Commercial AC PRO Rooftop Unit (RTU) Installation in Ontario, CA

When uptime, safety, and occupant comfort matter, Ontario businesses rely on #1 AC Guys for AC PRO rooftop unit (RTU) installation and replacement. We combine advanced engineering with field‑proven practices to deliver durable, efficient systems that meet Title 24 and ASHRAE standards while controlling total cost of ownership.

What We Install

We design and install commercial AC PRO RTUs for new construction, tenant improvements, and replacements, including heat pump and gas/electric configurations, 3–50 tons, single or multi‑zone with economizers, VFD fan control, and curb adapter solutions for fast change‑outs.

Engineering‑First Approach

• Right‑sizing via Manual N/ACCA‑based load calculations for efficiency and comfort
• Duct static pressure analysis to protect fans and airflow
• Electrical calculations, new disconnects, and code‑compliant wiring
• Seismic anchorage, curb adapters, and weatherproofing for the roof system
• Commissioning: airflow balancing, refrigerant charge verification, controls tuning

Healthy Indoor Air by Design

Our mission is healthy air for healthy lives. From day one we address filtration and ventilation so your RTU supports occupant well‑being and productivity.

• MERV‑13 filters for fine particulate capture
• CO2‑based demand‑controlled ventilation (ASHRAE 62.1)
• Economizers for free cooling and improved ventilation
• Optional UV‑C for coil cleanliness and maintenance reduction

Fully Managed Installation

• Permits and compliance: Title 24, CALGreen, local jurisdiction requirements
• Crane day coordination and safety plan
• Curb adapters and sheet metal transitions to fit existing roof openings
• Duct sealing, insulation upgrades, and leakage reduction
• Startup, test, and document: trend logs, commissioning reports, photos

Controls and BAS Integration

We integrate AC PRO RTUs with smart thermostats and building automation systems. Expect precise scheduling, alarms, remote access, and energy reporting. For multi‑unit sites, we standardize control strategies to reduce peak demand and maintenance complexity.

Why AC PRO RTUs for Ontario

• Solid performance in Inland Empire heat with robust coils and fan options
• Broad parts availability across Southern California for reduced downtime
• Economizer and DCV options to meet California energy codes
• Flexible curb adapter kits for fast, clean change‑outs

Industries We Serve

• Retail, restaurants, and hospitality
• Office buildings and medical suites
• Warehouses, light industrial, and flex spaces
• Education, houses of worship, and multi‑tenant

Our Process

• Assessment: site walk, roof survey, and load calculations
• Proposal: clear scope, options, and timelines
• Engineering: submittals, permits, structural and electrical coordination
• Installation: crane lift, curb adapter, duct/electrical, gas/condensate
• Commissioning: airflow, charge, controls, and owner training

Energy and Compliance

We align your installation with Title 24 requirements, economizer logic, ventilation rates, fault detection where applicable, and high‑efficiency fan control. Ask about utility incentives and tax advantages for qualified efficiency upgrades.

Aftercare and Maintenance

Protect your investment with proactive service. Our commercial maintenance plans include seasonal tune‑ups, filter programs (MERV‑13 available), coil cleaning, economizer testing, and IAQ checks—reducing energy spend and preventing downtime.

Our Credentials

#1 AC Guys is a 4th‑generation family of engineers with 80+ years in engineering. Our team is factory‑trained at Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). We specialize in large and complex commercial HVAC projects and apply that rigor to every RTU job.

Service Area

Local to Ontario, CA and the Inland Empire, we also serve Los Angeles County, Orange County, Ventura County, and Western Riverside County, including nearby cities such as Rancho Cucamonga, Upland, Chino, Eastvale, Pomona, and surrounding areas.

Get a Precise Quote

Need an AC PRO RTU installed or replaced with minimal disruption? Contact #1 AC Guys for a professional assessment and a turnkey plan—design, permits, crane, installation, and commissioning handled by specialists committed to healthy air, efficiency, and reliability.

• Fast change‑outs with curb adapters and coordinated crane lifts
• Commissioned performance with documented airflow and charge
• Smart controls and BAS integration for multi‑site fleets
• Clear communication, on‑time delivery, and dependable warranties