Diamond HVAC
HVAC contractor in San Jose, CA.
In Diamond HVAC's own words
We provide service in San Jose and surrounding areas for repair and installation HVAC systems such as AC (Air Conditioner), Heat Pump, Furnace, Ductless split system and Air Ventilation.
- Trade
- HVAC contractor
- Business address
- 808 W San Carlos St #235, San Jose, CA 95126
- Telephone
- (650) 585-6888
- Website
- diamondhvacus.com
- Hours
-
- Monday8:00 am - 5:00 pm
- Tuesday8:00 am - 5:00 pm
- Wednesday8:00 am - 5:00 pm
- Thursday8:00 am - 5:00 pm
- Friday8:00 am - 5:00 pm
- SaturdayClosed
- SundayClosed
From the business's Google listing, checked Oct 2026
- Register
- CA register
Recorded as supplied and as found in public sources. This register makes no credential or quality claim about any business; check license status with the state board.
Google Reviews
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The air conditioning decide not to operate on a holiday and one of the hottest days of the year so far. It was the afternoon when we called Diamond HVAC. Georgi added one more service call to his already busy day to make sure that an older couple in their upper 80s would be comfortable enough to sleep that night. Great service, great attitude, very talented and conscientious. Diamond HVAC is now our “go to” for service and a new HVAC system.
Jeffrey R.
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Diamond HVAC furnace repair exceeded all my expectations! From the moment I called, their team was prompt, professional, and knowledgeable. They diagnosed and fixed the issue with my furnace swiftly, ensuring my home stayed warm during the cold spell. Their attention to detail and excellent customer service make them my go-to for all HVAC needs. I highly recommend Diamond HVAC to anyone in need of reliable and efficient service!
Mahri M.
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I recently had the pleasure of using Diamond HVAC's services, and I'm impressed with their efficiency and reliability! Scheduling was easy, and their technician arrived promptly, demonstrating professionalism and expertise. The thorough inspection revealed potential issues, with the technician explaining each step transparently. The repair work was done efficiently, and I appreciated the valuable maintenance tips provided. The pricing was fair and transparent, making the overall experience positive. I highly recommend Diamond's for their reliable and customer-centric HVAC services.
Serge O.
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Excellent service. Very easy to communicate with office. Technician arrived on time was very friendly and professional. What surprised me he wasn’t trying to sell me something I don’t need . He find the issue very fast replaced my old thermostat and everything works perfect since then. Previous company told me that my whole unit needs to be replaced. Highly recommend.
Yakov L.
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I recently had an excellent experience with these guys when I needed my mini-split system repaired. The tech seems to be very knowledgeable. They quickly diagnosed the issue and explained it to me in a clear and understandable way. Appreciated their transparency with estimate provided. The repair was done efficiently, and my mini-split system now works fine now. Thanks guys
Anton K.
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This company did a great job! I needed to install an air conditioner and the guys did it quickly and efficiently. I am very happy, thank you!
A S.
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Very professional from start! I needed to fix the AC unit at my old house and I got a few quotes from different companies, but these guys are cheaper; but it doesn’t affect the quality! Got the quote over the phone, scheduled an estimate and let me tell you the guy who came in was really professional and knew what he was doing. Gave me the best price and fixed it in no time. Would definitely recommend you guys in the future! Thank you!
Stanislav G.
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When choosing a company, it was important for me that a technician arrive as soon as possible and diagnose my equipment. The technician came the next day, found the leak, showed it to me and suggested solutions to the problem. I agreed, everything was done right in front of me. Everything is working great now! I recommend Diamond! Thank you guys!
Nikolya S.
About Diamond HVAC
HVAC services in San Jose
Diamond HVAC provides residential and commercial repair and installation for several climate control systems. The company says it specializes in air conditioning, heat pumps, furnaces, ductless split systems, and air ventilation. Its website names maintenance services that include checking system operation and condition alongside future recommendations.
According to the company, it has operated in the San Jose area since 2023. The business handles both residential and commercial clients. In San Jose, utility gas accounts for 58% of heating fuel use per the American Community Survey. NOAA normals for the area show a mean temperature of 59.1 degrees F.
Ratings and reviews
Diamond HVAC has a 5.0 rating from 8 reviews. Reviewers frequently mention the promptness of the technicians and the transparency of the estimates provided. Some customers noted the company's ability to diagnose issues quickly without unnecessary equipment replacement suggestions.
San Jose climate and systems
The company provides service for various heating and cooling configurations. Its work covers air conditioner installation and furnace repair. These services address local needs in a region where heating degree days reach 2771 per the 1991-2020 NOAA normals.
Diamond HVAC works throughout San Jose.
Services, brands and warranty details come from the company's own website. Ratings, hours and reviews come from Google. Town figures come from the US Census and NOAA.
More HVAC contractors in San Jose
About San Jose
| Population | 989,814 (2025) |
|---|---|
| County | Santa Clara County |
| Average yearly snowfall | 3.6 inches |
| Heating degree days | 2,771 |
| Most common heating fuel | Utility gas |
Sources: U.S. Census Bureau. NOAA U.S. Climate Normals 1991-2020.