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Top-Rated Furnace / forced air heating system install or replace pros in Sunol - Updated Nov 2026

Avatar for DUKES HEATING & AIR CONDITIONING
DUKES HEATING & AIR CONDITIONING
4.8(
135
)
Gas Furnace / Forced Air Heating System - InstallElectric Furnace / Forced Air Heating System - InstallHeat Pump - Install or Replace+43 more

Serving Sunol, CA and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"Great. They contacted me right away. It wasn't an emergency but Iti was cold, so they still came first thing on the first business day. The technician explained what he was doing and why the prior repair done by somebody else probably failed. The rate was reasonable. It's been a couple of days and it seems the furnace is working, so everything good so far."
Heat Pump Repairs & Installations
Central Air Cut-Ins
Electric Furnace Repairs & Installations
Response time1 day
Response rate100%
32 neighbors recently requested a quote
Avatar for Smart Heating and Air Conditioning, Inc.
Smart Heating and Air Conditioning, Inc.
5.0(
23
)
Gas Furnace / Forced Air Heating System - InstallHeat Pump - Install or ReplaceFurnace / Forced Air Heating System - Install or Replace+7 more

Serving Sunol, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Emergency services offered

"Smart Heating and Air Conditioning was very responsive and came out when we really needed them. We were without heat as our old furnace no longer worked and our AC was on its last leg. Mike came out to give us a quote which was the best out of three that we had. He went over all options with us and now we are very satisfied to have a new and efficient heating and AC system. They lived up to their name as well, by upgrading my thermostat to a WiFi one that added that SMART touch to my system."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+27

Response time1 day
26 neighbors recently requested a quote
Recommended by52%of homeowners
Avatar for Albert Nahman Plumbing, Heating, and Cooling
Albert Nahman Plumbing, Heating, and Cooling
4.4(
722
)
Gas Furnace / Forced Air Heating System - InstallElectric Furnace / Forced Air Heating System - InstallHeat Pump - Install or Replace+23 more

Serving Sunol, CA and surrounding areas

Approved (Corporate)

In business since 1981

Free estimates

Warranties offered

"Tony and Josh arrived when they said they would, stayed the full day, performed an extensive service including specialized equipment and techniques, taking every needed care, leaving the system better than when it was first installed. VERY professional at all times and pleasant people."
Living room Mini-Split
Aquasana home Filtration
Almost no disturbance at EBMUD meter
Navien with filtration to protect the heat exchanger
New house valve and Pressure Reducing Valve

+73

Response time8 hrs
Response rate100%
44 neighbors recently requested a quote
Avatar for Air Sharks
Air Sharks
5.0(
12
)
Gas Furnace / Forced Air Heating System - InstallElectric Furnace / Forced Air Heating System - InstallHeat Pump - Install or Replace+7 more

Serving Sunol, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"Absolutely the best HVAC company in the area. If you are looking for a company for your HVAC needs, look no further. It is superb in every aspect: customer service, onsite specialist who did the inspection and quoting, technicians who installed the system. Their price is extremely competitive, especially for the high end systems. I was shopping for a 80% 2-stage furnace but I ended up getting a Lennox 99% variable-speed furnace because the price was too good to pass. But it is money well spent. It is so quiet and powerful. I highly recommend Air Sharks. They actually put a smile on our faces."
Daikin Heat Pump Install
Daikin Heat pump Install and Duct Work
Before picture.
BEFORE
Daikin Heat Pump Install

+22

Response time1 day
Response rate100%
21 neighbors recently requested a quote
Avatar for Galaxy Heating & Air Conditioning
Galaxy Heating & Air Conditioning
4.9(
8
)
Gas Furnace / Forced Air Heating System - Repair

Serving Sunol, CA and surrounding areas

Approved

In business since 2015

Free estimates

Warranties offered

Galaxy Heating & Air Conditioning is a locally owned HVAC company proudly serving homeowners and businesses across the San Francisco Bay Area. We specialize in energy-efficient heating and cooling installations, heat pumps, furnace replacements, ductless systems, and indoor air quality upgrades. As authorized dealers for leading brands like Mitsubishi, American Standard, Carrier, Lennox, and Rheem, we deliver expert craftsmanship backed by manufacturer warranties.\n\nOur certified technicians handle every project with professionalism, from design and permits to testing and safety inspections, ensuring each system is code-compliant and built to last. Whether you need a seasonal tune-up, emergency repair, or complete comfort system upgrade, Galaxy provides honest service, transparent pricing, and dependable results.\n\nServing Pleasant Hill, Concord, Walnut Creek, Danville, Alamo, Oakland, Berkeley, Lafayette, Moraga, and nearby cities.

