs $1,800 to $3,400. Custom caps run $350 to $700, dampers $450 to $900.
What affects the price: flue length, roof pitch, access to the firebox, and whether previous work left damage that needs correcting. We give you a written price before work starts, every single time. Call (361) 603-5116 for a free estimate on your San Marcos gas fireplace repair.
We Also Serve Cities Near San Marcos
Our techs cover a service radius around San Marcos that includes Gas Fireplace Repair work in Lockhart, Buda, Austin, and Manor. Scheduling and dispatch are coordinated from our Austin office, but crews serve San Marcos locally with the same tracked arrival windows and photo documentation on every visit.
Serving San Marcos, TX - Our Local Coverage Area
We’re based in the San Marcos area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs – Gas Fireplace Repair in San Marcos
Because sporadic use is exactly what makes San Marcos gas fireplaces dangerous. Mild winters mean your fireplace sits dormant for months at a stretch, which lets creosote from previous wood burning harden into a glaze that clings to flue walls. That hardened glaze restricts airflow and traps exhaust. Annual inspections also catch cracked clay tile liners on east-side homes before carbon monoxide becomes a problem. Call (361) 603-5116 to schedule an inspection and get camera documentation of your flue’s condition.
You don’t, until a camera shows you the inside of the flue. Clay tile liners on 1960s and 1970s east-side homes crack under thermal stress from occasional hot fires after long disuse, and those cracks are invisible from the firebox or roof without a scope. If your home still has its original liner and you’re running a gas insert, we recommend a Level 2 inspection before next season. We’ll show you the footage on site, and if the liner is compromised, we’ll quote a DuraFlex stainless steel relining system with a written price before you decide anything.
No. This is the rule Cory Mitchell runs every San Marcos job by: if we recommend a repair, you see the damage on camera first. That applies to liner replacements, smoke chamber work, damper fixes, everything. The chimney trade has too many stories of upsell pressure with nothing to back it up. We hand you the evidence and let you decide. If a crack is cosmetic and the flue is safe to use, we’ll tell you that too.
For a gas fireplace in a rental property, most San Marcos lease agreements and insurance policies require a Level 2 chimney inspection, which includes a camera scan of the entire flue interior. That inspection documents blockages, cracked liners, and clearance issues. We complete Level 2 inspections for rental property owners throughout San Marcos, including near Texas State and the neighborhoods east of I-35, and we provide the photo documentation your lease or insurer will ask for. Call (361) 603-5116 to book a rental inspection with a written price up front.
Yes, and it’s a humidity problem specific to climates like San Marcos. Moisture enters the flue through a damaged cap or cracked crown, mixes with soot and creosote residue, and creates a musty smell that your AC pulls through the chimney chase when the air handler runs. The fix usually starts with a chimney cap replacement and a flue sealing, not a sweep alone. We’ll inspect the moisture entry point with a camera and quote the repair in writing before we start.
If your gas fireplace in San Marcos is acting up, or you just want a camera inspection before the next cold snap, call Hadley Chimney Austin at (361) 603-5116. A live person answers 24/7, the visit includes a written price before work begins, and every repair carries our 365-Day Done Right Promise. We’re proud to serve San Marcos homeowners and property managers with transparent, documented chimney and gas fireplace service.
Written by Cory Mitchell, Owner at Hadley Chimney Austin, serving San Marcos since 2003.