Commercial Rooftop Unit (RTU) Installation in Ontario, CA – Fujitsu Specialists

Engineered Rooftop HVAC Solutions for Ontario Businesses

At #1 AC Guys, we approach every commercial rooftop unit (RTU) installation as an engineering project first. That means precise load calculations, thoughtful equipment selection, and a plan that protects people, property, and business continuity. When you choose Fujitsu commercial equipment, our factory-trained team ensures seamless integration, optimized airflow, and smart control strategies designed for real-world conditions in Ontario, CA.

Why our factory training matters

Our engineers have trained at manufacturer facilities including Fujitsu in Japan, as well as Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). This hands-on experience helps us apply best practices in refrigeration, inverter technology, control logic, and commissioning to your rooftop project—so the system runs right from day one.

What your RTU installation includes

• Site survey, heat load calculations, and airflow design
• Crane lift coordination, rigging plans, and safety management
• Curb adapters, seismic/roof support review, and weatherproofing
• Electrical disconnects, gas/electric connections (as applicable), and controls wiring
• Economizers, demand-control ventilation, and high-MERV filtration options
• Integration with thermostats, BAS/BMS, and smart building platforms
• Factory-approved start-up, balancing, and performance verification
• Documentation, permits, and code-ready closeout packages

Healthy air is our mission

Healthy indoor air drives healthier teams and better customer experiences. We prioritize ventilation rates, filtration, and proper commissioning to help reduce contaminants and improve comfort. Options include MERV-13+ filtration, dedicated outdoor air strategies, UV-C, and advanced control sequences for clean, stable, and energy-smart operation.

Designed for Southern California performance

Ontario’s hot summers and cool nights demand systems that handle wide temperature swings without sacrificing efficiency. We design rooftop solutions that use economizers for free cooling, inverter-driven capacity where applicable, and thoughtful zoning to reduce energy waste—aligned with California codes and Title 24-informed design practices.

Our process

• Assessment and planning: We review your building, roof, power, ventilation needs, and operational constraints.
• Proposal and timelines: Clear scope, equipment options centered on Fujitsu commercial solutions, and transparent pricing.
• Permits and coordination: We handle documentation and schedule crane lifts to minimize disruption.
• Installation day: Safe rigging, precise placement, leak-free connections, sealed ducts, and neat electrical.
• Commissioning: Factory-informed start-up, airflow balancing, controls tuning, and performance verification.
• Handover and support: Owner training, maintenance plans, and ongoing service to protect your investment.

Industries we serve

Offices, retail and shopping centers, restaurants, clinics, schools and training centers, warehouses, light industrial, and mixed-use buildings. If it has a roof and people inside, we can engineer a better environment.

Fujitsu-forward expertise

Choosing Fujitsu commercial equipment means stable comfort, quiet operation, and intelligent controls. Our team leverages Fujitsu control strategies and best practices to help you capture efficiency, reliability, and life-cycle value from your rooftop installation.

Upgrades and options

• High-efficiency fan motors and variable speed strategies
• CO2 sensors and demand-control ventilation
• Advanced economizer controls and integrated free cooling
• High-MERV and HEPA-ready filtration options
• Smart thermostats, BACnet gateways, and BMS integration

Serving Ontario and Greater Los Angeles

We proudly serve Ontario, CA and the Greater Los Angeles region, including Los Angeles County and nearby areas such as Orange County, Ventura County, and Western Riverside County. As a fourth-generation family business with 80+ years in engineering, we bring big-project capability with the attention and care of a local team.

Transparent pricing and fast scheduling

Expect a clear, line-by-line proposal, realistic timelines, and a dedicated project manager. Need to minimize downtime? We offer phased changeouts and off-hours work to keep your operations running.

Get started today

Ready to upgrade your building with a professional commercial rooftop installation? Contact #1 AC Guys for a site visit and a detailed RTU proposal focused on Fujitsu commercial solutions, healthy air, and lasting efficiency. We make complex jobs simple—and we do them right the first time.

Call now or request your estimate online. Your building’s best air starts here.