Commercial Rooftop Unit (RTU) Installation in Orange, CA

Local Expertise, Regional Strength

As a Los Angeles based, fourth-generation family business, #1 AC Guys delivers Commercial Rooftop Unit Installation in Orange with the responsiveness local businesses expect and the resources larger projects require. Our teams regularly work in the City of Orange and throughout Orange County, coordinating permits, inspections, and logistics unique to rooftop AC replacements and new construction. We specialize in complex, multi-unit roofs and mission-critical spaces where uptime and indoor air quality matter.

End-to-End RTU Installation

We manage the complete process from first site visit to final sign-off, so you have one accountable partner.

Assessment: On-site survey, roof access review, existing equipment documentation, and detailed load and airflow evaluation.
Engineering: Right-sizing based on building use, duct design checks, curb adapter design, economizer strategy, and energy modeling for code compliance.
Permitting: Coordination with the City of Orange for mechanical, electrical, and structural requirements, plus Title 24 documentation as needed.
Removal and Rigging: Safe crane picks, traffic and pedestrian controls, and clean removal of old units and debris.
Installation: Precision setting of new RTUs, curb adapters, duct transitions and sealing, gas and condensate routing, and electrical terminations.
Controls: Thermostat or BAS integration, sensor placement, BACnet or open-protocol connectivity when specified.
Commissioning: Start-up, airflow and static verification, economizer calibration, refrigerant charge verification, and owner training with turnover documents.

Engineering That Pays Off

We apply industry-standard calculations and practical field experience to make sure your rooftop unit performs as promised. Proper capacity selection prevents short cycling and hot-cold spots. Economizers and demand-controlled ventilation with CO2 sensors lower operating costs while maintaining fresh-air targets. When appropriate, we deploy variable-speed fan strategies, low-leakage curbs, and advanced filtration to meet comfort and energy goals. The result is a system that is easier to maintain, costs less to run, and supports healthier indoor air.

Safety, Permits, and Code Compliance

Every installation is planned around California Building and Mechanical Codes, the National Electrical Code, and Title 24 energy standards. We address seismic anchorage, gas piping and shutoffs, condensate drainage, smoke detector interlocks when required, and labeling so inspectors can approve without delays. Our job plans aim to protect your staff, customers, and property while keeping your project on schedule.

Crane, Rigging, and Roofing Coordination

Rooftop unit projects succeed or fail in the details. We develop lift plans, coordinate street access, and work with your roofer to preserve warranties, integrate new curbs correctly, and maintain proper flashing. Our crews protect roof membranes, manage debris, and leave the site clean and ready for business.

Controls and Commissioning

Whether you need a smart thermostat or full BAS integration, we configure controls for stable comfort and visibility. Commissioning includes verifying supply and return airflow, tuning economizer operation, checking electric heat or gas heat performance, validating sensor calibration, and documenting set points. Expect a complete start-up report and owner guidance so your team can operate the system confidently from day one.

Healthy Indoor Air

Our mission is healthier air for healthier lives. We can incorporate MERV 13 filtration where feasible, enhanced ventilation strategies, UV-C options, and coil protection to help reduce contaminants and maintain cleaner systems. We balance IAQ improvements with energy targets so you do not sacrifice efficiency for comfort.

Industries We Serve

Retail and shopping centers, restaurants and hospitality, offices and creative spaces, warehouses and light industrial, medical and dental clinics, schools and places of worship, and multi-tenant buildings. From single-package replacements to multi-RTU change-outs with staging plans, we tailor the work to your occupancy and timelines.

Brands and Training

Our engineers have factory training experience with Fujitsu, Mitsubishi Electric, Midea, Gree, and Haier, and we are experienced with major RTU OEMs across the market. That background helps us integrate equipment, economizers, and controls effectively and troubleshoot quickly when conditions are challenging.

Transparent Proposals and Scheduling

We provide clear scopes, model selections, crane plans, curb adapter details, and commissioning deliverables up front. You will see what is included and the timeline to complete. We can coordinate phased work to reduce downtime and plan installations to limit impact on tenants and customers.

Service Area

Primary focus for this service page is the City of Orange and nearby communities such as Anaheim, Santa Ana, Tustin, Garden Grove, Irvine, and Fullerton. As a Southern California company, we also serve Los Angeles County, Ventura County, and Western Riverside County.

Request Your Commercial RTU Quote

Ready to replace an aging rooftop AC or design a new system? Contact #1 AC Guys for a site assessment and a no-pressure proposal. Our fourth-generation team brings 80+ years of engineering know-how to every Commercial Rooftop Unit Installation in Orange, delivering code-compliant results, healthier indoor air, and dependable comfort for your business.