Commercial BAS Maintenance in Fullerton, CA

Why Fullerton businesses choose #1 AC Guys

We are a 4th‑generation, family‑owned team of engineers serving Greater Los Angeles and Orange County, including Fullerton. With 80+ years in engineering, we specialize in large and complex commercial controls projects and ongoing maintenance. Our mission is simple: healthier indoor air for a healthier life—delivered through reliable Building Automation performance, stable comfort, and smart energy use.

Our BAS technicians are factory‑trained by Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). That manufacturer‑level insight lets us optimize VRF/heat pump integrations, sequences of operation, and ventilation strategies that many buildings rely on for comfort and air quality.

What our Commercial BAS Maintenance includes

• System health and point‑to‑point verification across controllers, I/O, and network segments.
• Sensor calibration (temperature, humidity, CO2, pressure) and verification of setpoints and deadbands.
• Sequence of operation review and tuning for AHUs, RTUs, VAVs, VRF/heat pumps, DOAS, and exhaust.
• Schedule optimization (occupied/unoccupied, warm‑up/cool‑down) to reduce drift and after‑hours waste.
• Alarm rationalization to cut noise, escalate true faults, and protect uptime.
• Trend log coverage and analytics to detect hunting, overrides, and comfort/IAQ issues.
• Airside checks: economizer enablement, DCV performance, and ventilation rate verification.
• Network and protocol health: BACnet IP/MS‑TP, Modbus TCP/RTU, and LonWorks communications.
• Controller firmware updates, database backups, and graphics cleanup for clarity and speed.
• Cyber hygiene: passwords/roles, audit logs, remote access review, and backup encryption.
• Documentation updates: as‑built points lists, sequence narratives, and control drawings.
• Actionable reporting with prioritized fixes, ROI estimates, and next‑step recommendations.
• Operator coaching so your team can confidently use schedules, overrides, and alarms.

Systems we service

• Automation servers/supervisors and field controllers, VFDs, and smart sensors.
• VRF and heat pump systems from Fujitsu, Mitsubishi Electric, Midea, Gree, and Haier.
• Air handling units (AHU), rooftop units (RTU), fan coils, VAV/FPB boxes, and exhaust.
• Chiller/boiler plants, heat‑recovery, economizers, and demand‑control ventilation.
• IAQ monitoring (CO2, PM2.5, VOCs) integrated to BAS for healthier indoor environments.

Energy, compliance, and IAQ for California facilities

Our maintenance aligns your BAS with California Title 24 best practices by improving scheduling, ventilation verification, and demand response readiness. We support documentation and ongoing commissioning efforts and follow ASHRAE 62.1/55 guidance to balance comfort, IAQ, and energy. The result: fewer complaints, better occupant well‑being, and lower utility spend. We can also help you prepare for utility incentives and retro‑commissioning opportunities available to Fullerton and Orange County facilities.

Service plans and response

• Preventive plans (quarterly/semiannual) tailored to building type, load profile, and occupancy.
• Predictive options with remote monitoring, trend analytics, and alert triage.
• 24/7 emergency response with same‑ or next‑day dispatch in Fullerton.
• Multi‑site portfolio reporting with KPIs for comfort, IAQ, and energy.
• Transparent pricing, safety‑first practices, and warranty‑friendly procedures.

Protocols and platforms we handle

• BACnet (IP and MS‑TP), Modbus (TCP/RTU), and LonWorks networks.
• Niagara N4 and web‑based graphics, dashboards, and alarming.
• Database backups, version control, and change management to protect your investment.

Industries we support in Fullerton

• Corporate offices and campuses
• Education and municipal buildings
• Retail and hospitality
• Light industrial and warehouses
• Healthcare clinics and labs
• Multifamily common areas and amenities

Local coverage you can count on

Based in Greater Los Angeles, we serve Fullerton and all of Orange County, plus Los Angeles County, Ventura County, and Western Riverside County. Our team is sized for fast response while maintaining the craftsmanship and accountability of a family business.

Get a tailored BAS maintenance plan

Let #1 AC Guys tune your Building Automation System for comfort, efficiency, and healthier indoor air. Tell us about your facility, goals, and pain points, and we will deliver a maintenance scope that fits your budget and timeline—no cookie‑cutter checklists, just engineering‑driven results.

Request your free assessment today. We will benchmark your BAS, share prioritized recommendations, and show the savings path before work begins.