Lennox Commercial Rooftop Unit (RTU) Installation in Los Angeles

When your Los Angeles facility needs a Lennox rooftop unit (RTU) replacement or a new installation, you want a partner who treats HVAC as engineering, not guesswork. At #1 AC Guys, our 4th‑generation family team brings 80+ years of engineering experience to every commercial RTU project—so your system runs efficiently, complies with code, and supports healthier indoor air.

Why businesses choose #1 AC Guys for Lennox RTUs

We specialize in large and complex commercial jobs, from multi‑tenant buildings to distribution centers and national retail rollouts. Our engineers have been factory‑trained by Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China), and we apply the same disciplined approach to installing and integrating Lennox packaged rooftop units to manufacturer specifications.

• Engineering‑led design: load calculations, ventilation strategy, and equipment selection
• Code and permit readiness: Title 24, CBC seismic anchorage, and local AHJ requirements
• Low‑downtime execution: coordinated crane lifts, curb adapters, and phased changeouts
• IAQ first: MERV‑13 filtration options, economizers, and demand‑controlled ventilation
• Seamless controls: BAS integration, sensors, and commissioning reports

Our step‑by‑step RTU installation process

1) Site survey and assessment: We document roof structure, electrical and gas services, duct and curb dimensions, and access for lifts. We also evaluate ventilation and economizer opportunities to capture energy savings and improve indoor air quality.
2) Design and equipment matching: We right‑size the Lennox RTU and accessories (economizer, curb adapter, hail guards, CO2 sensors) based on loads and code. We prepare submittals and permit documentation to keep your project moving.
3) Project coordination: Our team schedules crane day, traffic control as required, and tenant notifications. We plan cutovers to minimize business interruption, including off‑hours or weekend work when needed.
4) Removal and rigging: Old equipment is safely recovered and recycled. We prepare and seal the curb, install adapters, and set the new Lennox unit with precision rigging and alignment.
5) Connections and startup: Electrical, gas, condensate, and controls are connected per manufacturer specs. We configure economizers, airflow, and sensors, then perform startup, test and balance, and commissioning checks.
6) Handover and documentation: You receive as‑built drawings, O&M materials, and a commissioning summary so your facilities team knows exactly how to operate the system.

Options and integrations

• MERV‑13 filtration and IAQ upgrades to support healthier indoor environments
• Economizers, DCV via CO2 sensors, and advanced ventilation control
• BAS integration (BACnet/Modbus as available) and smart thermostats
• Seismic bracing and curb reinforcement per Los Angeles requirements
• Energy‑saving strategies aligned with Title 24 and utility programs

We are experienced with popular Lennox commercial rooftop product families and accessories and install them to manufacturer specifications. If you’re planning a model changeout, we can fabricate or procure the correct curb adapter to avoid roofing modifications and keep timelines tight.

Compliance, safety, and documentation

Los Angeles projects demand tight compliance. We prepare permit‑ready packages, coordinate inspections, and design to Title 24, CALGreen, and CBC seismic requirements. On occupied sites, we implement safety plans, fall protection, and debris control—keeping your tenants and customers safe while we work.

Who we serve

• Office, medical office, and mixed‑use buildings
• Retail and restaurants, including national brands
• Industrial and warehouse facilities
• Schools, houses of worship, and civic spaces
• Property managers, building owners, and general contractors

Aftercare and ongoing value

Your new Lennox RTU is only as good as its maintenance. We offer planned maintenance to protect efficiency, stabilize temperatures, and extend equipment life. We assist with manufacturer warranty registration per published guidelines and provide seasonal tune‑ups, filtration changes, coil cleaning, and economizer validation to keep your savings on track.

Service area

We serve Los Angeles County daily and also cover nearby Orange County, Ventura County, and Western Riverside County. Whether you need a single RTU replacement or a multi‑site rollout, our team scales to meet your schedule and budget.

Healthy air is our mission

Comfort is only part of the story. Our mission is healthy air for healthy lives. We design Lennox RTU systems with the right ventilation rates, filtration upgrades, and control strategies so occupants breathe cleaner air—and your organization benefits from improved comfort and productivity.

Get a fast, engineering‑grade quote

Tell us about your project—tonnage, roof access, current issues, and timeline—and we will provide a clear scope, options, and a dependable schedule. #1 AC Guys brings fourth‑generation expertise and 80+ years in engineering to deliver Lennox commercial RTU installations that are efficient, compliant, and built to last.