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    Recommended Reviews - Efficient HVAC

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    Tony T.

    My furnace did not generate enough heat, so it cost a lot of money to keep the heater on. It turned out that the duct tape in the air vent was loosed, preventing air/heat to flow. Gabriel inspected the furnace free of charge and gave me a reasonable estimate. He then processed to complete the job the next day. Overall, a great job.

    Condenser getting installed

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    6 years ago

    Business owner information

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    Gabriel M.

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    9 years ago

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    7 years ago

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    Gabriel M.

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    7 years ago

    I left message for this company as no hot water and they responded very quick . They fix problem next early morning . Thanks !

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    Gabriel M.

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    9 years ago

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    8 years ago

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    8 years ago

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    Page 2 of 2

    Ask the Community - Efficient HVAC

    The phone number is not working. Is this business no longer open?

    My apologies Vanessa I thought I successfully added the new phone number. My phone number is 510-860-3242. Feel free to call anytime if you have questions! Thank you, Gabriel/Owner

    Don’t See Your Question? Ask Away!

    Review Highlights - Efficient HVAC

    Gabriel's integrity, fair pricing, and recommendations 100% put E-fficient HVAC in the Above and Beyond category.

    Mentioned in 35 reviews

    Read more highlights

    Crystal Water Line

    Crystal Water Line

    (45 reviews)

    Top-notch work! Highly recommend Crystal Water Line!…read more Amar installed a Clack split-tank water softener and an under-sink Reverse Osmosis system in my home. The work in the garage and under the sink was clean, professional, and done right. Amar went above and beyond and when he needed a specialized tool, he went out and bought it on the spot to ensure a perfect fit rather than cutting corners. He used top-tier components (10% cross-linked resin, Jacobi catalytic carbon, Clack WS1 valve) and explained everything clearly with full transparency. Fantastic service, I will definitely hire Crystal Water again!

    I got a new house in Morgan Hill and Ive been wanting to get a water softener but I didnt want the…read moreRO system cuz I didnt want them to drill a hole in my island. Of course I yelped a few places and I had people come to my house and quoted me but I eventually end up going with Crystal Water Line. Ammar, the business owner is super helpful and his communication with me was great! I even referred him to my moms house and she did it too! So I am glad ...he was able to give her a deal! And her house was built in the 80's too! He even brought her bags of salt for the water softener and showed her which I really appreciate cuz shes in her 70's and not trying to have her carry those heavy bags! Good work!! appreciate what you did for my mom. Also the salt bags are on sale at Home Depot so I got the minimum of 5 as he informed me that the tank needs about 5 bags. I highly recommend him! and his services. Hes thoughtful and always answer my text, and I am pretty sure the same questions are always asked but hes so patient with me as it is my first time owning this type of water system. O yes the water has been really good too! so again Thank You!

    Efficient HVAC - hvac - Updated September 2026

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