Cost Guide
How Much Does Furnace Replacement Cost?
The average cost of furnace replacement in Los Angeles & Orange County ranges from $3,800 to $12,000, depending on the required ultra-low-NOx equipment class and ductwork and venting condition.
Cost guide · Last reviewed
Quick Answer
The average cost of furnace replacement in Los Angeles & Orange County ranges from $3,800 to $12,000, depending on the required ultra-low-NOx equipment class and ductwork and venting condition. One local rule sets the floor: every gas furnace installed in our air district must meet SCAQMD Rule 1111's ultra-low-NOx limit — the cheap furnace price you found online is often for a model that's illegal to install here. Permits plus Title 24 HERS testing apply to most change-outs.
Range source: published Los Angeles & Orange County figures compiled from Angi, HomeAdvisor, and regional cost guides (2026) — the same data behind our interactive pricing explorer. Your exact price depends on your home; estimates are free and quoted in writing.
What does furnace replacement cost in LA & Orange County?
Furnace pricing in Los Angeles & Orange County starts from a rule most cost guides ignore: our entire service area sits inside the South Coast AQMD, where Rule 1111 caps furnace NOx emissions at 14 nanograms per joule. Non-compliant models are illegal to sell or install here — so the national "average furnace price" is frequently quoting equipment you cannot legally buy at your address.
The published LA/OC range for a gas furnace replacement is $3,800–$12,000 (compiled from Angi, HomeAdvisor, and regional 2026 cost guides — the same data on our pricing page). Where you land depends on the AFUE efficiency tier, attic vs. closet access (SoCal builders put most furnaces in the attic), venting condition, and the permit + Title 24 HERS testing that most change-outs trigger. Pairing the furnace with an AC moves the project to the published full-system range of $8,000–$25,000+. If a number you got online looks far below all of this, our AI cost-estimate guide explains what that number is missing — and the second opinion on it is free.
What are your good, better, and best options?
| Option | What it is | Published range | Worth knowing |
|---|---|---|---|
| Good — like-for-like ultra-low-NOx replacement | Standard-efficiency Rule 1111-compliant furnace on sound ducts and venting | $3,800–$12,000 (lower end of the published range) | Permit + HERS testing still apply to most change-outs |
| Better — 97%+ AFUE condensing furnace | Top-efficiency tier with condensate management — the strongest gas-rebate position | $3,800–$12,000 (upper end of the published range) | SoCalGas pays up to ~$2,000 at 97%+ AFUE (C-20 contractor install required) |
| Best — furnace + AC full system | Both sides replaced at once — one crew, one permit package, matched equipment | $8,000–$25,000+ (published full-system range) | The published top end includes new ductwork |
Published third-party LA/OC market ranges — not a Power Pro price list. Your written quote is exact and free, names the exact AFUE tier and its rebate value, and itemizes permit + HERS lines before work begins.
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What factors affect furnace replacement prices?
| Cost factor | Why it moves the price | Typical impact |
|---|---|---|
| SCAQMD Rule 1111 compliance | Only ultra-low-NOx (14 ng/J) models are legal in the South Coast air district | Sets the equipment floor — that's the law, not an upsell |
| AFUE efficiency tier | 80% vs 97%+ condensing changes equipment cost, venting, and condensate scope | 97%+ AFUE unlocks the top SoCalGas rebate (~$2,000 typical top tier) |
| Attic access & location | SoCal furnaces mostly live in attics — tight access adds labor hours | Labor moves with access |
| Permit + Title 24 HERS testing | Mechanical permit plus independent duct-leakage/airflow testing on most change-outs | LADBS all-in commonly $250–$1,000 — itemized in our quotes |
| Ductwork & venting condition | Corroded flues or leaky ducts must be corrected with the new unit | Heavy duct work moves you toward the full-system range |
How do rebates change the math?
The gas-side money here is SoCalGas's furnace rebate: tiered by AFUE and paid per kBtuh — the top tier (97%+ AFUE) works out to roughly $2,000 on a typical 80,000 BTU furnace, one per household, installed by a licensed C-20 contractor. Territory catch: Long Beach runs municipal gas, so SoCalGas rebates don't apply there. Federal 25C/25D credits expired for 2026 installs, and TECH/HEEHRA are closed or fully reserved — never budget around them. If you're replacing a furnace anyway, the heat-pump path ($9,000–$18,000 published, with SCE/APU electric-side incentives) deserves a side-by-side look: our comparison guide runs it honestly, and the rebates guide lists every live program.
Is furnace replacement priced differently in your city?
Where the answer genuinely changes — a municipal utility that voids a rebate, a documented permit regime, a housing stock that moves the scope — we've written the local version. Where it doesn't, this guide is the answer everywhere we serve.
About this cost guide
Written and reviewed by the Power Pro Plumbing, Heating & Air team under the pricing standard set by founder Raul Rodriguez — four decades in the trades, serving Los Angeles & Orange County from Cerritos, Gardena, and Anaheim for 20+ years (hear him on The Catalyst for the Trades). CSLB License #766254 — verify it at cslb.ca.gov. Every dollar figure on this page is a published LA/OC market range or a verified program amount, never an invented Power Pro price list; quotes are exact, free, and in writing. Last reviewed .
Common questions
Why can't I install the cheap furnace I found online in Los Angeles?
SCAQMD Rule 1111. Every gas fan-type central furnace installed in the South Coast air district must meet an ultra-low-NOx limit of 14 nanograms per joule — non-compliant models are illegal to sell or install here. Out-of-area internet prices are usually quoting equipment that can't legally go in at your address.
What does a furnace replacement cost in LA and Orange County?
The published range is $3,800–$12,000 for a gas furnace replacement, driven by AFUE tier, attic access, venting condition, and the mechanical permit plus Title 24 HERS testing most change-outs trigger. A furnace + AC full system runs $8,000–$25,000+ published. Your exact number comes from a free written estimate.
Is the 97% AFUE furnace worth the premium?
Often, for two reasons: gas savings every month, and SoCalGas's AFUE-tiered rebate — the 97%+ tier works out to roughly $2,000 on a typical furnace, which closes much of the gap to a standard-efficiency unit (in SoCalGas territory; Long Beach's municipal gas utility doesn't offer it). We quote both tiers with the rebate math in writing.
Should I consider a heat pump instead of another gas furnace?
In our mild winters it's a genuine option: one system heats and cools, published ducted heat-pump installs run $9,000–$18,000 before incentives, and the 2026 utility money (SCE instant discounts, APU's $200/ton in Anaheim, LADWP in the City of LA) sits on the electric side. Our heat-pump-vs-furnace guide compares them honestly — no agenda either way.
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Furnace Replacement — priced honestly, in writing.
The published range is $3,800–$12,000. Your number is exact: free estimate, upfront pricing, price match guarantee, and a free second opinion on any quote you already have.
