Marcus D. Trevino

Profile

EPA 608 Universal-certified HVAC technician with 11 years of field experience across commercial, industrial, and residential systems up to 500-ton capacity. Specialize in preventive maintenance program design, refrigerant system diagnostics, and building automation integration. Reduced equipment downtime by 34% at a 1.2M sq ft distribution facility by redesigning the PM schedule and training a four-person crew.

Work Experience

Lead HVAC TechnicianMar 2019 - Present

Apex Mechanical Services, San Antonio, TX

Directed maintenance and repair of 180+ rooftop units, chillers, and VRF systems across 14 commercial accounts, cutting average service-call response time from 4.1 hours to 2.3 hours.
Designed and implemented a seasonal PM program that extended average equipment lifespan by 2.1 years per unit and saved clients a combined $310,000 in premature replacement costs over three years.
Mentored three junior technicians in refrigerant handling, EPA compliance, and BAS troubleshooting, resulting in all three earning EPA 608 certification within 8 months of onboarding.

HVAC Service TechnicianJun 2015 - Feb 2019

Coldstream Building Solutions, Austin, TX

Serviced and repaired Carrier, Trane, and Lennox commercial HVAC units ranging from 5 to 150 tons for a portfolio of 60 retail and office clients, maintaining a 97% first-visit resolution rate.
Identified and corrected refrigerant leak patterns across a 22-building retail chain, recovering 480 lbs of R-410A annually and reducing the client's refrigerant spend by $28,000 per year.
Installed and commissioned 34 Honeywell BAS controllers, enabling remote monitoring that decreased after-hours emergency calls by 41% within the first year of deployment.

HVAC Installer & Apprentice TechnicianAug 2013 - May 2015

Rio Grande Comfort Systems, San Antonio, TX

Assisted lead technicians on installation of split systems, package units, and heat pumps in 200+ new residential and light-commercial construction projects across Bexar County.
Completed 4,000-hour NATE-approved apprenticeship program with a 98% skills-assessment pass rate, earning journeyman status 3 months ahead of the standard timeline.
Performed duct sealing and insulation upgrades on 45 residential retrofits, improving measured SEER efficiency ratings by an average of 18% per home.

Skills

EPA 608 Universal CertificationNATE Certification (Air Conditioning & Heat Pump)Refrigerant Recovery & Handling (R-410A, R-22, R-32)Building Automation Systems (Honeywell, Johnson Controls)Chiller & VRF System DiagnosticsPreventive Maintenance Program DesignCommercial Rooftop Unit Servicing (Carrier, Trane, Lennox)HVAC Load Calculations & Energy AuditingOSHA 10 Certified

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