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HVAC Services

Wall Furnace Repair & Installation in Norwalk & La Mirada, CA

Repair and installation of gas wall furnaces and wall heaters throughout the Norwalk and La Mirada area.

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Gas wall furnace installation and repair in Norwalk CA

Professional Wall Furnace Repair & Installation in Norwalk & La Mirada

Wall furnaces are a common heating solution in older Norwalk and La Mirada homes, particularly in apartments, condos, and smaller single-family residences built in the 1950s through 1970s. These direct-vent or gravity-vented gas heaters are simple, space-efficient, and reliable when properly maintained — but they do require periodic service to operate safely and efficiently.

We repair and install wall furnaces from brands like Comfort Glow, Empire, Williams, and Vanguard. Common repairs include thermocouple and thermopile replacement (the most frequent failure), pilot assembly cleaning or replacement, gas valve service, burner cleaning, and vent inspection. For units that are beyond repair or no longer available in parts, we handle complete wall furnace replacement including any required gas line modifications.

Safety is particularly important with wall furnaces because many older models are not sealed-combustion units — they draw combustion air from the room. We check for proper venting and oxygen depletion on every service call.

Our Wall Furnace Repair & Installation Process

1

Safety Inspection & Venting Check

We inspect the vent connector, check for proper draft, test for CO at the unit and in the room, and verify the pilot and main burner operate with clean, stable flames.

2

Thermocouple & Pilot Service

The thermocouple is the safety device that keeps the gas valve open when the pilot is lit. We test thermocouple output voltage, clean the pilot orifice, and replace the thermocouple if output is below manufacturer spec (typically 18–25 mV).

3

Burner & Gas Valve Testing

We clean the main burner ports, test gas valve operation, check manifold pressure, and verify proper flame pattern across all burner ports.

4

New Installation

For replacement installs, we remove the old unit, cap or repipe the gas connection as needed, install the new wall furnace, connect gas, test for leaks, light and test the unit, and verify proper venting.

We serve Norwalk, La Mirada, and 20 surrounding Southern California cities. Learn more about all our HVAC services or call 562-219-4085 for same-day service.

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No trip fees, no hidden charges. Our licensed technicians provide upfront pricing before any work begins.

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Same-day service available · Family-owned since 1958

Common Questions

Frequently Asked Questions About Wall Furnace Repair & Installation

A failing thermocouple is the most common reason. The thermocouple is a heat-sensing safety device — when it wears out, it tells the gas valve to close even when the pilot is lit. Thermocouple replacement is a quick, inexpensive repair.

Thermocouple replacement: $85–$150. Pilot assembly replacement: $150–$250. Gas valve replacement: $250–$400. We provide upfront pricing before work begins.

Yes, when properly maintained and vented. We recommend annual inspection of the vent, pilot, and thermocouple. Wall furnaces should never be used as the sole heat source in a sealed room without proper ventilation.

In most cases yes. We verify the existing gas line size and venting are adequate for the new unit. If the old vent is deteriorated, we replace that as part of the installation.

Yes. Many older wall furnaces operate on millivolt systems with no external electrical connection — the thermocouple generates the small current that powers the gas valve. We're experienced with these systems.

Schedule Your Wall Furnace Service Today

Licensed, insured, and trusted by Norwalk and La Mirada homeowners for over 68 years. Same-day service available.