How Much Does Furnace Replacement Cost in the Bay Area?

Aarvaks furnace installation starts at $7,500. That covers removing the old furnace, installing a new Carrier or Bosch gas furnace, connecting it to your gas line and ductwork, setting up the thermostat and testing the system for safe operation. Most replacements are finished the same day.

The starting price is for a standard replacement. Your written quote can be higher when the home needs more than a swap, and every addition is listed on it separately.

What Raises the Price of a Furnace Replacement

• Efficiency and staging. We install 80% AFUE furnaces and high-efficiency models up to 98% AFUE, in single-stage, two-stage and variable-speed versions. Higher efficiency and variable speed cost more upfront and use less gas.
• Ductwork. Crushed, leaking or asbestos-wrapped ducts may need sealing or replacement. We inspect them at every estimate. See ductwork replacement.
• Venting and gas lines. A high-efficiency furnace vents differently from an older 80% unit, and some homes need a larger gas line.
• Location. Attic, crawl-space and closet installs differ in labor.
• Permits. Installation pricing does not include permit fees. Where a permit is required, we apply for it.

Should You Replace the Furnace With a Heat Pump Instead?

A heat pump replaces both your furnace and your air conditioner with one electric system. Aarvaks heat pump installation starts at $17,000 for a single zone, which is more than a furnace alone. If your AC is also near the end of its life, compare the heat pump against the cost of a new furnace plus a new AC. The Bay Area Air District also adopted a zero-NOx standard for new residential furnaces starting in 2029; read what the 2029 furnace rule means.

Warranty and Financing

New installations carry a 10-year limited parts warranty and a 3-year labor warranty, extended to 5 years with an annual maintenance plan. Financing is available through Wisetack from $500 to $25,000; see financing.

How to Read a Furnace Quote

A good quote names the exact furnace model, its efficiency rating (AFUE) and whether it is single-stage, two-stage or variable-speed. It lists every line beyond the furnace itself: ductwork, venting, gas line, thermostat, permit and disposal. If two quotes differ by thousands of dollars, compare those lines first; the gap is usually in scope, not the furnace.

• Is the furnace sized from a load calculation, or copied from the old unit?
• Is the old furnace removal included?
• Are duct repairs, venting changes and gas line work listed?
• What do the parts and labor warranties cover, and for how long?

80% vs. 96%+ AFUE

AFUE is the share of the gas that becomes heat in your home. An 80% furnace turns 80 cents of every gas dollar into heat; a 96% model turns 96 cents into heat. High-efficiency furnaces cost more and vent through plastic pipe with a condensate drain, which can change the install. In a mild Bay Area climate the savings take longer to add up than in a cold one, so the right choice depends on how much you heat.

Ready for a number for your home? Book an in-home estimate and get a written quote, or read about our furnace installation service.