Commercial Ventilation Design in Orange, CA

What We Design

We engineer high‑performance ventilation systems for commercial buildings in Orange, CA, from new construction to deep retrofits. Our scope spans dedicated outdoor air systems (DOAS), energy recovery ventilators (ERV/HRV), demand control ventilation (CO2), VAV and constant volume strategies, economizers, and advanced sequences of operation that balance indoor air quality with energy efficiency.

• Ventilation load and outdoor air calculations per ASHRAE 62.1
• Title 24 compliance documentation and energy considerations
• Duct layouts, risers, details, and equipment schedules
• Integration with rooftop units (including projects using Lennox RTUs), air handlers, and controls
• Economizer logic, CO2/DCV, purge modes, and setback strategies
• Filtration upgrades (MERV 13+), HEPA options, and air cleaning when applicable
• Noise and vibration considerations for occupant comfort
• Commissioning plans and TAB-ready deliverables

Lennox Integration, Without the Guesswork

Many Orange businesses operate Lennox rooftop units and air handlers. We design ventilation that integrates seamlessly with that equipment—curb adapters, economizer kits, sensor placement, and BACnet-friendly sequences—so your system performs as intended. We work on projects that use Lennox equipment as well as other major OEMs, aligning airflow, static pressure, and control logic to manufacturer specifications and local code requirements.

Compliance and Quality You Can Count On

Our designs meet ASHRAE 62.1 for ventilation and are crafted in line with ASHRAE 90.1 energy principles, California Title 24, and CALGreen. We tailor system zoning and controls to support code compliance while minimizing lifecycle costs. Expect clear submittal packages, inspector-friendly narratives, and commissioning checklists that streamline approvals in the City of Orange and across Orange County.

Industries We Serve

• Office, retail, and mixed‑use fit‑outs
• Restaurants and food service with robust makeup air
• Healthcare clinics and dental practices
• Education and fitness facilities
• Warehouses, light manufacturing, and R&D
• Hospitality and venues with variable occupancy

Our Engineering Process

• Assessment: Site visit or plan review, occupancy profiles, and existing equipment audit
• Modeling: Ventilation and load calculations, zoning strategy, and energy recovery feasibility
• Design Brief: System concept, controls narrative, and equipment compatibility (including projects with Lennox RTUs/AHUs)
• Drawings & Specs: Ductwork, details, schedules, sequences of operation, and Title 24 documents
• Permit Support: Rapid responses to plan check comments and revisions
• Construction Support: RFIs, submittal review, and coordination with GC/MEP
• Commissioning & TAB: Functional performance testing support and as‑built updates

Why #1 AC Guys

We are a 4th‑generation family of engineers with 80+ years in engineering, delivering ventilation solutions for large and complex commercial projects. Our team has completed manufacturer education with Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). We combine meticulous calculations with practical field know‑how, so your design installs cleanly, controls make sense, and comfort and IAQ remain stable across seasons.

Healthy Air, Healthy Business

Our mission is simple: healthy indoor air for healthy, productive teams. We prioritize proper outdoor air, filtration, and control strategies that improve occupant well‑being while reducing energy waste. From MERV 13+ filtration to CO2‑based DCV and ERVs, we tailor solutions to your building’s real‑world operating profile.

Service Area

We proudly serve Orange and all of Orange County, with extended coverage across Los Angeles County, Ventura County, and Western Riverside County. Local codes, climate, and permitting workflows are second nature to us—helping you save time and avoid costly redesigns.

Frequently Asked Questions

Do you work with existing Lennox equipment? Yes—we design ventilation to integrate with projects that use Lennox RTUs and air handlers, aligning airflow, controls, and economizer operations with specifications and code. Can you help with Title 24? Absolutely—our packages include the documentation and narratives required for a smooth plan check. How fast can we start? We offer expedited timelines for Orange, CA projects; share your drawings and we’ll provide a schedule and fee proposal.

• Upgrades to MERV 13+ and DCV can reduce energy while improving IAQ
• DOAS/ERV strategies often lower cooling loads and humidity swings
• Clear sequences of operation simplify commissioning and maintenance

Get Started

Tell us about your project in Orange, CA—new build or retrofit, Lennox or mixed‑brand equipment. We’ll provide a no‑obligation consultation and a right‑sized, code‑compliant ventilation design that’s built for comfort, efficiency, and long‑term reliability with #1 AC Guys.