slant right decoration light
filter and duct sunnyvale ca

Come Back Home to Comfort

Schedule Your HVAC Service

Allow our experts to service the HVAC system of your home or business professionally. Reach us now at (510) 610-3123, or fill out the form below to get started.

    Assistive text
    Assistive text
    High-Quality Heating & Cooling Services

    Looking for a Professional HVAC Contractor Near Sunnyvale, CA? We’ve Got You Covered

    Welcome to Grumpy's HVAC. If you need a dependable HVAC contractor near Sunnyvale, CA, you’ve come to the right place.

    With over three decades of experience in the heating and cooling industry, you can rest assured that our HVAC contractors will provide you with second to none repairs, replacement, and inspecting services. Don’t settle for less than the best, and allow our experts to provide you with the heating and cooling solutions your home or business needs.


    We understand that time is money. As such, we pledge never to waste our customers’ time! We’ll be there on time, always. 


    We pride ourselves on bringing over three decades of experience to the table. You can rely on our experts to provide you with high-quality workmanship.

    Good Attitude

    We believe that providing great customer service is of the utmost importance. Our experts are always ready to deliver service with a smile!


    There’s not an HVAC issue that our experts can’t tackle. We’ve got you covered, from AC and furnace repairs to more complex HVAC retrofits.

    We’ve Been Doing This for a While

    When it comes to something as valuable as your home or business, you should only work with the best contractors you can find. Working with HVAC systems is not the exception! Our experts count with decades of experience in various related fields, improving our services when compared to other contractors. On top of that, we’re a family business. We understand the importance of having a properly working HVAC unit in our homes. We’re also very particular when it comes to our customers’ businesses, as we want to help them thrive, not fail!

    hvac unit outside house sunnyvale ca
    We’re Your HVAC Service One-Stop-Shop!

    We Offer All-Inclusive Heating & Cooling Services

    Our goal is to be your only point of contact for all your heating and cooling needs.

    Whether you need AC repair, furnace repair, or even an HVAC retrofit, we’ve got you covered. Our experts have access to specialized tools and equipment to tackle your needs professionally and timely. On top of that, we can also assist you with furnace replacement and various AC replacements as well.

    Contact an HVAC Professional Today

    If you’re ready to get your heating and cooling needs servicing by a team of tried and true professionals near the Sunnyvale, CA, area, you’re in the right place! Contact us today to set up an appointment at your earliest convenience. Make sure to ask for a free estimate and our senior discounts while you’re on the phone with us!

    Get Professional Heating & Cooling Services!

    Customer Reviews

    What Our Customers Are Saying


    Bryan Chase


    Furnace was turning on/off oddly. They came out, checked it all out and found that a small piece of foam had come loose, causing the sensors to improperly kick on. Simple fix, straightforward and forthright. Great experience.

    Google Reviews


    Dave O.


    David was excellent to work with. I came to him needing a second opinion as another HVAC firm tried to push me to replace my unit claiming it needed a refrigerant that was not readily available. Turns out they misdiagnosed the issue altogether (surprise) and it just needed a capacitor replacement. David was an excellent communicator and very above board. He came highly recommended from a neighborhood forum and I can attest he lives up to this reputation. His repair pricing was very fair.



    Morgan B.


    I highly recommend Grumpy’s HVAC. From the first conversation to job completion, David was honest, thorough, and competent. We badly needed to install central heating and air in our 1950’s home, and cannot be more pleased with the workmanship and outcome. Everything was arranged with precision, the installation went brilliantly with no fuss. The skill level, attention to detail, timeliness, and cleanliness were very appreciated. Call Grumpy’s for a job well done!



    Ela K.


    I had a great experience with David who is a pleasure to talk to and not grumpy at all 😉 He offered us a good quote for a flat-fee HVAC maintenance, was available within a day and came on time. He is licensed (it was not clear from the Yelp profile) and very knowledgeable. His approach is no-nonsense, efficient, minimal “upsell” which I really appreciated. Our house had a problem with the first floor getting super heated, and the second floor to be cold, even when the main damper appeared fully open. His fix worked – he adjusted the dampers and explained to me the problem spots he found. I waited some time before writing the review, but I can attest the situation definitely improved and the heat level seems more balanced. Were very happy to use Grumpy’s HVAC – Thank you David! Highly recommended!



