Commercial HVAC, Plumbing & Electrical Services

Are you on the lookout for a reliable company to service your commercial heating, ventilation, and air conditioning (HVAC) equipment? Do you need to upgrade your business’s heating and cooling system, or is there an issue that needs to be repaired?
Whether you’re managing a retail space, office building, restaurant, or other commercial property, a reliable heating and cooling system is essential for maintaining comfort, productivity, and energy efficiency. Ongaro & Sons understands the unique demands of commercial HVAC systems, from installation and retrofits to routine maintenance and reliable repairs.
We take a proactive approach to ensure your system performs at its best year-round, helping you reduce energy costs, extend equipment life, and avoid downtime. As a family-owned company, we’re committed to doing the job right, on time, and with minimal disruption to your operations.
Comprehensive HVAC Services in Marin, Sonoma & Napa County
Ongaro & Sons is your go-to solution for all commercial HVAC services in Marin, Sonoma, and Napa counties, as well as all surrounding the North Bay communities.
Whether your furnace is malfunctioning or your AC unit is making unusual noises, our commitment is to resolve your issues swiftly and effectively so that there is minimal disruption to regular business practices.
Contact us today at 415-741-2820 for expert commercial HVAC services throughout the North Bay.
Our Full Range of Commercial Services
Commercial HVAC We Can Install, Maintain, and Repair
These units, available in all-electric or gas/electric dual-fuel options, range from 2 to 10 tons. They are designed for both heating and cooling applications on rooftops, with services including repair and replacement.
This category includes multiple indoor head systems and ceiling pancake units, suitable for residential and light commercial use. Options for larger projects include various outdoor unit configurations.
We specialize in designing and constructing air duct systems for efficient and effective HVAC solutions in light commercial businesses.
Venting systems are crucial for maintaining air quality and safety in buildings by expelling exhaust gases and bringing in fresh air.
Our team has expertise in Energy Recovery Ventilators (ERVs) and Heat Recovery Ventilators (HRVs), offering sales, service, repair, and installation to optimize indoor air quality (IAQ) and energy efficiency.
This includes installation and maintenance of make-up air systems, which are essential for replacing air exhausted from commercial buildings to maintain indoor air quality and comfort.
We offer specialized HVAC solutions tailored for multifamily housing projects, ensuring efficient and effective heating, cooling, and ventilation for residential complexes.
Commercial HVAC Installation and Replacement Services
When it’s time to install or upgrade your commercial HVAC system, Ongaro & Sons delivers customized solutions that fit your business’s unique needs. Our team starts with a thorough evaluation of your building’s layout, usage, and energy demands to recommend the right heating and cooling equipment. We work with top manufacturers to provide high-efficiency systems that offer long-term value and reliable performance.
Whether you’re outfitting a new construction project, expanding your current system, or replacing aging equipment, we prioritize seamless installation with minimal disruption to your business operations. Our licensed technicians adhere to strict safety and code compliance standards, ensuring your system is properly sized, correctly installed, and built to last.
We also offer ductwork design, zoning systems, rooftop units (RTUs), and energy-efficient upgrades like smart thermostats and building automation systems.
Commercial HVAC Repairs
When HVAC issues arise, fast, reliable repair service is critical to maintaining a comfortable and functional commercial environment. Ongaro & Sons provides prompt commercial HVAC repair across the North Bay, with technicians trained to diagnose and fix all major brands and system types.
We understand how equipment breakdowns can impact productivity, customer satisfaction, and safety. That’s why we arrive equipped with the tools and parts needed to resolve most problems on the first visit. From uneven heating or cooling to refrigerant leaks, faulty compressors, or thermostat issues, we restore system performance quickly and efficiently.
We back our repair work with a warranty at Ongaro & Sons. Contact us to get your commercial HVAC system back in top condition.
Commercial HVAC Maintenance Services
According to the U.S. Department of Energy (DOE), commercial buildings consume 40 percent of the energy used in the United States, so imagine reducing a portion of that and how much you could save in heating and cooling costs each month!
At Ongaro & Sons, we provide maintenance services to keep your commercial HVAC systems running smoothly for years. We recommend scheduling furnace maintenance in early fall and AC maintenance in spring.
Our commercial maintenance programs are tailored to your building’s needs and may include filter changes, coil cleaning, system inspections, refrigerant level checks, and safety controls testing. We also provide detailed reports after every visit, so you’re always informed about your system’s condition.
With scheduled maintenance from Ongaro & Sons, you can plan ahead, stay compliant with manufacturer warranties, and protect your bottom line through consistent, dependable HVAC performance.
Ask us about a customized maintenance plan tailored to your business needs and budget. Maintenance plans offer a hassle-free way to care for your HVAC system and avoid unexpected repairs.
Schedule Your Commercial HVAC Service Today With Ongaro & Sons
Need a dependable company for your commercial HVAC installation, service, or repair?
