New Gas Furnace Installation in Los Angeles

New gas furnace installation in Los Angeles costs $3,500 to $7,500 in 2026 depending on AFUE rating, BTU sizing, and whether the install requires gas-line work or new venting. This page is for first-time furnace installs — new construction, ADUs, additions, or homes converting from electric baseboard or wall heaters. EA Mechanical handles sizing, gas-line tap, venting, and combustion safety as a single project. Call (818) 988-9060.

First-time furnace installs differ from replacements in two big ways: there is rarely existing venting and the gas line often needs a tap or upsize. We coordinate the gas-meter upgrade with SoCalGas when total BTU demand exceeds the existing meter's capacity. Most projects close in 3 to 7 working days from contract signing.

We install across Tujunga, Sunland, La Crescenta, Burbank, Glendale, Pasadena, and the wider San Fernando Valley. For all-electric homes and homeowners on the LADWP rebate stack, a heat pump is often a better fit than a gas furnace — see the Heat Pumps page or read /blog/heat-pump-installation-cost-los-angeles-2026/ before committing to gas.

What a New Furnace Install Includes

• BTU load calculation — sizes the furnace to the actual heat-loss number for your home, not square-footage shorthand. Oversized furnaces short-cycle and waste fuel.
• Gas line tap and pressure check — black iron or CSST run from the meter to the furnace, leak-tested before commissioning.
• Combustion venting — Category I (atmospheric, B-vent) for non-condensing 80% AFUE units; PVC sidewall venting for condensing 90%+ AFUE units. Big install difference.
• Combustion air supply — code requires sufficient make-up air for the burner. We size and document the supply per the California Mechanical Code.
• City permits and combustion safety test — Title 24 requires both. CO testing with a calibrated combustion analyzer is performed at commissioning.

Condensing vs Non-Condensing — The Real Difference

Non-condensing furnaces (80% AFUE) vent through traditional B-vent (round metal flue) and cost less to install but waste 20 percent of the gas you pay for. Condensing furnaces (90%+ AFUE, up to 96.7 percent) extract additional heat by condensing flue moisture, vent through inexpensive PVC out a sidewall, but require a condensate drain run and slightly more careful install. For a Valley home that runs the furnace 4 to 6 months a year, condensing pays back the install premium in 4 to 6 heating seasons.

BTU Sizing: The Wrong Size Wastes Money Twice

An oversized furnace heats the air to setpoint quickly, then shuts off, then fires again 8 minutes later — a short-cycle pattern that pulses uneven temperatures across the rooms and shortens burner life. A typical 1,800-square-foot LA home needs 50,000 to 70,000 BTU input on a Manual J calculation; many homeowners are sold 90,000+ BTU furnaces because that is what the contractor stocks. We size to the load, not to the truck inventory.

Title 24, Permits, and Combustion Safety

California Title 24 requires a permit for any new gas furnace install. The City of LA, Burbank, Glendale, and county jurisdictions all require a final inspection that includes combustion air verification and a CO test at the burner. EA Mechanical pulls the permit, installs to code, and stays on site through inspection. Combustion safety on a brand-new install is non-negotiable — we run a calibrated combustion analyzer and document CO under 9 ppm at the heat exchanger before signing off.