Green Core cost guide · Sonoma & Marin

What should a new furnace, AC, heat pump or water heater cost?

Real installed price ranges from our jobs. Slide to your system size and every option updates, so you can compare them side by side.

Prices as of October 2026 · Green Core Heating & Air

The short answer

With Green Core, a furnace and AC replaced together typically costs $11,000 to $27,300 installed, a ducted heat pump $12,000 to $36,500, and a new gas furnace $5,400 to $13,200. A standard tank water heater typically costs $2,850 to $4,800, and tankless or heat pump water heaters run about $6,000 to $12,600, before rebates, as of October 2026.

Typical installed prices on Green Core jobs in Sonoma and Marin, before rebates. Every quote is free and in writing.
Furnace + AC	$11,000–$27,300
Furnace (80%)	$5,400–$8,700
Furnace (95%)	$7,400–$13,200
Heat pump	$12,000–$36,500
Dual fuel	$9,000–$30,000
Ductless mini split	$4,500–$14,000
New ductwork	$5,000–$11,000
Tank water heater	$2,850–$4,800
Tankless water heater	$6,500–$9,450
Heat pump water heater	$6,000–$12,600

Compare by size

Heating and cooling prices for your size

Every bar uses the same scale. Light green is the full range for that system. Dark green is typical for the size you pick. Furnaces follow along in BTUs.

Your system size

1.5 tons5 tons

Not sure what size you need?Find my size

Furnace + AC

All sizes: $11,000–$27,300

A matched gas furnace and air conditioner installed together.

Installed price$11,000–$27,300

What puts a job at the low or high end

Lower end

Standard-efficiency equipment
Existing line set and pad reused
Easy hall-closet install

Higher end

High-efficiency, variable-speed equipment
New line set, pad or electrical
Attic or crawlspace install

Furnace (80%)

All sizes: $5,400–$8,700

A standard-efficiency gas furnace that vents through a metal flue.

Installed price$5,400–$8,700

What puts a job at the low or high end

Lower end

Same location and venting
Basic single-stage model

Higher end

Quieter two-stage or variable-speed model
Attic or crawlspace install

Furnace (95%)

All sizes: $7,400–$13,200

A high-efficiency gas furnace with PVC venting and a condensate drain.

Installed price$7,400–$13,200

What puts a job at the low or high end

Lower end

Easy route for new PVC venting
Standard model

Higher end

Variable-speed model
Longer or more complex vent route

Heat pump

All sizes: $12,000–$36,500

A ducted heat pump that heats and cools, replacing a furnace and AC.

Installed price$12,000–$36,500

What puts a job at the low or high end

Lower end

Standard-efficiency equipment
Ducts and electrical in good shape

Higher end

Top-efficiency, variable-speed equipment
Duct or electrical panel upgrades

Dual fuel

All sizes: $9,000–$30,000

A heat pump paired with a gas furnace that covers the coldest nights.

Installed price$9,000–$30,000

What puts a job at the low or high end

Lower end

Standard-efficiency equipment
Existing gas line and venting reused

Higher end

High-efficiency, variable-speed equipment
New venting, line set or electrical

New ductwork

All sizes: $5,000–$11,000

New, sealed ducts insulated to R-8, today's code for most of Sonoma, Napa and inland Marin.

Installed price$5,000–$11,000

What puts a job at the low or high end

Lower end

Roomy attic or crawlspace
Fewer duct runs

Higher end

Tight attic or crawlspace
Changes to returns or registers

Scale: $0 to $40,000All sizesYour size

Ductless

Mini split prices by room size

Mini splits are sized for the room they heat and cool, so they have their own slider. Prices are for one indoor and one outdoor unit.

Mini split size

6,000 BTU (small bedroom)36,000 BTU (large open space)

Ductless mini split

All sizes: $4,500–$14,000

One outdoor unit and one indoor unit for a room, addition or ADU.

Installed price$4,500–$14,000

Multi-room systems are priced after a visit.