Serving Novato, Tiburon, Sebastopol, and elsewhere in the North Bay, Ongaro & Sons is your trusted partner for commercial HVAC installation, repair, and maintenance. We are committed to your business’s comfort and efficiency. Call us at 415-741-2820 or request services online today for a consultation.
Member Discount
Ongaro Commercial Maintenance
Proper preventative maintenance for your commercial system is a must for lower energy bills, fewer unexpected costly repairs, and a longer system life span. Having our experts regularly inspect and clean your system is a smart business move.
No matter what type of commercial heating, cooling, plumbing or electrical system you may have, indoors or outdoors or a combination of both, Ongaro & Sons' commercial professionals have the valuable expertise to maintain it all.
Frequently Asked Questions
We serve a wide range of commercial properties including office buildings, restaurants, retail stores, schools, healthcare facilities, and industrial sites.
The price depends on the unit’s size and specific features. For example, a small-to-medium-sized commercial property will differ from a larger commercial building. The capacity of the system and its energy efficiency will also determine the price point. At Ongaro & Sons, we believe in transparent pricing and providing detailed quotes to help you make informed decisions.
These could be indications of underlying issues. Our Ongaro & Sons repair specialists are adept at identifying and fixing minor problems before they escalate into bigger, more expensive ones.
Benefits of professional HVAC maintenance include inspection, cleaning, and prompt resolution of potential issues. Regular maintenance can improve your commercial HVAC system’s energy efficiency.
According to the U.S. Department of Energy (DOE), commercial buildings consume 40 percent of the energy used in the United States. Imagine reducing a portion of that and how much you could save in heating and cooling costs each month!
Ask us about a customized maintenance plan tailored to your business needs and budget. Maintenance plans offer a hassle-free way to care for your HVAC system and avoid unexpected repairs.
Generally, repairs might be the best option if your commercial HVAC system is relatively new or the damage is minor. However, upgrading to a new system might be more economical and efficient for more severe issues, especially those not covered under warranty.
Regular maintenance is crucial to keep your system running efficiently and to maintain your warranty. It’s akin to regular oil changes for a vehicle. Your air conditioner and furnace should be inspected and maintained annually.
Typically, well-maintained commercial HVAC systems last around 15 years. However, if you notice rising energy bills or frequent repair needs, it might be time to consider new, energy-efficient equipment. That way, you can enjoy maximum efficiency and comfort for your customers, guests, and employees while reducing your monthly heating and cooling costs.
Your Comfort, Our Priority
Ongaro & Sons is your trusted heating, cooling, plumbing, electrical, and solar expert, specializing in reliable maintenance and repair services that keep your home running efficiently year-round.
Our certified technicians deliver unmatched expertise with fast, friendly service across Marin, Sonoma and Napa County. From HVAC tune-ups to plumbing repairs and electrical upgrades or solar solutions, we focus on energy-efficient performance and long-term comfort. Count on us to maintain the systems that power your home and keep your environment just the way you like it.
Licensed, Insured, Background-Checked
Our technicians are licensed, experienced, and trained to service all makes and models.
Locally Owned and Operated
Serving the Napa, Marin, and Sonoma communities with personalized, hometown service.
Reliable Repairs
We respond quickly and get the job done right the first time, with no surprises.
Since 1932
Why Ongaro & Sons for Commercial Service
One licence holder covering HVAC, plumbing and electrical, which is what keeps a building problem from becoming a scheduling problem.
Schedule Service →Three trades, one contractor, one point of contact
Ongaro & Sons holds C-20, C-36 and C-10 among eleven active classifications. A rooftop unit that needs a gas line and a disconnect does not become three vendors and three site visits.
Work scheduled around your trading hours
Shutdowns get planned to land when the building is empty. That is a scheduling commitment made before the job starts, not a favour asked afterwards.
Planned maintenance rather than reactive callouts
Scheduled service on rooftop units, water heating and panels catches the failures that otherwise close a business for a day. It also makes the annual cost predictable.
Permits, inspections and compliance documentation
Commercial work in Marin, Sonoma and Napa carries permitting and documentation requirements. We handle them and give you the records.
A North Bay company since 1932
Family-owned and headquartered in Petaluma, Diamond Certified since October 2016 and BBB Accredited with an A+ rating since December 1995.

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Membership
Ongaro Maintenance Plans
Annual maintenance on your home systems provides safeguards and comfort to you and your family. Members get priority scheduling, discounts, and proactive checkups that catch problems early.
Member Discounts
5% off every repair and replacement, all year long.
Peace of Mind
Proactive checkups catch issues before they become big problems.
Courtesy Reminders
We call you to schedule: never miss a seasonal service.
Value That Lasts
With Ongaro & Sons, you’re investing in quality, integrity, and service that stands the test of time. Explore our current promotions and see the difference real value makes for your HVAC, plumbing, and electrical needs.
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