How Much Does Furnace Replacement Cost in the East Bay?

March 17, 2026

6 min read

Furnace replacement in the East Bay typically costs $4,500 to $12,000 depending on efficiency, brand, and installation complexity.

By Energy Solutions — Family-run in Antioch since 1998

Furnace replacement in the East Bay in 2026 typically runs $4,500 to $12,000 installed. Where you land inside that range depends on three things: efficiency rating, system size and staging, and how much your existing ductwork and venting need.

What Drives the Price

Efficiency (AFUE). 80% single-stage: $4,500–$6,500. 96% two-stage or modulating: $7,500–$12,000.
Sizing. A properly load-calculated 60,000 BTU unit costs less than an oversized 100,000 BTU unit and runs more efficiently.
Venting. High-efficiency condensing furnaces need PVC vent runs and a condensate drain — sometimes a full re-vent through the attic or side wall.
Ductwork. Leaky or undersized ducts add $500–$3,000 depending on scope.
Permits and Title 24 testing. Contra Costa and Alameda County both require permits and, on many jobs, HERS duct-leakage testing.

When Replacement Beats Repair

If your furnace is over 15 years old and quoting more than $1,500 in repairs, replacement almost always wins on 5-year cost. Newer systems cut gas use 15–30% versus a 20-year-old 80% furnace.

Frequently Asked Questions

What's the cheapest furnace I can put in?

An 80% AFUE single-stage gas furnace installed runs $4,500–$6,500 for a straightforward swap. It's a fine choice for mild East Bay winters, but you give up efficiency and comfort features.

Are there rebates for a new furnace?

Yes. TECH Clean California, BayREN Home+, and the federal 25C tax credit can knock $1,000–$3,000+ off qualifying high-efficiency systems, especially heat pumps. We file the paperwork for you.

Do I need permits for a furnace replacement in Contra Costa County?

Yes. A mechanical permit is required, and Title 24 duct testing is triggered on many replacements. A licensed contractor pulls the permit — never let a company install without one.

Free In-Home Estimates — Even in July

Family-run HVAC in Antioch since 1998. EPA-certified technicians. BBB-accredited. Authorized Bryant dealer. 10-year manufacturer warranty on every install. We'll come out, look at your system, and tell you straight what's going on — repair, service, or replacement. No pressure, no upsell.

925-778-1335

CA Lic. #1132058

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