HVAC Services in Diamond Bar, CA

Quiet, efficient comfort for Diamond Bar homes.

Your Diamond Bar HVAC Experts

Trusted HVAC Solutions for Diamond Bar Homes

Diamond Bar homeowners expect consistent comfort, quiet operation, and energy efficiency. ABC Heating & Air Conditioning provides expert HVAC repairs, installations, and maintenance tailored to hillside properties, larger homes, and modern systems throughout Diamond Bar.

Precision Comfort for Hillside Living

Diamond Bar’s elevations and multi-level homes require HVAC systems designed for airflow balance and quiet performance. Our technicians diagnose issues accurately and install high-efficiency systems that deliver even comfort without excess noise or wasted energy.

Air Conditioning Installation

We install high-efficiency air conditioning systems designed to keep your home cool while lowering energy costs. From helping you choose the right unit to professional setup, we handle everything so you can stay comfortable all summer long.

Get a new AC installed

Air Conditioning Maintenance

Regular maintenance keeps your air conditioner efficient, prevents costly repairs, and ensures reliable cooling when you need it most. We clean coils, check refrigerant levels, and tune up every part for peak performance.

Book your seasonal tune-up

Air Conditioning Repair

Whether your AC is blowing warm air, making noise, or not turning on, our expert technicians quickly diagnose and fix the issue. We restore your comfort fast — without surprise costs or delays.

Request fast AC repair

Neighborhoods & ZIP Codes We Serve

We proudly serve all of Pomona, including historic districts and newer residential areas:

Diamond Bar Hills
South Diamond Bar neighborhoods
Grand Avenue corridor
Pathfinder Park area
Brea Canyon border communities

Book online

Our Promise

ABC 100% Satisfaction Guarantee

We've helped make our neighbors' homes comfortable, safe and efficient in Chino, Orange County and the Inland Empire for more than 30 years. Whether your air conditioning system doesn't work, you want to upgrade to the most efficient AC on the market or you just have an old air conditioner, rest assured we'll help you make the right decision for you and your family. We pride ourselves on excellent customer service and our ABC 100% Satisfaction Guarantee.

Learn about our Maintenance Membership

Cooling Power for Hot Summers & Elevated Homes

Higher elevations and inland heat require systems that work harder. We install and service HVAC equipment designed to handle Rancho Cucamonga’s climate efficiently.

Experience with hillside homes and complex floorplans
Quiet, high-efficiency HVAC system options
Detailed airflow and zoning expertise
Licensed, insured, and highly trained technicians
Clean, professional installations with minimal disruption

Book Your Free Systems Estimate Today!

Get started on your comfort journey today! Book your free estimate and let our experts provide tailored solutions for your heating and cooling needs—no strings attached.

Book Online Call (909) 730-0753

Support

Frequently asked questions

Let us know if you can't find an answer to your question.

Do you specialize in HVAC systems for hillside homes?

Yes — we regularly service hillside and multi-level properties that require advanced airflow and zoning solutions.

Can you install quiet, energy-efficient systems?

Absolutely. We offer high-efficiency, low-noise systems ideal for Diamond Bar homes.

Do you provide maintenance plans?

Yes — preventive maintenance plans are available to improve system performance and longevity.

Precision Comfort for Diamond Bar Homes

From system upgrades to reliable repairs, we deliver HVAC solutions built for Diamond Bar living.

Book Online Call (909) 730-0753

What Our Customers Say

Discover why customers love ABC Heating & Air Conditioning for reliable HVAC services and exceptional care.

"For a monthly fee Every six months they service my ac unit they call me ahead of time to schedule it. Always in time sending texts when they will arrive the fee is well worth it they do a through service making sure heater and AC is running properly the ABC team is great especially Mitchell"

Two men, one dressed in white religious robes giving a thumbs up and smiling, the other in a dark suit holding a microphone.

Aurelio P.

Brea, CA

Dec 11, 2024

"ABC will not disappoint! We are signed up for their maintenance program. So convenient and reasonably priced."

Woman in a black dress dancing gracefully with light beams in a spacious, industrial-style room.

Alvin R.

Chino Hills, CA

Feb 15, 2023

"Short story: My wife and I recently had our HVAC system replaced by ABC. We had been putting it off for years, and now that it's done, we wonder why we waited so long. We'll definitely be recommending ABC to our friends - everybody we interacted with was very friendly and easy to work with. I wish all contractors were this easy. ABC, any interest in taking on a bathroom remodel or block wall? Jk."

JP C.

Fullerton, CA

Apr 26, 2023

"I cannot thank ABC enough for their work ethic and efficiency in finding and fixing my problem. A special thanks to Tom and Trevor for working with me as well. Bravo ABC, you are number one in my book !!! This is a five star rating from me."

Close-up of a bald eagle's head with sharp yellow beak and white feathers against a dark background.

Lorelei S.

Chino, CA

Sep 5, 2024

"We need more companies and people like this in our world. Thank you ABC. I will continue to use your company."

Marlon M.

Mira Loma, CA

Jun 17, 2024

"Of course my AC unit broke in the middle of the heat! I used ABC some years back so I reached out and spoke to Trevor-who was the most personable person ever! They even made an exception by coming late and when Ivan arrived he was prompt, detailed, easy to work with and accommodating. I will definitely be referring them to my friends, family and neighbors!!"

Christina T.

Chino Hills, CA

Jun 25, 2024

"Thanks to Ivan for being awesome. He was very polite, quick, and efficient. He explained everything in detail and got the job done. If you need AC repairs, I highly recommend ABC heating & Air conditioning. Ask for Ivan."

Alvin R.

Chino Hills, CA

Jun 14, 2024

“Thank goodness we found ABC heating and Air Conditioning, the rest is history.”

Young man in a tuxedo smiling and looking to the side.

Tom I.

Fullerton, CA

Jul 13, 2020

Our work in action

Project Highlights

Explore our projects to see how ABC Heating & Air Conditioning delivers expert HVAC solutions that improve comfort, efficiency, and air quality for both residential and commercial spaces.