Commercial Rooftop Unit (RTU) Installation in Downey, CA

Local Expertise, Built Over Four Generations

Based in Los Angeles County, our family business has supported Downey facilities for decades with dependable rooftop HVAC. With 80+ years of engineering experience, we blend precision design with field‑proven installation practices to deliver quieter operation, better comfort, and lower energy spend. Our mission is simple and constant: healthy air indoors for a healthier life—backed by reliable, code‑compliant installs that last.

Turnkey Commercial RTU Installation

We manage the entire process so you can keep your operations running. From initial load calculations to final commissioning, we deliver a seamless, on‑schedule project in Downey and across Los Angeles County.

• On‑site survey and heat/cool load calculations to right‑size equipment and avoid hot/cold spots.
• Equipment selection targeting high IEER efficiency and Title 24 compliance, with economizer options for free cooling.
• Crane lift planning, rigging, and logistics coordination to minimize downtime and disruption.
• Structural review, curb adapters, and seismic anchorage designed for California codes and rooftop conditions.
• Duct transitions, economizer integration, ventilation sizing, and outside air balancing for healthy IAQ.
• Electrical, gas (where applicable), condensate management, smoke/CO detector interfacing, and controls.
• BAS integration, smart thermostats, and demand‑control ventilation for comfort and savings.
• Start‑up, commissioning, and functional testing with documented performance benchmarks.
• Owner training and a tailored maintenance plan to protect your warranty and efficiency.

Permits, Codes, and Safety—Handled

We navigate Downey and Los Angeles County requirements so you don’t have to. Our team manages permit submittals and inspections and installs to current standards, including Title 24 energy requirements, CBC seismic anchorage (ASCE 7), CALGreen best practices, and applicable SCAQMD rules for low‑NOx gas heat sections. We prepare crane lift plans, coordinate traffic and site safety, and follow OSHA-compliant fall protection and lockout/tagout procedures. The result: a safe, fully documented installation.

Factory Training and Multi‑Brand Mastery

Our engineers and installers have trained with leading manufacturers—Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea, Gree, and Haier—giving us a deep understanding of systems, controls, and best practices across diverse rooftops and building types. We service and replace most major commercial rooftop brands and can match performance, footprint, and curb requirements to streamline changeouts.

Ideal for Downey Facilities

• Retail centers and shopping plazas needing reliable comfort for customers and staff.
• Restaurants and food service with ventilation and make‑up air needs.
• Warehouses, light industrial, and flex spaces seeking durable, efficient RTUs.
• Medical/dental offices that prioritize clean, healthy indoor air.
• Schools, houses of worship, and community facilities with varying occupancy loads.
• Multifamily common areas and mixed‑use buildings requiring quiet, efficient operation.

Energy, IAQ, and Lifecycle Savings

Modern RTUs can significantly reduce energy costs and improve indoor air quality. We design systems with high IEER ratings, demand‑controlled ventilation using CO2 sensors, advanced economizers, and smart controls for tighter temperature and humidity management. Filtration options include MERV‑13 and higher, with add‑ons such as enhanced media filtration, UV‑C, or air purification where appropriate. We also advise on utility incentives and rebates when available and ensure your system settings are optimized for real‑world usage—not just lab specs.

Protect your investment with planned maintenance: coil cleaning, filter changes, belt and bearing checks, economizer calibration, and seasonal start‑ups. A well‑maintained rooftop unit runs quieter, lasts longer, and uses less energy.

Project Timeline You Can Count On

• Day 0–2: On‑site assessment in Downey, roof walk, measurements, and load calculations.
• Day 2–4: Detailed proposal with equipment options, scope, and firm timeline.
• Days 4–10: Permit submittal and procurement (timelines vary by jurisdiction and equipment availability).
• Install Day: Crane set, curb/adapter work, rigging, connections, startup and commissioning.
• Post‑Install: Final inspection, owner training, and maintenance plan setup.

Proudly Serving Downey and Nearby

We focus on Downey and surrounding communities—Norwalk, South Gate, Bellflower, Pico Rivera, Paramount, Whittier, and beyond—throughout Los Angeles County. Our service area also includes neighboring Orange County, Ventura County, and Western Riverside County for multi‑site operators and regional projects.

Get Your RTU Quote

Ready to upgrade or replace a rooftop unit in Downey? Contact #1 AC Guys for a fast, no‑pressure site visit and a clear, code‑compliant plan. We specialize in large and complex commercial projects and deliver the healthy, efficient air your business deserves.