Commercial Rooftop Unit (RTU) Installation in Fontana

#1 AC Guys specializes in Commercial Rooftop Unit (RTU) installation for Fontana businesses that demand reliability, efficiency, and long‑term value. As a family‑owned company built by 4th‑generation engineers with 80+ years of engineering background, we excel at large and intricate projects where design details and code compliance matter most. Our mission—healthy air for healthy life—drives every step, from load calculations to final commissioning.

Engineering‑Led, End‑to‑End RTU Delivery

We manage the entire RTU lifecycle so you don’t have to coordinate multiple vendors.
• Site assessment and load calculations
• Design–build and value engineering
• Permitting and Title 24 documentation
• Crane logistics and safety planning
• Seismic curbs, rigging, and anchorage
• Electrical, gas, and condensate connections
• Duct transitions, economizers, and IAQ upgrades
• Controls and BAS integration
• Airflow balancing and commissioning

Factory‑Trained Specialists

Our installers and commissioning engineers are factory‑trained at the manufacturing plants of Fujitsu (Japan), Mitsubishi Elektrik (Thailand), Midea (China), Gree (China), and Hier (China). That means your RTU is set up per manufacturer best practices—improving performance, dependability, and warranty protection.

Code Compliance and Safety

We deliver fully compliant installations aligned with California codes and industry standards, including Title 24 energy requirements, proper economizer control, ventilation targets, and seismic anchorage. Our team plans crane lifts with detailed job hazard analyses and coordinates with property management to protect operations and public safety.

Indoor Air Quality that Supports Productivity

Healthy workplaces depend on clean, properly ventilated air. We engineer IAQ solutions that help safeguard employees and customers:

• MERV‑rated filtration and filter rack upgrades
• Fresh air ventilation aligned with project requirements
• Demand‑controlled ventilation with CO2 sensors
• Economizers for free cooling and energy savings
• Humidification/dehumidification strategies where needed

Controls, BAS, and Optimization

We integrate RTUs with existing thermostats or building automation systems, ensuring proper staging, setpoints, and schedules. If your facility needs trend logging, alarms, or remote access, we configure controls to keep comfort steady and costs predictable.

Replacement or New Construction

Whether you’re replacing an aging rooftop unit or building new, we design the right solution for footprint, airflow, fuel, and electrical requirements. Our team can match curb sizes, fabricate transitions, and phase work to minimize downtime. For replacements, we can often perform crane lifts and changeouts off‑hours to reduce impact on customers and staff.

Industries We Serve in and Around Fontana

• Retail, restaurants, and hospitality
• Warehouses, logistics, and light industrial
• Office and medical suites
• Schools and places of worship
• Mixed‑use and multi‑tenant properties

Transparent Proposals and Clear Timelines

You’ll receive a detailed scope of work, equipment selections, and a clear schedule. We coordinate permits, crane windows, and inspections to keep your project moving. Our goal is to deliver a smooth, predictable experience—on time and on budget.

Why #1 AC Guys

• 4th‑generation, family‑owned, engineering‑driven
• 80+ years of engineering expertise applied to HVAC
• Factory‑trained at Fujitsu, Mitsubishi Elektrik, Midea, Gree, and Hier
• Design–build capability for complex commercial projects
• Title 24 compliance, IAQ upgrades, and energy optimization

Service Area

Based in Los Angeles, we proudly serve Fontana and nearby Southern California communities through our regional service network, including Los Angeles County and adjacent areas such as Orange County, Ventura County, and Western Riverside County.

Get a Site Visit and Quote

Ready to upgrade your commercial rooftop HVAC? Contact #1 AC Guys to schedule a site assessment for your Fontana property. We’ll evaluate loads, recommend the right RTU, plan crane logistics, and provide a clear, code‑compliant path from permit to punch‑list—so you can focus on running your business.