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ABR Air Conditioning
“Very friendly and professional services matched with efficient products has really transformed my seasons in nice comfortable setting.”
Best HVAC Contractors near Diamond Bar, CA
We have 2 companies in Diamond Bar on file, and both are on this list, along with 22 from towns including Anaheim (3, 11 mi), Orange (3, 13 mi) and Brea (2, 6 mi).
9 open 24/7 · 21 open weekends · all 24 rated 4.5+ · 21 show a license
Data verified October 15, 2026
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Honest Pro Air Conditioning & Heating
- Solution
- The Future
- Fair
“Called them to help with a recurring issue that other heating companies couldn't figure out.”
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Steve's 5 Star Service Cooling
- Drain
- Pipe
- Faucet
“Nothing more comforting than knowing, when AC needs servicing before the next heat wave, Steve's is accommodating with my schedule, and was available the next day.”
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Albert Air Inc.
- Unit
- Questions
- Project
“It was agreed that a single stage heat pump was perfect for our needs and with solar and excess electricity, we now no longer pay for electricity, gasoline (elec.”
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Biard & Crockett Plumbing
- Tankless Water Heater
- Informative
- Upsell
“James did a great job installing a pressure regulator on my sprinkler system and figured out how to get my toilet to flush properly after two plumbers were not able to fix it!”
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Quantum Heating & Air Conditioning Inc.
- Work
- Cold
“I highly recommend quantum air conditioning very professional they came in clean out the vents they even took off there shoes left everything very clean replaced parts in the air conditioning unit very reasonable 10 STARS they came out and replaced ...”
The 24 companies listed for Diamond Bar, CA work on furnaces, heat pumps and air conditioners. Each profile repeats what the company publishes about its hours, its license and the equipment it fits, alongside ratings and quotes drawn from public reviews.
Area overview: Diamond Bar, CA
The 24 companies on this page are rated from 4.5 to 5.0 across 8,904 reviews; 21 have 50 or more reviews. When customers rate these companies on specific qualities, they most often praise professionalism (88%), responsiveness (85%) and punctuality (80%). The topics that come up most in reviews of the companies on this page are "price", "efficient" and "informative". 9 are open around the clock; 21 are open on Saturdays and 11 on Sundays. The services the companies on this page list most often on their websites are air conditioning (4), heating (4), indoor air quality (4), water heaters (3) and attic insulation (2). 21 show a license on their websites; 4 list staff certifications (NATE) and 12 have a BBB rating of A or A+. Domain records put 17 websites of the companies on this page at ten or more years old; the oldest dates from 1998. 9 offer emergency call-outs; 17 offer financing or payment plans; 9 give free estimates; 13 are family- or locally-owned and 15 list coupons or special offers. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Why do some of these firms show another city?
2 of the 24 companies are based in Diamond Bar; the others come from other towns within 30 mi. This trade drives to you, so a shop over the county line is normal. Ask whether your address carries a travel charge.
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Alps Heating & Air Conditioning
- Ducts
- Thermostat
- Hvac System
“I got 5 bids in addition to Alps and they were not the least expensive or most expensive quote, but Alps was by far the most professional and provided the best value”
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Air-Tech Air Conditioning & Heating
- Job
- Mitsubishi
- Wall
“They do charge a fee for someone to come out plus a lower hourly fee for any additional time after the first hour, but that's standard and the hourly fee was very reasonable.”
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Brea/Orange County Plumbing Heating & Air Conditioning
- Work
- Maintenance
- 2022
“Brea Plumbing has been a great teammate for the Brea Olinda School District when trouble arises, no matter what time of day or the severity of the plumbing problem, they are very dependable, professional and show a lot of pride in their work.”
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Moffett Plumbing & Air
- Camera
- Personality
- Water Softener
“Jonathan Ward and his assistant, Jessie were very professional installing my family's new Navien water heater after our 11 year old Navien water heater finally expired.”
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Metz Air Control
- House
- Duct
- Attic
“Pedro came to install a receptacle for peace of mind and he fixed a roof vent from the weather's wear and tear and so I just want to say how happy we were with the quality service and care he showed.”
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Accurate Electric
- Ceiling Fan
- Outlet
- Shoe Covers
“I was very impressed by the way they cleaned up after finishing the job and left the house looking like there hadn't been work done, except for the beautiful lights they installed.”
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Rand Aire Mechanical Contractors Inc
- Furnace
- Honest
- Attic
“After awhile he said it appeared one of far remote zones had a problem with the pump that sends condensed water back to be discharged and was shutting the system down”
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Temp Air System Inc
- Informative
- The Office
- Pressure
“The friendly technicians were very good at the beginning of work with communication, such as optimum placement of system as we discussed through all the scenarios for this split air installation.”
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Drain Doctor Plumbing & Rooter Services
- Work
- Polite
- Camera
“In the end, the results spoke for themselves – my bathtub drain was flowing smoothly once again, thanks to the exceptional service provided by Drain Doctor.”
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Living Air Design
- Maintenance
- Capacitor
- Roofing
“They had the system we wanted, listened to our concerns, answered our questions, and our technician Chris came and installed it the way it should be installed.”
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Jamison AC & Furnace Repair
- Maintenance
- Leak
- Knowledge
“Service was great and technician pointed out several critical components, which are still under warranty, that were incorrectly installed by a different contractor when HVAC was swapped just two years ago”
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Marvel Air Conditioning & Heating
- Job
- Heat Pump
- American Standard
“Showed when appointment was scheduled, technician was friendly and knowledgeable would use again , they installed our new system 5 years ago and has preformed well”
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Home Comfort USA
- Pressure
- Insulation
- Air Scrubber
“From initially helping me choose the proper system for my home, through to Bernie and Angel very professionally installing the unit, I'm very pleased and highly recommend their services.”
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Klaus & Sons Plumbing
- Diagnosed
- Valve
- Upsell
“In addition to unclogging the sewer line from the toilet and giving advice and an estimate on a few other issues, he installed a new toilet for us - all in less that 3 hours.”
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W.e.d.o. A/C & Heat
- Heating
- Cost
- Price
“I have a baby at home so I had so much anxiety about our broken AC and it possibly costing me an arm and a leg to get it fixed, but that wasn't the case.”
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Kevin Shaw Plumbing
- AC
- System
- Estimate
“Recently my soft water system needed repair, and I was impressed with both the speed of response and quality of work that I have come to know and expect from them.”
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Air Med Heating & Air Conditioning
- Team
- Questions
- Family Owned Business
“I will continue to use their service if I need them & will ALWAYS refer them to anyone having FAU/HVAC issues knowing I can be confident I have not swayed anyone in the wrong direction....”
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Solace Plumbing Heating and Air
- Pricing
- Well
- Pressure
“Great service, Brandon was very patient & kind explaining the process for the thermostat, as per service they really bring the quality to the customer , glad to have good people around with good experience”
HVAC, Heating & AC Services in Diamond Bar, CA Cost Estimates
Minimum cost
$1844
Maximum cost
$11047
National Average
$5751
Avg Per Hour Rates
$153
$3948
$7623
Average price range is based on 259 cost profiles
Why these companies made our list
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