Commercial AHU (Air Handling Unit) Repair in Pasadena

When a commercial Air Handling Unit underperforms, the whole building feels it—comfort drops, energy costs rise, and indoor air quality declines. #1 AC Guys brings four generations of engineering rigor to every Pasadena AHU repair, combining deep mechanical, electrical, and controls expertise with an unwavering mission: healthier air for healthier lives.

What we repair in your AHU

• Fan systems: belt and direct‑drive fans, fan arrays, bearings, shafts, alignment, vibration issues
• Motors and drives: motor testing/replacement, soft starters, VFD programming, harmonics mitigation
• Coils and heat exchangers: chilled water, hot water, DX coil leaks, fouling, freeze protection, condensate management
• Airflow and economizers: dampers, actuators, linkages, outside air calibration, economizer logic, relief/exhaust balance
• Filtration and IAQ: MERV/HEPA upgrades, filter racks, pressure drops, UV‑C setups, cleanability
• Sensors and controls: temperature, humidity, CO2, pressure sensors; safeties; sequence tuning; BMS integration
• Casings and sections: access doors, insulation, liners, drain pans, leaks, microbial growth mitigation

AC PRO compatibility and parts access

We frequently service AHUs and rooftop systems built with AC PRO‑sourced components and accessories. Our team understands the form factors and performance specs common to AC PRO distribution, helping us identify equivalent parts fast and reduce downtime. We are an independent service provider and can repair or retrofit using AC PRO‑sourced items or owner‑preferred components to meet your standards and budget.

Our diagnostic and repair process

• Intake and history: symptoms, alarms, energy spikes, prior service notes
• Root‑cause diagnostics: electrical testing, airflow/CFM verification, static pressure profiles, leak checks, control sequence review
• Targeted repair: precision mechanical work, coil cleaning or replacement, drive tuning, damper/actuator repair, sensor replacement
• Controls optimization: economizer logic, reset strategies, occupancy scheduling, safe BMS handoff
• Performance verification: trend logs, delta‑T, kW draw, vibration/balance, IAQ baselines
• Documentation and guidance: photo reports, recommendations for preventive care and energy savings

Engineered for compliance, safety, and longevity

Repairs are aligned with ASHRAE 62.1/90.1, California Title 24, and best practices from leading manufacturers. We follow OSHA lockout/tagout, verify NEC‑compliant electrical work, and ensure outdoor air and filtration strategies support your IAQ goals. Where permits are required, we coordinate with local jurisdictions in Pasadena and Los Angeles County.

Healthy air and energy outcomes

Because healthy air is our mission, we look beyond the immediate fault to improve indoor air quality and efficiency. Typical upgrades include right‑sizing filters to target MERV without excessive static, coil restoration that lowers compressor or chiller load, drive tuning to match fan curves, and sensor upgrades to stabilize sequences. The result is quieter operation, steadier temperatures, lower kWh, and cleaner air for occupants.

Industries we serve in and around Pasadena

• Offices, retail, mixed‑use, and hospitality
• Schools, colleges, and labs
• Healthcare clinics and medical offices
• Light industrial, warehouses, and server rooms

We cover Pasadena, Altadena, San Marino, South Lake, Old Pasadena, Playhouse District, East Pasadena, and Hastings Ranch, with rapid dispatch across Los Angeles County and nearby Orange County, Ventura County, and Western Riverside County.

Factory training that matters

Our technicians have completed training at manufacturer facilities for Fujitsu (Japan), Mitsubishi Electric (Thailand), Midea (China), Gree (China), and Haier (China). That foundation, combined with our 80+ years of multi‑discipline engineering, enables us to solve complex AHU issues quickly and implement durable fixes that hold up under real‑world conditions.

Repair, retrofit, or replace?

We prioritize repair when it is safe, code‑compliant, and cost‑effective. If a retrofit yields better lifecycle value—fan array upgrades, coil replacements, drive conversions, or control modernizations—we present clear options with ROI, utility incentive guidance, and downtime planning. When replacement is the smart move, we help you scope capacity, filtration strategy, economizer needs, and integration with your existing BMS.

Maintenance that prevents repeat failures

• Belt tension and alignment checks, bearing lubrication
• Coil cleaning schedules and drain pan hygiene
• Filter change protocols based on pressure drop, not just dates
• Seasonal economizer calibration and actuator verification
• VFD parameter review and trend analysis to catch early faults

Planned maintenance reduces emergency calls, stabilizes IAQ, and keeps energy spend predictable throughout Pasadena’s seasonal swings.

Get fast help today

If your commercial AHU in Pasadena is down, short‑cycling, noisy, or failing IAQ targets, we can help—fast. Contact #1 AC Guys for same‑day diagnostics and a clear, engineered repair plan. We’ll protect uptime, deliver healthier air, and earn your trust with craftsmanship that lasts.