Giant HVAC is a trusted HVAC contractor with over 20 years of experience providing heating and air conditioning services. We specialize in HVAC installations, system replacements, heat pumps, ductless mini-splits, and ductwork. Our team is known for honest recommendations, clear communication, and clean, professional workmanship that keeps homes comfortable year-round.
Is your heating or air conditioning system not working the way it should? Whether you’re dealing with weak airflow, inconsistent temperatures, or a complete system failure, Giant HVAC is here to help. Our experienced technicians will properly diagnose the issue and provide honest, straightforward recommendations. Once the problem is identified, we’ll walk you through your options and provide clear, upfront pricing for the repair or solution.
Thinking about upgrading your heating and air conditioning system, replacing outdated ductwork, or looking to add cooling to your home? Giant HVAC offers complimentary, no-obligation on-site estimates for new equipment and air duct installations.
Our team will evaluate your home, discuss your comfort goals, and walk you through the best options for your space and budget. We specialize in heat pump systems, ductless mini-splits, furnace and AC replacements, and ductwork installation and modifications.
We focus on quality installation, energy efficiency, and long-term performance — not just quick fixes. From start to finish, you can expect honest recommendations, clear communication, and clean, professional workmanship.
Reviews
4.9
61 reviews
5 stars
58
4 stars
2
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1 star
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KQ
Kevin Quinn
Apr 28, 2026
5.0
HVAC systems are very complex these days. Joe of Giant HVAC carefully explained all the various ways to go. Installation was fantastic. Very honest and straightforward. Highly recommend.
SH
Susan Hall
Mar 11, 2026
5.0
Replaced gas wall heater. Excellent work.
GH
Gene Hertel
Jan 24, 2026
5.0
Had the heater replaced as well as replacing the ducts. Joe and his team did a fine job and the new system is keeping the house warm. We're also looking forward to the AC in the summer for the first time.
PA
Pola Alas
Aug 9, 2025
5.0
Thanks Joe and Team!
We recently had a whole house fan installed along with a split AC unit for each half of our home, and we could not be happier with the results! From start to finish, the service was absolutely exceptional. Communication was clear, timely, and professional, every question we had was answered in detail, and we always felt informed about the process.
The installation team arrived right on time, worked efficiently, and left everything spotless when they were done. The whole house fan has been a game changer for quickly cooling the house in the evenings, while the split AC units keep each side of the home perfectly comfortable no matter the temperature outside.
If you’re looking for top-quality equipment combined with outstanding service and installation, I can’t recommend them enough. This was truly a 5-star experience from start to finish!
RS
Richard Sam
Mar 18, 2021
5.0
We wanted to add an air conditioning section to our existing furnace in the attic. Joe from Giant came through with a quote for all Carrier products and a reasonable price. Joe explained the job clearly. We noted all 5-star ratings and decided to give him the job, even though he is in business only for a couple years. His crew came through and did the entire job in 2 days, it was efficient and clean. The system worked and passed city inspection with very minor changes, mainly to the labeling of electrical wires. I am happy with the result, and will recommend Giant to anyone who wants to add AC to an existing furnace system.
Giant HVAC, Inc is an HVAC contractor with over 14 years of experience, specializing in quality installation of HVAC equipment.
Where is Giant HVAC, Inc located?
Giant HVAC, Inc is located at 43012 Christy St, Fremont, CA 94538, USA.
What are the operating hours of Giant HVAC, Inc?
The company is open Monday to Friday from 8:00 AM to 5:00 PM, Saturday from 9:00 AM to 5:00 PM, and closed on Sundays.
How can I contact Giant HVAC, Inc?
You can contact Giant HVAC, Inc by phone at +1 510-624-4268 or via email at joe@giant-hvac.com.
What payment options does Giant HVAC, Inc accept?
They accept American Express, Apple Pay, Cash, Check, Discover, Financing, Invoice, MasterCard, Visa, and Zelle.
Which counties does Giant HVAC, Inc serve?
Giant HVAC, Inc serves customers in Santa Clara, Alameda, San Mateo, and Contra Costa counties in California, USA.
Are there convenient places nearby where I can mail or receive packages when visiting Giant HVAC, Inc?
Yes, there is a UPS Access Point location nearby which provides courier and shipping services.
Can I grab a meal or coffee near Giant HVAC, Inc?
Nearby dining options include Sri Ananda Bhavan, an Indian restaurant, and Lloyd's Donut Kitchen, a bakery and coffee shop.
Are there any wellness or beauty services close to Giant HVAC, Inc?
Yes, Rosehip Nail Spa and Rosehip Nails & Lash offer spa and nail salon services, and Planet Fitness provides gym and recreational facilities nearby.
What can customers do after visiting Giant HVAC, Inc for HVAC services?
Customers can explore local shopping centers like Mowry East Shopping Center, or visit specialized stores like Kumar Jewelers and Beck’s Shoes nearby.
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