    Debbie N.


    We were fortunate to find David Burnet of Grumpy’s HVAC!! We’ve called him 2 times for service and both times he was able to come right away and did a very thorough job! This last time he reconnected our roof flues after we replaced our roof (the roofers did it incorrectly!!) and he also cleaned and replaced our furnace filters (duplex). He is very knowledgeable & trustworthy and his prices are very reasonable. I’m spreading the word to all my co workers & friends because it is hard to find great HVAC companies! thank you David!!



    Chaitanya Datye


    We found Grumpy’s HVAC through a colleague of ours. We reached out to David since our AC was not functioning as expected. David was able to accomodate our schedules and was super responsive with text/call. After the initial inspection, he mentioned to us that the entire unit would have to be replaced since it was almost 25 years old and the compressor was busted. He explained to us all the nitty-gritties about what was broken and what it would take for installing a new unit.
    He immediately responded with some quotes and told us that we would need a crane job since the unit had to be installed on the roof. His quote was very competitive and he explained to us about the various brands of the AC unit and their associated costs.
    He promptly got all the permits from the city and was able to do the installation very efficiently in under a week’s time. He promptly arrived at the set date and time for the install, got everything set up and was infact ahead of schedule! He did the job brilliantly and very efficiently and got our AC unit working in no time. Throughout the process, he was very responsive, very easy to communicate with, friendly and it was truly a pleasure to work with him!
    We are super happy with the new unit and would highly recommend Grumpy’s HVAC!! Thank you!

    Google Reviews


    Will Feliciano


    Our heater stopped providing us with hot air in the middle of the night and my family and I woke up to a freezing house. I called Grumpy’s and David showed up within 2 hours and then diagnosed the issue with the unit quickly. He provided us with a quote and once we agreed, he got right to work. He found a new unit and told us he would have it installed by that night so that my family was able to have heat! His price was very reasonable for the value he provided, he was pleasant the entire time, and you can tell he is a true professional who cares about his customers! I will be using Grumpy’s for all of my heating and cooling needs!

    Google Reviews


    Linda Maybach Hong


    Had a leak in my ceiling from HVAC use due to a clogged drain. Called Grumpy and he showed up within the hour and fixed the issue almost right away. He even stayed to make sure the leak had stopped. Grumpy (not a grumpy guy at all, he’s very nice!) was professional and knowledgeable in what he does. I recommend him!

    Google Reviews


    Michael Rowell


    David installed a super quiet and efficient all electric heat pump system that we are super happy with. We had nothing but a 1940’s original gas floor furnace, so this was a full system install. After discussing ducted and ductless options with him, we decided to go for a ducted central system. They went above and beyond with the ductwork, working in difficult spaces to get the vents to the ideal locations with perfectly balanced air flow. He was great to work with and he’s obviously very experienced at this kind of work as everything went super smooth—highly recommended.

    Google Reviews


    Carol Lynch


    David was kind, courteous and kept me informed. On time each day and did an excellent job. Since I needed to get the attic and house ready with upgrades for electric etc. David talked with me about the other contractors needed and I’m sure none of the work would have gone as smoothly without his advice.Thank you David!

    Google Reviews


    Dave Millman


    We hired David to fix a flaky furnace on the home we just moved into. He arrived on time and was very methodical in his debug process. After two hours work, the furnace works flawlessly.Just so you know, we checked YouTube for the symptoms, and NONE of the videos showed the correct answer. All the YouTube videos pointed to a dirty flame sensor, none pointed to clogged combustion tubes. That’s what experienced guys like David are for.

    Google Reviews


    Joe Bayes


    We called Grumpy’s to replace the 70-year-old gas furnace in our new-to-us house. David came by, discussed our options, gave us a very reasonable quote, and three days later we had a brand new mini split heat pump system! This thing works great and I’m very glad we went with Grumpy’s.

    Google Reviews

    Areas We Serve

    We proudly offer our services near Sunnyvale, CA, and the surrounding areas. Reach us today at (510) 610-3123 to learn more about which areas we serve. 

    slant right decoration light