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    Duff Mechanical Services

    5.0 (3 reviews)
    Open Open 24 hours

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    Services - Duff Mechanical Services

    HVAC installation or replacement

    HVAC system repair

    HVAC system maintenance

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    2 years ago

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    3 years ago

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    3 years ago

    Needed quality electrical done throughout my business. No issues. Clean work. Got the job done sooner than given estimate.

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    Airmaxx - Airmaxx Heating and Air Conditioning Logo

    Airmaxx

    (2.1k reviews)

    Vladimir was a little late, but took care of everything. Very detail oriented and explained…read moreeverything to me so I could understand. Perk: took a look and assisted with troubleshooting my QuietCool system. Recommend Vladimir!!!

    Best Value, Fast Service, and Professional! I recently hired…read moreAirmaxx to install a new HVAC system at a property in Carmel Valley, and they exceeded every expectation. As a Realtor, I'm used to vetting contractors, so I gathered five different quotes for this project--including bids from Tytum, Progressive Heating, and Fuse AC. Airmaxx not only provided the best price quote, but their proposal was the most complete. They were the only ones who made the permitting process completely seamless, which was critical for my tight timeline. And great equipment recommendation. The Carrier 37MURA High-Efficiency Heat Pump--it's a "slim line" model, so it has a much smaller footprint than those old bulky cubes, which was perfect for my San Diego side yard. Plus, it uses variable-speed inverter technology, making it really quiet and efficient. The communication with their office was prompt and professional from the initial Yelp inquiry to the final invoice. They scheduled the work quickly, and the installation of the new Lennox furnace was fast and clean. It's rare to find a company that hits the trifecta of best price, highest quality, and fastest turnaround. I highly recommend the Airmaxx team for anyone in San Diego looking for reliable HVAC work!

    West Coast Heating Air Solar

    West Coast Heating Air Solar

    (1.4k reviews)

    We had a full HVAC installation that included removing the old units, relocating the new units from…read morethe garage to the attic, moving the thermostat, installing all new ductwork, and cleaning and replacing all vents. It was a Big job, and I must say the West Coast team did an excellent job. Communication was great throughout, and the entire team was a pleasure to work with. We had a couple of other companies provide quotes, and West Coast beat them all! They were reliable, professional, and affordable. The installation went smooth and passed all inspections with flying colors! Thank you to the West Coast Team for the Great service!

    Uriel Blancas is the HVAC tech who did the spring maintenance re-check today and he did an…read moreexemplary job. 10/10, FIVE STARS IN ALL ASPECTS. TIMELY- Uriel called 30 min before his arrival and then, arrived at the stated time. This is particularly helpful so I can move my bunny to another room with all of his belongings. ATTENTION TO DETAIL - I saw him place a protective cloth down on the floor before he placed the ladder and tools down. I also noticed there was a bottle of cleaner with his supplies. He cleaned the inside vents as well as the compressor on the roof. He also tied off a loose wire/when checking the air handler in the ceiling. KNOWLEDGEABLE and THROROUGH - Uriel did a complete system check and then, he sat down with me to explain what was done and why. He addressed the concerns I had about some of the prior readings in terms that I could understand and shared tips that will help ensure my system runs at its most efficient. Example: A higher MERV doesn't always mean "better" and can actually restrict the airflow. He said that for my particular system I should use a MERV10 filter and change it every 3 months. He changed my filters and then, left me with two spares to use before the fall check comes. FRIENDLY - In the course of chatting with Uriel, it came up that I might benefit from having more filtered air coming into my condo. He made a recommendation for a part that would replace the standalone room air purifier I currently use. He placed this info into the after-visit summary so I can "research it and see if it fits with my needs and finances." There was zero pressure to make a purchase on the spot. And while this next item has nothing to do with the knowledge or ability of an HVAC tech, I greatly appreciate that he did NOT smell like cigarette / e-cigarette smoke or strong cologne as I have a bunny and people in my family have asthma. Thank you, Uriel, for a job well done.

    Max Air HVAC - One of our fleet vehicles

    Max Air HVAC

    (45 reviews)

    Max Air has won our business for life! About a year ago, they installed a heat pump to replace our…read morefailing furnace. The heat pump gave us air conditioning in addition to heat - a welcome bonus. Recently, we started hearing a whistling sound and worried that a bearing or other component was going bad. Max Air came out, examined the system top-to-bottom and determined that the ductwork in our house was too small and that the force of air through the ducts caused the whistling. They adjusted the fan to blow more gently and that took care of the whistling. Max Air could have told us we need to replace all ductwork. Instead they found an easy and practical solution for us. We highly recommend them.

    I had MAX AIR HVAC company come out to completely remove and install brand-new ductwork in my 1500…read moresq ft attic, and I couldn't be more satisfied. They arrived right on time at exactly 9:00 AM, and from start to finish, they were professional, communicative, and incredibly thorough. What really stood out was how they walked me through every step of the process, making sure I understood what was happening and why. They nailed every detail with care and precision, and it's clear they take pride in their work. To me, the most important qualities in any company are trust, honesty, and peace of mind -- and they delivered all three. When the job was done, I felt 100% confident everything had been done right. This team will absolutely be my go-to HVAC company moving forward. Thank you for the awesome work, fellas! Glen and Dmytro

    J & M Air Conditioning & Heating

    J & M Air Conditioning & Heating

    (168 reviews)

    Matthew was prompt, personable and extremely knowledgeable on products and services. I purchased…read morenew ducting and a heat pump. His tablet has a new technology that measured the room, calculated how much energy is lost through the windows, and accounted for my vaulted ceilings. With this information he then was able to recommend two different models of heat pump that would work well with my solar panels. He expedited paperwork and offered financing at an affordable rate. In addition I was given a veteran discount!

    I contacted this company to inspect a persistent musty odor coming through my HVAC system when it…read morerains. The salesperson who came out told me my ducts were "ripped" and needed full replacement, quoting nearly $6,000. He stated this was the only solution to resolve the smell. After I explained that I could not afford that, he then strongly pushed a $1,300 air purifier as something I "really should" purchase. Feeling uneasy, I sought a second opinion from an independent duct specialist and shared the same photos. I was told the ducts are intact and that the outer layer condition does not impact airflow or cause odor. I was also advised that a rain-related musty smell is more consistent with a moisture issue, such as a roof or pipe leak -- not duct failure. This experience was extremely stressful. Being presented with a costly, urgent repair and then upsold an air purifier -- only to later learn the ducts may not be the issue at all -- left me feeling misled. I would strongly encourage others to seek a second opinion before agreeing to major HVAC duct replacements.

    Duff Mechanical Services - hvac - Updated May 2026

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