Commercial Control Systems in Fullerton

When your building depends on consistent comfort, healthy air, and predictable energy spend, the control system is the heartbeat. In Fullerton and across Orange County, #1 AC Guys delivers commercial HVAC controls that are engineered for accuracy, resilience, and long‑term value. We handle new construction, retrofit, and expansion projects, from a single RTU to campus‑wide BAS networks.

What we deliver

• Design‑build and plan‑spec controls for VRF/mini‑split, VAV, RTUs, DOAS, boilers, and chillers.
• Open‑protocol integration (BACnet, Modbus) for scalable, vendor‑neutral systems.
• Sequences of operation, graphics, trending, alarming, and dashboards.
• Demand‑controlled ventilation, CO2, humidity, and IAQ sensor integration.
• Zoning, scheduling, lockouts, and occupancy‑based optimization.
• Retro‑commissioning, calibration, and performance tuning for existing systems.
• Energy analytics to reduce peak demand and total kWh without sacrificing comfort.

Complex job? That’s our specialty. Our engineering roots help us diagnose hidden issues, streamline sequences, and deliver measurable improvements in comfort, air quality, and energy use.

Platforms, protocols, and integrations

We design around open standards so your facility isn’t locked in. Whether you operate VRF systems or mixed‑equipment plants, we connect assets via BACnet or Modbus, deploy secure gateways, and configure points lists, trends, and alarms that matter to your operation.

Our engineers are factory‑trained by Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). That training informs precise setup, commissioning, and integration practices on those manufacturers’ systems—helping you get the most from your equipment.

Healthy air, comfort, and compliance

Healthy air is our mission. We apply real‑world IAQ strategies: CO2‑based ventilation control, humidity management, filtration and pressurization logic, and outdoor air economizer optimization. The result is cleaner indoor air and steady comfort, with controls aligned to California Title 24 requirements and industry best practices.

We make performance visible through dashboards and reports so facility managers can track comfort, IAQ, and energy in one place.
Clear data. Faster decisions. Better outcomes.

Industries we serve

• Offices, retail, and mixed‑use
• Hospitality and restaurants
• Healthcare clinics and labs
• Schools and universities
• Industrial and light manufacturing
• Houses of worship and community spaces
• Multi‑tenant commercial properties

Our process

• Assessment: Site survey, data review, and goals alignment.
• Design: Control drawings, points lists, and sequences of operation.
• Build: Panel fabrication, wiring, and device deployment.
• Programming: Graphics, trends, alarms, schedules, and integration.
• Commissioning: Functional testing, balancing support, and documentation.
• Handover: Training for your team and clear O&M materials.
• Lifecycle support: Remote monitoring, updates, and preventative maintenance.

Every step is documented and verified, so your system runs as designed—day one and year five.

Service and support

We provide remote monitoring, alarm response, and trend analysis to catch issues early and reduce downtime. Maintenance plans include periodic calibration, firmware updates, and sequence tuning as your building or occupancy changes. We can train your on‑site staff or offer full service—your choice.

Fullerton and beyond

We’re a Southern California family business serving Fullerton and all of Orange County, with extended coverage across Los Angeles County, Ventura County, and Western Riverside County. Whether you manage a single property in downtown Fullerton or multiple sites across the region, we can standardize controls, unify reporting, and streamline operations.

Why #1 AC Guys

• 4th‑generation family of engineers with 80+ years of engineering expertise.
• Factory‑trained by Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China).
• Specialists in large, complex commercial projects.
• Open‑protocol, vendor‑neutral approach to protect your investment.
• Mission‑driven focus on healthy air and dependable comfort.

If you’re planning a new BAS, upgrading legacy controls, or need to fix lingering comfort and IAQ problems, we’re ready to help.

Get a proposal

Tell us about your building, timelines, and goals. We’ll deliver a clear scope, budget options, and a phased plan that minimizes downtime while maximizing performance. Let’s build a control system that keeps your people comfortable, your air healthy, and your energy spend under control—starting in Fullerton.