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    Diamond HVAC

    5.0 (8 reviews)
    Open 8:00 am - 8:00 pm

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    HVAC installation or replacement

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    11 months ago

    I had a great experience. Technician came on time, and he helped me fixed the starter on the condensor unit

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    1 year ago

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    Ask the Community - Diamond HVAC

    Chill Heating and Cooling

    Chill Heating and Cooling

    (254 reviews)

    Great service today provided by Vik! Was able to quickly diagnose my heater issues. Initially said…read morehe would have to special order a part that would take a week but managed to find one same day and come back to take care it. Would highly recommend!

    We had a great experience with Chill Heating and Cooling. First off, I had a total of four…read moredifferent companies give me a quote to replace our existing Furnace & A/C units. Chill was the second to arrive and give us an estimate. At first glance when comparing the numbers they gave me to that of the first company, they seemed way off and too cheap to be real. After getting more quotes, Chill remained the lowest price; however, the cost for some of the other companies came in somewhat close. Upon closer review of the contracts, the type of units offered by Chill were much better. A clear difference and made the price look even better! So we signed up and set our appointment up for the next week. We had to move the date since we felt the timing was terrible (expecting 90° weather when the following week was going to be 60°). They moved the appt with ease, even setting it for the following Monday -- on Memorial Day! This was something they offered and I jumped on it, since I was planning to work from home anyway that day. The day of the install went as expected. No issues arose; although, for the guys in the attic I think they would say they had to make some unplanned adjustments -- no complaints to myself or family. All three workers were extremely kind and respectful. They arrived at 9:20 AM and were out before 6:30 PM. Before starting work, they laid down tarps along the hallway (where the entrance to the attic is). They placed all of the old furnace/AC equipment out in front of the house, but cleaned it all up and packed it into their vehicles. They swept up most all of the leftover debris that fell from the attic space and gathered all of their tools. Upon exiting, one of the installers walked me through how to setup the Google Nest Thermostat. He was very patient and waited to ensure the system was fully functional before leaving (used a thermostat gun to read the temperature on one of the vents).

    Galaxy Heating & Air Conditioning - Galaxy Services team

    Galaxy Heating & Air Conditioning

    (988 reviews)

    My wife and I recently hired Galaxy to replace our aging gas furnace and AC with a new 4-ton…read moreMitsubishi heat pump system, and the entire experience was fantastic from start to finish. During the estimate phase, Constantine was a breath of fresh air. Instead of pushing generic upsells, he actually "downsold" us by engineering exactly what we needed to work seamlessly with our home's downflow ducting. He was honest, straightforward, and clearly explained the system without any high-pressure sales tactics. For the installation, Mike and Diego were our crew. They arrived a little past the initial 9am window on the first day, but they worked incredibly hard and got the entire complex job done right on schedule. At the start of Day 1, I handed them a simple "homeowner's QA" list of things I wanted to check with them at the end. They were super nice, listened, and gladly accommodated every single request. The workmanship is top-notch. They perfectly sealed the exterior wall where the lineset exits, helped me get the Kumo Cloud Wi-Fi connected to my phone, and hauled away all the old debris, leaving the site spotless. As a testament to their technical skill, when I asked about the refrigerant line vacuum test, they had pulled it down to 350 microns--which is a great number and proves they don't cut corners! Pics attached of the final setup. If you want an HVAC company that is honest in the office and expert in the field, we highly recommend the Galaxy team!

    fair honest and respectful. They're not here to upsell you. They're here to improve your quality of…read morelife through heating ventilation and air-conditioning. They came out to fix my air-conditioning, which went out in the recent heat wave. It was a simple repair so they said no charge. This type of customer service is unheard of today's economy. I could think of at least one other service that would have tried to sell me a brand new system.

    The QuietCool Guys

    The QuietCool Guys

    (55 reviews)

    Responded right away, received a quote that was reasonably good and completed the job as promised…read more The system is quiet and very effective. Josh explained and demonstrated the system and answered my questions respectfully. Very good customer service throughout the process.

    I had an exceptional experience with QC Guys, from purchasing the fan to the seamless installation…read moreprocess. The scheduling was effortless, with clear and consistent communication via email and text every step of the way. Messages like scheduling, notifying they were on their way, and text reminders for the appointment. Next level professionals. On installation day, Cody and his partner were professional and efficient. They promptly set up the work area, protected the surroundings, wore shoe covers, and clearly explained where the inlet would be placed to ensure we were happy with the aesthetic. They unpacked everything and went straight to work By the time I was done with chores in the backyard, they finished the job super duper fast, and when I returned inside, the fan was fully installed and working perfectly, exactly as I wanted. The fan quality is excellent with a brushless motor. Such a good value for efficiency and long life. The airflow throughout the house is awesome, cooling every room with fresh air while saving on electricity--a great value. I highly recommend QC Guys for their outstanding service and quality. True professionals.

    Perfect Star Heating, Cooling, & Electrical - We are proud to be a locally owned and operated family business that services all makes and models in Alameda & Contra Costa County!

    Perfect Star Heating, Cooling, & Electrical

    (576 reviews)

    I had to have the air ducts under my house replaced and since I had used Perfect Star for my new…read morefurnace and AC unit I decided to trust them with this big job. Emmanuel V., Gabe H. And Diego R. were awesome! Professional and clean. They kept me in the loop and made sure that I was satisfied with their work. I would hire them again in a heartbeat! Thanks again guys!!

    This company is a scam. Do yourself a favor and go with another contractor you can trust who will…read morenot try to lie to you to get your business. I found this company based on all the wonderful Yelp reviews to tune up my old gas furnace- something I do every year before the winter season to ensure optimal maintenance. They came out and immediately refused to do the service citing possible asbestos tape. I asked how this was possible when the last 15 years I've gotten service and have even asked the contractors to do a visual inspection of my system. They weren't sure but said that another employee in the area can come look and give me an estimate for a new system. I thought this was shady and it turns out, I was 100% right. They came later that day and quoted me $26K for a new system not including subcontracting to get the asbestos removed (another $1500). I was told and shown pictures that there was evidence of the same tape inside the duct work. I was told I would get these pictures sent to me with along with the estimate but never received any of them. I got someone to come out and test a sample of said material for $100 which did come out positive for asbestos. However the only asbestos that presented any harm was the tape on the outside of the system. There was no asbestos inside but it was recommended that I do more expensive air testing since Perfect Star said I would not be able to use my heater without the asbestos getting released into the air. Not only was this stressful to hear right before the cold weather, but I was very concerned that over the last decade I had inadvertently put my whole families health in danger using this furnace. Meanwhile, Raymond Kinder texted me a few days later to find out if I was going to move forward with the new unit. I told him asbestos removal was my priority. His response via text was "if they remove asbestos, you will not be able to run that furnace as the gases will not be vented out properly." This was not true. After several weeks of not using my heater and exploring other options to deal with a pretend problem they created for me, I went with Air Quality Testing who charged $540 for an air test. $640 later along with having no use of my heater, I learned that there is no asbestos running through my air or ducts. Perfect Star literally lied to me in order to attempt to get me to drop nearly $30,000 on a new system. Stay away from this company! They do not deserve your business for lying to their customers.

    Diamond HVAC - hvac - Updated May 2026

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