Heat Pump
Mitsubishi heat pump
Furnace Installation
Mitsubishi Ducted HVAC
Mitsubishi HVAC

+3

21 neighbors recently requested a quote
Recommended by28%of homeowners
Avatar for Better Water Heaters
Better Water Heaters
4.5(
195
)
Heat Pump - Install or Replace

Serving Sunol, CA and surrounding areas

Approved

In business since 2001

Free estimates

Emergency services offered

"Our water heater started leaking and needed to be replaced. Called in the morning and had someone out in the afternoon. This was actually our second quote. The first guy only gave the heater a cursory look before quoting a price. The Better Water Heaters technician actually examined the heater, plumbing and electrical connections before discussing options. We discussed replacing the original and switching to a tankless system. After we did some research and asked some friends who had a tankless system, we decided to go with the tankless. We scheduled an appointment for the next day and had it installed. Very smooth, very professional."
Additional Photos
Additional Photos
Additional Photos
1 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Giant HVAC Inc
Giant HVAC Inc
5.0(
6
)
Gas Furnace / Forced Air Heating System - InstallHeat Pump - Install or ReplaceDuctless Mini-split Heating System - Install or Replace+1 more

Serving Sunol, CA and surrounding areas

Approved

In business since 2004

Free estimates

Credit card accepted

Giant HVAC is a locally owned and operated heating and air conditioning company based in Fremont, CA, proudly serving the Bay Area. With over 20 years of hands on experience, we specialize in HVAC system replacements, air conditioning installations, furnace upgrades, ductwork, and zoning systems. \n \nWe focus on doing things the right way with clean installations, properly designed systems, and honest recommendations tailored to your home and budget. No pressure and no shortcuts. \n \nWe are licensed, bonded, and insured, and we handle everything from start to finish including permits, HERS testing, and final inspections. \n \nWhether you are upgrading to a high efficiency system, adding air conditioning, or looking for better comfort throughout your home, we take pride in delivering reliable and long term solutions. \n \nGiant HVAC built on comfort, honesty, and quality workmanship.

Furnace replacement
Furnace replacement
Furnace replacement
Furnace replacement
New construction project

+3

8 neighbors recently requested a quote
Recommended by16%of homeowners
Avatar for ONZONE HEATING & COOLING INC
ONZONE HEATING & COOLING INC
5.0(
5
)
Ductless Mini-split Heating System - Install or ReplaceGas Furnace / Forced Air Heating System - RepairThermostat - Install or Replace+2 more

Serving Sunol, CA and surrounding areas

Approved

Free estimates

Warranties offered

Credit card accepted

Onzone Heating and Cooling provides professional heating, ventilation, and air conditioning (HVAC) services for residential customers. We specialize in HVAC installation, replacement, repair, and maintenance, including heat pumps, furnaces, air conditioning systems, ductwork, and mini-split systems.\n\nOur team is committed to delivering reliable solutions, quality workmanship, honest recommendations, and excellent customer service. Whether you need a quick repair, routine maintenance, or a complete HVAC system replacement, we work hard to keep your home comfortable and energy efficient.\n\nAt Onzone Heating and Cooling, customer satisfaction, professionalism, and dependable service are our top priorities.\n\nFounded by Oleg Nebrat, bringing 28 years of HVAC experience to residential and commercial clients.

ONZONE
Water Heater+HVAC
ONzone installer!!
3 neighbors recently requested a quote
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FAQs for furnace / forced air heating system install or replace projects in Sunol, CA

Converting from an oil furnace to an electric furnace isn't a simple swap—the oil system needs to be completely removed before installing the electric furnace. You'll need a full electric system installation, but you might be able to reuse existing ductwork if it's up to current safety standards. You’ll need to budget for a new electric furnace installation, which costs between $1,800 and $6,200, including professional removal, proper disposal, and safe installation of the new system.

Electric furnaces are 100% efficient at converting electricity into heat. However, some of that heat can be lost as it travels through your home's ductwork or escapes through poorly insulated areas. That's why regular duct maintenance and proper home insulation are important to maximize your furnace's efficiency and reduce heat loss, ensuring consistent warmth and lower energy costs.

With proper maintenance, an electric furnace can last anywhere from 20 to 30 years, outlasting the average gas furnace's lifespan of 15 to 20 years. To keep your electric furnace running efficiently, schedule regular cleanings, tighten connections, and have inspections done before winter arrives. With routine maintenance, you’ll ensure consistent, safe heating for years to come.

The size of the electric furnace you need depends on factors like your home's square footage, climate, and insulation quality. As a general guideline, those who live in warmer climates should multiply their square footage by 30 to 35 BTUs, while those in cooler areas should multiply it by 50 to 60 BTUs.

Consulting with an HVAC professional can help you determine the exact size that's right for your home.

An electric furnace works by converting electricity into heat using high-resistance heating elements. A blower then pushes the warm air through your home's ductwork, distributing heat evenly throughout your space. Since there's no combustion involved, electric furnaces eliminate the risks associated with gas furnaces and provide consistent, reliable heating when properly installed.

An electric furnace uses between 40 and 80 kilowatts per day to heat your home. The exact amount it uses depends on factors like your home's size, insulation, and overall energy requirements. Larger homes or those with poor insulation use more energy than smaller, well-insulated spaces. A professional furnace assessment can help confirm the ideal unit size for your needs.

The Sunol, CA homeowners’ guide to furnace / forced air heating system installs or replaces

From average costs to expert advice, get all the answers you need to get your job done.