How Much Does Gas Furnace Installation Cost in Cotati, CA? (2026)

Average Cost

$2,542–$5,369

Materials

$1,375–$3,280

Labor (Wine Country)

$580–$850

A gas furnace installation includes removing the old unit, installing the new furnace in your existing utility closet or garage, connecting gas and flue piping, integrating the evaporator coil and ductwork, wiring the thermostat, and performing combustion analysis and safety testing. Modern condensing furnaces (95%+ AFUE) offer significant energy savings over older 80% models. This estimate uses Sacramento-area pricing for equipment and labor in 2025-2026.

Sacramento winters are mild with lows in the mid-30s, but a reliable furnace prevents frozen pipes and keeps your family comfortable from November through March.

Cotati is located in Sonoma County (Wine Country). Small bohemian town near Sonoma State University. The local utility provider is PG&E.

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City

Units

Materials Included

Gas furnace (80-96% AFUE)1 unit

$1,200–$2,800

Flue/vent pipe (PVC or metal)1 set

$80–$250

Gas line fittings & flex connector1 set

$40–$90

Thermostat (basic programmable)1 each

$30–$75

Condensate pump (high-efficiency units)1 each

$45–$120

Filter rack & media filter1 each

$25–$65

Labor

HVAC installer6h @ $75–$110/hr

$450–$660

Sheet metal technician2h @ $65–$95/hr

$130–$190

Contractor Markup30%

0%Avg 30%100%

Materials

$1,375–$3,280

Labor

$580–$850

Markup

$587–$1,239

Estimated Total Cost

$2,542 – $5,369

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California Building Code

California Title 24 requires combustion air provisions, proper flue sizing, and seismic strapping for gas furnaces. HERS duct-testing is mandatory when ductwork is altered.

Project Timeline

Old furnace removal

1-2 hours

Shut off gas and electrical supply, disconnect the existing furnace, cap gas lines, and remove the old unit from the premises.

New furnace positioning & connections

3-4 hours

Position the new furnace, connect supply and return plenums, run gas piping, install the flue/vent, and attach the condensate drain (if applicable).

Electrical & thermostat wiring

1-2 hours

Wire the furnace to the electrical panel, connect the thermostat, and verify control board communication.

Testing & commissioning

1 hour

Perform a gas leak check, combustion analysis, verify temperature rise, test all safety controls, and demonstrate system operation to the homeowner.

Materials Breakdown

Material	Qty	Unit	Unit Cost	Total
Gas furnace (80-96% AFUE)	1	unit	$1200–$2800	$1,200–$2,800
Flue/vent pipe (PVC or metal)	1	set	$80–$250	$80–$250
Gas line fittings & flex connector	1	set	$40–$90	$40–$90
Thermostat (basic programmable)	1	each	$30–$75	$30–$75
Condensate pump (high-efficiency units)	1	each	$45–$120	$45–$120
Filter rack & media filter	1	each	$25–$65	$25–$65

Gas Furnace Installation in Cotati — FAQ

How long does a furnace last in Sacramento?+

A well-maintained gas furnace typically lasts 15-20 years. Sacramento's mild winters mean less wear compared to colder climates, so your furnace may last toward the higher end of that range with annual tune-ups.

Should I get an 80% or 95%+ AFUE furnace?+

A 95%+ AFUE condensing furnace costs $400-$800 more but uses about 15% less gas per heating cycle. In Sacramento, where winters are relatively mild, the payback period is longer (8-12 years). However, if you plan to stay in your home long-term, the upgrade is worthwhile.

Can I install a furnace in my garage in California?+

Yes, but California code requires the burner and pilot be at least 18 inches above the garage floor. The unit must also be in a FVIR (flammable vapor ignition resistant) enclosure or an approved sealed-combustion model.

Is a permit required for furnace replacement?+

Yes. Sacramento County and most NorCal jurisdictions require a mechanical permit for furnace replacement. HERS testing may be required for duct changes.