Furnace Replacement & Installation in Los Angeles

Home Upgrade Specialist replaces and installs gas furnaces and converts homes from gas heat to electric heat pumps in Los Angeles. HVAC work is performed and coordinated under CSLB #1031989, a C-20 HVAC license held since 2017, serving Los Angeles, Orange, Ventura, Riverside and San Bernardino counties, with project roles and trade responsibility documented in the written scope. Every project starts with an assessment of the furnace, ducts, venting, electrical capacity and permit path, followed by a written estimate.

We review whether a new gas furnace or a heat pump fits your home best, whether the air conditioner should be replaced at the same time, and what the ducts need. If the AC is also aging, a heat pump can replace both with one system.

Repair or replace your furnace?

Replacement is usually the better path when the furnace is older, needs a major repair, or has a heat exchanger, combustion or venting concern. A repair often makes sense when the furnace is relatively young, the problem is a single identified part such as an igniter, flame sensor or control board, and the heat exchanger and venting are in good condition. For diagnosis and repair rather than replacement, see heater and furnace repair in Los Angeles.

Signs it is time to replace your furnace

Decision factor	Repair may fit	Replacement may fit
System age	Younger equipment	Usually 15-plus years
Breakdown history	Rare service calls	Repeated repairs
Comfort	Generally even heating	Hot and cold rooms, weak airflow
Safety	No major concern found	Cracked heat exchanger or venting problems
Cooling	AC in good condition	AC also aging or using R-22

Other signs include a furnace that runs longer than it used to, noisy starts and stops, dusty airflow, rooms that never warm up, and parts that are hard to find. Many Los Angeles furnaces run only part of the year, so age alone does not decide it; condition, safety and repair history matter more. If a technician finds a cracked heat exchanger or a combustion or venting problem, replacement is usually the safer choice.

Gas furnace or heat pump?

Los Angeles winters are mild, which makes a heat pump a strong option for many homes, especially when the air conditioner is also near replacement, because one system heats and cools. A new gas furnace can still be the right choice when the ducts and venting are sound, the AC is relatively new, or you prefer gas heat. Gas furnaces installed in the South Coast air district must meet ultra-low NOx emission limits. We can price both paths in the written estimate.

For a side-by-side look at each system, see air handler vs furnace vs heat pump. If you are leaning toward electrification, the gas furnace to heat pump switch guide covers the conversion steps, and heat pump installation in Los Angeles covers the heat pump service.

Furnace types and locations in Los Angeles homes

Los Angeles homes put furnaces in attics, hall closets, garages and crawlspaces, and the location shapes the replacement. Upflow furnaces sit in closets and garages and push air up into the ducts. Horizontal furnaces lie on their side in attics and crawlspaces, where access, platform condition, clearances and a drain pan matter. Downflow units serve homes with ducts below the floor.

Efficiency also changes the installation. Standard-efficiency furnaces vent through a metal flue. High-efficiency condensing furnaces vent through PVC pipe and need a condensate drain, which can mean new vent routing. In a mild climate, the right efficiency depends on how much you heat, the existing venting and your budget. Wall furnaces and floor furnaces in older homes are a separate category; replacing one with a ducted system or a ductless heat pump is a larger project that we scope separately.

What happens on replacement day

• Protection and shutoff: the crew protects the work area and shuts off gas and power to the old unit.
• Removal: the old furnace, and the coil or AC if they are being replaced, are disconnected and removed.
• Installation: the new furnace or air handler is set, connected to the ducts with fabricated transitions, and connected to gas, venting, drainage and power.
• Testing: gas connections are leak-checked, venting and combustion are verified, and refrigerant equipment is pressure tested, evacuated and commissioned.
• Handoff: we set up the thermostat, show you the filter and explain warranty terms. Permit inspection and any required ECC field verification follow.

What changes furnace replacement cost

We provide a written estimate after reviewing the home rather than quoting a number in advance. The biggest factors are the equipment type and efficiency, where the furnace sits and how easy it is to reach, venting changes, whether the coil or AC is replaced at the same time, duct and electrical work, and permits with any required ECC field verification. For a fuller breakdown of each factor, see furnace replacement cost in Los Angeles.

Compare proposals on the same scope: exact model numbers, what is included, what is an allowance and what is excluded. HVAC financing may be available for qualified homeowners, subject to credit approval and program terms.

Ducts, air handler, permits and ECC field verification

Many furnace complaints are partly duct problems. A replacement estimate should cover duct leakage, return-air sizing, filter access, thermostat compatibility and filtration and indoor air quality, and whether the indoor coil or air handler should be replaced at the same time. For a heat pump conversion, electrical capacity, refrigerant lines, condensate drainage and air handler placement also affect the scope.

Furnace and HVAC replacements in Los Angeles commonly require a permit and final inspection. Depending on the scope, ECC field verification, formerly referred to as HERS testing, may also be required. See the HVAC permits and ECC field verification guide. Installations include pressure testing, evacuation and commissioning where refrigerant equipment is installed.

Before you sign, ask:

• Is the sizing based on a load calculation or only the existing furnace size?
• Will ducts, returns and registers be inspected?
• Who handles permits and required testing?
• Does the proposal cover venting, thermostat, filtration and airflow?
• What warranty terms apply to equipment and labor?

Incentives if you consider a heat pump

If you are weighing a heat pump instead of a new gas furnace, utility incentives may favor qualifying heat pump systems. Eligibility, program terms and funding change, and a rebate is not guaranteed, so confirm current details before relying on one. See our LADWP heat pump rebate guide and heat pump rebate availability; for gas-utility programs, see the SoCalGas rebates 2026 guide. The federal 25C tax credit is not available for equipment placed in service in 2026. Home Upgrade Specialist is not a tax advisor; confirm tax questions with a qualified tax professional.

Example installation scope

One published HUS planning scope pairs a Goodman GR9S800804BUA 80,000-BTU Ultra-Low NOx furnace with a 4-ton R-32 condenser and matched coil, and lists Manual J sizing, duct and return-air review, venting and condensate protection, electrical review, permit responsibility, ECC field verification, startup checks and warranty documentation. It is a model-level example, not a claim that the same system fits every home. See the Goodman installation scope and Los Angeles HVAC project examples.

Furnace replacement FAQ

How much does furnace replacement cost in Los Angeles?

It depends on the furnace or heat pump equipment, its location in the home, venting, ductwork, electrical work, whether the AC is replaced at the same time, and permits. We provide a written estimate after reviewing your home.

Is it worth replacing a 20- or 30-year-old furnace?

Often, yes, especially if it needs a major repair, has a heat exchanger or venting concern, or the AC is also aging. Some older furnaces still run safely, so condition and safety matter more than age alone.

Should I replace my furnace with a heat pump?

In Los Angeles's mild climate, a heat pump is a strong option, particularly if the air conditioner also needs replacement. A new gas furnace may still fit when the ducts, venting and AC are in good shape. We compare both in the estimate.

Do I need a permit to replace a furnace in Los Angeles?

Furnace and HVAC replacements commonly require a permit and final inspection, and some projects require ECC field verification, formerly referred to as HERS testing. Your written scope should state who handles permits.

Can you replace a furnace in an attic or closet?

Yes. Attic, closet, garage and crawlspace furnaces are common in Los Angeles. Access, venting, condensate drainage and clearances affect the equipment choice and the scope.

Are there rebates for switching from gas to a heat pump?

Possibly. Utility programs, including LADWP, may offer rebates for qualifying heat pumps, subject to program rules and available funding, and a rebate is not guaranteed. The federal 25C credit is not available for 2026 installations.