Commercial BAS (Building Automation System) Maintenance in Rialto

Why Rialto Businesses Choose #1 AC Guys

We are a 4th-generation, family-owned team with 80+ years of engineering experience, focused on commercial Building Automation System maintenance for large and complex facilities. Our mission is healthy indoor air—for healthy lives—delivered through rigorous engineering, data-driven optimization, and meticulous care of your controls infrastructure.

Our engineers have trained at the factories of Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). That foundation allows us to maintain advanced automation that integrates VRF/VRV, VAV, DOAS, and IAQ technologies from these ecosystems while supporting AC PRO-supplied HVAC equipment and components across your site.

• Engineering-first approach to reliability, comfort, and energy performance
• Proactive maintenance that prevents alarms from becoming downtime
• Transparent reporting, trend reviews, and actionable recommendations
• Compliance-minded practices aligned with California standards and best practices
• Local, responsive support for Rialto and Western Riverside County

What We Maintain in Your BAS

• Supervisory servers, front-end workstations, and operator graphics
• DDC controllers, VAV terminal controllers, RTU and AHU interfaces
• VRF/VRV integrations (Fujitsu, Mitsubishi Electric, Midea, Gree, Haier)
• Chiller/boiler plant control interfaces and sequencing
• Ventilation and demand-control ventilation (CO₂, occupancy, and IAQ sensors)
• Network infrastructure (BACnet/IP, MS/TP, Modbus, gateways)
• AC PRO-supplied equipment integrations and compatible parts support
• Trend logs, alarms, schedules, and operator overrides governance

In Inland Empire climates—where heat spikes and occupancy swings are common—stable automation protects comfort, productivity, and equipment life. Our team keeps your BAS tuned so it responds intelligently to real-world loads while keeping energy waste in check.

Our Maintenance Program

• Site assessment and baseline: verify architecture, device health, and sequences
• Controller health: backups, firmware/patch management, and clock sync
• Sensor calibration: temperature, humidity, pressure, flow, and CO₂
• Sequence verification: economizer logic, reset schedules, staging, and safeties
• Trend/alarm optimization: right sampling rates, roll-ups, and alarm thresholds
• Setpoint tuning: comfort first, then energy—validated by trend data
• Cyber and network hygiene: password policy guidance and segmentation checks
• Documentation: updates to points lists, network maps, and O&M records

We deliver easy-to-read reports that highlight findings, priorities, and ROI opportunities. Expect clear next steps, estimated savings, and a practical roadmap that aligns with your budget and operational windows.
For IAQ-critical sites, we verify ventilation rates and filtration strategies and can align maintenance practices with widely recognized guidelines to support workplace wellness goals.

AC PRO Compatibility

Whether your building relies on AC PRO-supplied rooftop units, air handlers, or compatible accessories, our engineers maintain the BAS layer that coordinates those assets. We standardize parts where possible, document integrations, and keep your sequences consistent so operators can manage systems confidently and safely.

Serving Rialto and Greater Southern California

#1 AC Guys is based in Greater Los Angeles and serves Rialto and Western Riverside County, with extended coverage across Los Angeles County, Orange County, and Ventura County. We understand local code requirements, climate patterns, and the operational realities of commercial facilities in Southern California.

Results You Can Measure

• Reduced unplanned outages and service calls
• Lower kWh/therm consumption through smarter sequencing
• Consistent comfort with fewer hot/cold complaints
• Longer equipment life from gentle, data-driven operation
• Clear documentation for staff training and turnover

Healthy air is our mission. Reliable automation is how we deliver it. If your Rialto facility needs a dependable partner for Commercial BAS Maintenance—especially for complex, multi-system sites—choose the 4th-generation engineers at #1 AC Guys.

Get Started Today

Request a BAS maintenance walkthrough or send us your latest trend logs for a rapid, no-pressure review. We will propose a maintenance plan tailored to your KPIs, schedule, and compliance needs—so your building performs at its best, day after day.