Commercial Lennox Rooftop Unit (RTU) Installation in Rialto

When it’s time to install or replace a commercial rooftop unit in Rialto, you need an HVAC partner who treats your building like a system—not a box swap. #1 AC Guys delivers engineering‑first Lennox RTU installations that improve comfort, reduce operating costs, and elevate indoor air quality while keeping your operations on schedule.

Why choose Lennox rooftop units for Rialto facilities

Lennox commercial RTUs offer dependable performance, strong efficiency options, and robust economizer and ventilation features that fit California’s climate and codes. Whether your priority is cost‑effective comfort for a retail space or high‑efficiency operation for a large warehouse, we select and configure the right Lennox model, accessories, and controls to meet your usage profile and budget.

• Energy‑smart configurations: economizers, demand‑controlled ventilation, and high‑efficiency options.
• Flexible curb and adapter solutions for clean retrofits with minimal roof disturbance.
• Reliable comfort, quieter operation, and improved air distribution when paired with proper ducting and balancing.

Our engineering‑driven RTU process

• Discovery and site survey: roof access, structural considerations, electrical and gas, duct layout, and existing curb sizing.
• Right‑sizing via load calculations (ACCA/ASHRAE methods) to match real occupancy, solar exposure, and ventilation needs.
• Equipment selection: Lennox capacity, efficiency tier, economizer type, filtration level, and controls strategy.
• Curb adapter design and crane plan to streamline the swap with safe, efficient rigging.
• Permitting with the City of Rialto and coordination with inspectors for a smooth approval.
• Electrical, gas, and condensate upgrades to current code and manufacturer specifications.
• Commissioning: airflow balancing, controls calibration, economizer setup, and performance verification.
• Training and turnover: system orientation, filter schedule, and maintenance guidance for your team.

Healthier air is our mission

Cleaner air supports healthier lives and more productive workspaces. We integrate higher‑MERV filtration options, proper outside air rates per ASHRAE 62.1, and well‑tuned economizers to maintain ventilation while managing energy use. For sensitive environments, we can discuss advanced IAQ upgrades such as dedicated ventilation strategies or UV‑C accessories where appropriate.

What to expect on installation day

Our crew arrives prepared with a clear schedule to minimize disruption:

• Safety briefing and site protection.
• Crane arrival and rigging checks.
• Old unit lift‑off and proper disposal; curb adapter set.
• New Lennox RTU lift‑in, securement, and weatherproofing.
• Electrical, gas, controls, and economizer connections.
• Startup, commissioning, balancing, and final walkthrough.

You’ll receive a concise closeout package with settings, filter specs, and maintenance recommendations so your team can keep the system running at peak performance.

Compliance, safety, and documentation

We align installations with California Title 24 energy standards and local AHJ requirements. Our documentation can include nonresidential mechanical acceptance testing where required, economizer functional tests, and ventilation verification. We also prioritize roof protection, fall safety, and clean job sites that respect your operations and tenants.

Complex projects are our specialty

From multi‑zone offices and restaurants to distribution centers, our fourth‑generation engineering roots help us solve tough constraints—limited roof access, tight timelines, unusual curb sizes, and challenging duct layouts. Our team has trained at the factories of Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China), and we bring that disciplined approach to every Lennox rooftop unit we install or replace.

Transparent costs and lifecycle value

We provide clear proposals that weigh first cost against ongoing utility savings, filter and service intervals, and control strategies that prevent energy drift. Where applicable, we help you navigate utility incentives and configure economizers and demand‑controlled ventilation to unlock additional savings while maintaining code‑compliant fresh air.

Service area

We proudly serve Rialto and the broader Inland Empire, as well as Los Angeles County, Orange County, Ventura County, and Western Riverside County. If you manage multiple sites across these regions, we can coordinate phased RTU replacements to limit downtime and maximize consistency.

Get a fast, engineered quote

Ready to upgrade or install a Lennox commercial rooftop unit in Rialto? Contact #1 AC Guys for an on‑site assessment. We’ll verify load, ventilation, and controls, then deliver a right‑sized plan, a firm timeline, and a clean installation that protects your roof and your business. Healthy air, reliable comfort, and professional execution—engineered by a family team with 80+ years of experience.

Note: We install, replace, and commission Lennox commercial RTUs in accordance with manufacturer specifications and local code requirements.