What puts a job at the low or high end

Lower end

Standard model
Short line set and easy wall mount

Higher end

Premium model built for colder weather
Long line set or new electrical

Water heating

Water heater prices for your household

Water heaters are sized by how many people use hot water, not by tons.

People in your home

1–25 or more

Tank water heater

All sizes: $2,850–$4,800

Gas or electric tank. Often same-day when our schedule allows.

Installed price$2,850–$4,800

What puts a job at the low or high end

Lower end

Same size and fuel as your old tank
Garage location

Higher end

Larger tank
Code updates like straps or venting

Tankless water heater

All sizes: $6,500–$9,450

Hot water on demand that doesn't run out.

Installed price$6,500–$9,450

What puts a job at the low or high end

Lower end

Gas line and venting already sized for it
Short vent run

Higher end

New gas line or venting
Moving it to a new location

Heat pump water heater

All sizes: $6,000–$12,600

The lowest energy use of the three.

Installed price$6,000–$12,600

What puts a job at the low or high end

Lower end

All-in-one model in a garage
Circuit already nearby

Higher end

Split system with the heat pump outdoors
New circuit or panel work, switching from gas

What changes the price

Why two homes get different quotes

System sizeMeasured in tons or BTUs. We size it to your home, not the old unit's label.

Efficiency and comfort levelHigher-efficiency, variable-speed equipment costs more and runs quieter and more evenly.

Your ductworkOld or leaky ducts may need work for a new system to perform well.

Electrical, gas and ventingNew circuits, panel work, a bigger gas line or new venting add to the job.

Location and accessGarages and hall closets are simplest. Attics and crawlspaces take more time.

RebatesHeat pumps and heat pump water heaters may qualify for rebates that lower your cost.

No surprises

What every Green Core install includes

Free in-home estimate with written pricing
Equipment sized to your home
Permit and inspection
Removal and haul-away of the old equipment
Floors protected and the work area cleaned up
Startup, testing and a walkthrough of your new system
Rebate paperwork when you qualify

Ways to save

How to keep the cost down

Get the size rightA system sized to your home can be smaller and cheaper than a rule-of-thumb guess.Try the home sizing check

Ask about rebatesRebates may be available for heat pumps and heat pump water heaters, depending on program funding. We check and handle the paperwork.

Replace before it failsPlanning ahead lets you compare options instead of taking whatever is fastest.

Fix ducts with the new systemDoing ductwork during an install avoids paying for two separate jobs.

Common questions

Quick answers

How much does a new HVAC system cost in Sonoma and Marin?

With Green Core, a furnace and AC replaced together typically costs $11,000 to $27,300 installed, and a ducted heat pump $12,000 to $36,500, before rebates, as of October 2026.

How much does a new furnace cost?

A standard 80% gas furnace typically costs $5,400 to $8,700 installed, and a high-efficiency 95% furnace $7,400 to $13,200.

How much does a water heater replacement cost?

A standard gas or electric tank typically costs $2,850 to $4,800 installed. Tankless runs about $6,500 to $9,450 and heat pump water heaters about $6,000 to $12,600 before rebates.

How much does a ductless mini split cost?

A single-zone mini split typically costs $4,500 to $14,000 installed. Multi-room systems are priced after a visit.

Why is the price range so wide?

Size, efficiency, your ductwork, electrical and how easy the space is to work in all change the price. Your free written estimate is specific to your home.

Are there rebates?

Rebates may be available through programs like TECH Clean California, BayREN, Sonoma Clean Power and MCE, depending on funding. We check your address and handle the paperwork. The federal 25C tax credit ended for systems installed after December 31, 2025.

Get your exact price

We'll look at your home and give you written prices for each option so you can compare. Estimates are free.

(707) 988-5858Book a free estimate

Pricing disclaimer: This page is a general pricing guide based on typical Green Core installs in Sonoma and Marin, as of October 2026. It is not a quote or an offer. Your in-home written estimate may be higher or lower for a number of reasons, including site conditions, equipment selection, system size, ductwork and electrical needs, code and permit requirements, and access to the work area. Prices shown are before any rebates.