Furnace Repair & Service in Greater Houston

Our technician arrives and begins with a comprehensive visual inspection:

• Furnace condition — We look for rust, corrosion, moisture stains, and visible damage to the cabinet, heat exchanger, and burner assembly.
• Gas connections — We visually inspect all gas line connections for corrosion, damage, or loose fittings.
• Venting — We check the exhaust vent for blockages, cracks, or improper installation. A blocked vent is dangerous—hot gases back up into your home.
• Filter condition — We check the air filter. A clogged filter restricts airflow and causes weak heat, short-cycling, and accelerated dirt accumulation on the heat exchanger.
• Blower assembly — We verify the blower compartment is accessible and clean.

If we notice safety hazards (gas smell, visible cracks, improper venting), we stop further diagnosis and address the safety issue immediately.

We test the thermostat to confirm it’s reading room temperature correctly and sending a call-for-heat signal to the furnace. We verify the wiring between thermostat and furnace is intact. If the thermostat is calling for heat but the furnace isn’t responding, we move to the furnace control board and safety switches.

If the thermostat is reading incorrectly or won’t call for heat, replacement or reprogramming solves the problem.

We connect a manometer (pressure gauge) to the gas line at the furnace inlet and measure gas pressure. Natural gas furnaces typically operate at 3.5–4 inches of water column pressure. If pressure is too low (utility company issue, regulator failure) or too high (gas control valve problem), we diagnose the cause.

If gas pressure is correct, we observe the burner ignition. Does the pilot light? Does the main burner ignite smoothly when called? Is the flame blue (indicating complete combustion) or orange/yellow (indicating incomplete combustion or air supply issue)? Flame color tells us whether combustion is efficient and safe.

The heat exchanger is the critical component—it transfers heat from burning gas into the air that warms your home. A cracked heat exchanger is dangerous (products of combustion leak into your home air) and expensive to repair.

We visually inspect the heat exchanger for visible cracks, holes, or severe corrosion. If we suspect a crack but don’t see one visually, we may perform a draft test or smoke test to confirm airflow integrity. A cracked exchanger requires replacement—it can’t be patched safely.

If the exchanger looks intact, we verify that warm air is flowing from it into your ductwork. If heat isn’t transferring, the problem may be internal blockage (rust, debris) or a pinhole leak we can’t see visually. We discuss repair options.

We verify the blower motor starts when the furnace is called for heat and that warm air flows through your ductwork. We check for:

• Blower bearing noise — A squealing or grinding blower indicates bearing wear and may require motor replacement.
• Airflow through ducts — We feel warm air at return and supply vents. Weak airflow may indicate a clogged filter, blocked ducts, or failing blower motor.
• System balance — Warm air should reach all areas of your home. Uneven heating suggests duct blockages or damper issues.

Poor airflow dramatically reduces furnace efficiency and heating comfort. We address it during repair.

Furnaces have safety switches designed to prevent dangerous operation:

• Limit switch — Shuts off the burner if the furnace gets too hot (protecting against overheating and fire risk). If this switch is stuck in the open position, the furnace won’t heat because the burner keeps shutting off.
• Rollout switch — Detects flames escaping outside the combustion chamber and shuts down the furnace (indicating a venting or heat exchanger problem). A tripped rollout switch signals danger and requires diagnosis.

We test these switches to confirm they’re functioning and not causing false shutdowns.

Modern furnaces use electronic ignition (hot surface igniter or spark ignition) instead of a standing pilot light. These systems are precise but can fail:

• Hot surface igniter — We test whether the igniter glows when called. If not, it’s usually the igniter element itself (replaceable) or the control board (more complex).
• Spark ignition system — We verify spark is present when the furnace is called. Failed spark ignition requires diagnosis of the ignition module or gas control valve.

Ignition system repairs are common and usually straightforward.

Once testing is complete, we explain findings clearly: “Your furnace isn’t igniting because the hot surface igniter has failed. The igniter glows when the control board calls for it, but it’s not hot enough to light the burner. Replacement cost is [amount]. All other components—gas pressure, blower, heat exchanger, safety switches—are functioning normally. Once we replace the igniter and verify ignition, your heating will be fully restored.”

We answer questions and don’t pressure you to approve immediately. You can ask about alternatives (repair vs. replacement, financing options) before deciding.

Once approved, we proceed with repair, which may include:

• Igniter or spark module replacement — Quick swap, verify ignition restarts, test flame quality.
• Gas valve or control board replacement — Requires careful testing to confirm proper operation.
• Thermostat repair or replacement — Replace with equivalent or upgrade to programmable/smart thermostat.
• Blower motor replacement — Requires electrical work and reinstallation in the furnace.
• Heat exchanger replacement — Major repair, requires careful disassembly and reassembly, pressure-testing to ensure no leaks.

All work follows local code and manufacturer standards.

After repair is complete, safety testing is mandatory:

• Carbon monoxide test — We place CO monitors near the furnace and throughout your home, run the furnace under load, and verify no CO is present. This is non-negotiable—CO poisoning is a serious health hazard.
• Gas leak detection — We use a sensitive gas detector to inspect all gas line connections and the gas valve. Any leak is addressed immediately.
• Venting verification — We confirm that furnace exhaust vents safely to the outside and doesn’t backdraft into your living space.

Before we leave, we explain the repair and what caused the failure. We discuss maintenance practices that prevent recurrence: annual tune-ups, filter changes, and when to call for service. We provide:

• Equipment documentation
• Repair warranty information
• Maintenance plan options
• Carbon monoxide test results

We also recommend annual furnace maintenance to catch wear before failures occur—especially important as furnaces age.