Commercial HVAC Services

Greater San Jose Area

Whether you’re looking to proactively maintain your air conditioning units, get emergency heating repair, or improve your indoor air quality with a new ventilation system, you can rely on our experienced HVAC technicians to do the job right the first time, every time. No job is too big or too small.


Keystone Mechanical services retail stores, office buildings, restaurants, warehouses, and multi-family residential properties for all commercial heating emergencies. Our experienced technicians will diagnose the issue and explain all options before repairs start. Keystone Mechanical also works with the architects and builders in new structures, recommending the right unit for the size and function of the building, and within budget. Our technicians are on call 24/7.


Your employees expect to work in a clean, safe environment. Keystone Mechanical can assist you in doing just that by offering ventilation repair, maintenance and installation in your heating and cooling system. Air ventilation is very important in manufacturing or other buildings where pollutants can disperse through the system. We guarantee fast, effective services for all your HVAC needs. Call us for routine maintenance or unexpected emergencies.

Air Conditioning

Our experienced HVAC technicians install, maintain, and repair air conditioning systems. With an initial diagnostic, we prepare a cooling plan, whether the project is a replacement, retrofit or new construction. All commercial air conditioning services will be performed as promptly and with as little disruption to your business as possible. Cooling systems are important to the health of your business and we provide emergency service. Our technicians also provide regular maintenance to clean and inspect the cooling system which could prevent unexpected costly repairs. No matter how big or small your project, we always provide superior service and craftsmanship.

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“Keystone is super responsive, reliable, punctual, and very competent.”
Arif A.
“Super impressed with integrity and focus on making a customer happy.”
James K.
“Quality service at competitive rates. Recommend!”
Seb L.
“Keystone deserves more than 5 stars.”
Mary T.
“Do yourself a favor and use Keystone Mechanical.”
James K.
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Contact Us

To Join the Team

We’re always looking for honest, trustworthy, hard working HVAC technicians to join our growing team. If you think you have what it takes, contact us today to learn more about our current job opportunities.