Commercial Variable Air Volume (VAV) Box Repair in Rialto

When a VAV terminal fails, entire zones go out of balance—hot and cold spots spread, energy costs spike, and comfort complaints rise. #1 AC Guys brings an engineer‑led approach to Commercial VAV Box Repair in Rialto, delivering fast root‑cause diagnostics and precise corrective work that restores stable airflow, proper reheat, and reliable control.

What we repair and optimize

• Damper and actuator issues: seized blades, failed motors, misaligned linkages, or lost end‑stops
• Reheat circuits: electric elements, hydronic valves, control relays, and high‑limit safeties
• Sensors and controls: airflow/temperature sensors, terminal controllers, thermostats
• Airflow calibration and balancing: set design CFM, verify static pressure, tune minimums/maximums
• Noise and vibration reduction: duct transitions, insulation, and terminal isolation fixes
• BAS/DDC integration: BACnet/LonWorks addressing, trending, point mapping, and sequences
• Pneumatic to DDC conversions: smart retrofits that improve accuracy and visibility
• Leak and heat loss points around terminal boxes: sealing, insulation, and gasket repairs

Our commercial VAV repair process in Rialto

• Discovery and safety: review complaints, AHU data, and site access; lockout/tagout as required
• Diagnostics: verify thermostat and BAS commands, check damper travel, test actuators and sensors
• Airflow assessment: traverse readings, pitot or hood verification, and static pressure checks
• Thermal and electrical testing: reheat circuit verification, valve actuation, and breaker/fuse checks
• Controls analysis: trend logs, setpoint review, occupancy modes, and sequence of operations
• Clear estimate: prioritized scope with options for repair, retrofit, or optimization
• Repairs and calibration: component replacement, tuning of CFM setpoints, trim‑and‑respond setup
• Commissioning and reporting: before/after data, updated labels, and recommendations

Engineer‑led advantages for complex sites

Large campuses and specialized facilities demand deeper engineering rigor. With 80+ years of engineering experience across four generations, our team thrives on complex VAV systems, mixed control platforms, and tight downtime windows. We coordinate with facility managers, GC/MEP teams, and building automation vendors to keep operations smooth and compliant.

• Multi‑zone office towers and corporate campuses
• Healthcare, labs, and clean‑sensitive environments
• Education buildings and auditoriums
• Distribution centers, high‑bay warehouses, and retail

Healthier indoor air and documented results

Our mission is healthy air for a healthy life. Every VAV repair considers ventilation effectiveness and indoor air quality, aligning with ASHRAE 62.1 guidance and California Title 24. We help validate minimum ventilation rates, eliminate stratification, and reduce drafts—then document the improvement so your team can track performance.

• Better thermal comfort and fewer hot/cold complaints
• Improved ventilation control and IAQ metrics
• Energy savings through correct minimums and reheat control
• Actionable reports for your BAS and maintenance plans

Controls and BAS expertise

Whether your VAVs are standalone or integrated with a BAS, we resolve address conflicts, failed IO, sequence gaps, and sensor drift. We trend key points, rationalize setpoints, and implement practical strategies like trim‑and‑respond, occupancy scheduling, and supply static reset to match your air handler capabilities.

• BACnet/LonWorks device and point verification
• Controller replacement and firmware updates (where applicable)
• Recommissioning of terminal sequences and setpoints
• DDC tuning for minimum/maximum CFM and reheat staging

Training and craftsmanship

Our technicians are factory‑trained by Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). That manufacturer training, combined with our multi‑decade engineering background, helps us solve problems quickly and correctly on demanding commercial systems.

When to call us

• Zones swing between too hot and too cold or never reach setpoint
• Airflow is weak, noisy, or surges unexpectedly
• BAS alarms on low/high CFM, damper faults, or reheat failures
• Reheat trips breakers or hydronic valves fail to modulate
• Energy bills climb despite no major occupancy changes
• Frequent comfort complaints from a specific floor or zone

Service area and availability

#1 AC Guys is based in Los Angeles and serves Los Angeles County and nearby areas—including Rialto, plus parts of Orange County, Ventura County, and Western Riverside County. We offer coordinated scheduling, after‑hours options by arrangement, and clear communication from start to finish.

Get a quote for Commercial VAV Box Repair in Rialto

Keep your building’s zones stable, efficient, and healthy. Contact #1 AC Guys to schedule expert Commercial VAV Box Repair in Rialto. We’ll investigate quickly, repair precisely, and provide commissioning data you can trust—so your facilities team can focus on what’s next.

From emergency fixes to planned retrofits, our engineer‑led crew is ready to restore comfort and control across your VAV system—one terminal at a time.