Pasadena Commercial Lennox Rooftop Unit (RTU) Installation

Engineered RTU Design and Installation

Every Pasadena building is unique. We start with detailed load calculations, roof assessments, and airflow targets to right‑size your Lennox rooftop unit (RTU). Our engineers evaluate curb dimensions, duct transitions, gas and electrical service, condensate routing, and controls so the final system meets performance and code—without costly surprises.

We design around Title 24 efficiency, economizer strategies for free cooling, demand‑controlled ventilation, and proper filtration to support healthier indoor air. When footprint changes are required, we fabricate or specify curb adapters to fit your new Lennox RTU to the existing roof opening—keeping penetrations sealed and watertight.

Lennox RTUs for Commercial Buildings

Lennox rooftop units are a proven choice for Pasadena offices, retail, restaurants, schools, and light industrial spaces. We install and replace Lennox RTUs ranging from light commercial tonnages to larger multi‑zone systems, integrating advanced economizers, variable fan operation, and smart thermostats or BAS connections as your project requires. Our goal is the best lifecycle value—stable comfort, high reliability, and controlled energy costs.

Our Commercial RTU Process

• Site survey and engineering: heat load, airflow, and roof structure review
• Scope and proposal: options for efficiency, IAQ, and controls
• Permitting: mechanical, electrical, and crane logistics with the city
• Change‑out plan: night/weekend scheduling to minimize downtime
• Crane day: safe lift, curb adapter placement, and precise rigging
• Connections: gas, electrical, condensate, duct transitions, and sealing
• Startup and commissioning: refrigerant verification, airflow balance, economizer setup
• Turnover and training: control walkthrough, maintenance plan, documentation

From traffic control to roof protection and debris removal, we manage the details so your business can keep moving. Our crew works cleanly and safely, coordinating with property managers, tenants, and building engineers.

Compliance, Safety, and Quality

We install to Pasadena’s mechanical and electrical codes and follow California Title 24 requirements. Expect proper seismic anchoring, gas pressure verification, electrical disconnects, smoke detector and economizer integration where required, and weather‑tight curbs and penetrations. We commission each Lennox RTU so fan speeds, airflow, and ventilation targets match design intent.

Quality is engineered into every step—documented checklists, photos, and test data that give you confidence your RTU will run efficiently through peak summer heat.

Healthy Air, Better Workplaces

Our mission is healthy indoor air for a healthier life. We advise on filtration upgrades, ventilation strategies, and smart controls that improve comfort and productivity. Ask about MERV upgrades, air quality monitoring, and maintenance plans tailored to your building’s operating schedule.

Service Area

Based in Los Angeles, we proudly serve Pasadena and surrounding communities throughout Los Angeles County, as well as nearby Orange County, Ventura County, and Western Riverside County. Whether you manage a single property in Pasadena or a multi‑site portfolio across Southern California, #1 AC Guys can standardize specs and service for consistent results.

What to Expect on Your Pasadena Lennox RTU Project

• Engineer‑led planning that fits your budget, schedule, and roof conditions
• Crane, curb adapter, and rigging coordinated for safe, timely change‑outs
• Economizer and controls tuned for comfort and energy savings
• Clean, code‑compliant workmanship with documented commissioning
• Flexible scheduling to reduce business interruption

We’re a fourth‑generation family of engineers with 80+ years of engineering experience. Our team is factory‑trained by Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). We leverage that engineering rigor on every Lennox rooftop installation we perform in Pasadena.

Replacement or New Install—We’ve Got You Covered

Replacing an aging RTU? We match capacity to current loads, address ventilation and filtration gaps, and improve controls so your new Lennox unit delivers measurable gains. Building out a new space? We collaborate with your architect and GC to coordinate roof penetrations, power, gas, and duct routing—reducing rework and change orders.

FAQs

• How long does a typical RTU change‑out take?
  Most one‑for‑one replacements can be completed in a single scheduled window (often a night or weekend) once permits and logistics are set.
• Can you integrate with our building automation system?
  Yes—we can tie Lennox RTUs into common BAS platforms or provide smart thermostat solutions for multi‑zone control.
• Do you handle permits and cranes?
  Yes—our team manages permits, inspections, and crane coordination with the city and property.

Get an Engineer‑Led Quote

Ready to upgrade your Pasadena building with a Lennox rooftop unit? Connect with #1 AC Guys for a site walk and proposal. You’ll get clear options, firm scheduling, and a high‑performing system installed by commercial HVAC engineers who stand behind their work.