Jack Coloso
Fall River,WI
Summary
Resourceful Senior Service Technician experienced in HVAC service, controls, and troubleshooting. Achieved high productivity through effective preventive maintenance and customer service skills. Focused on delivering exceptional support to clients and teams while enhancing operational efficiency.
Overview
1
1
Certification
39
39
years of professional experience
Work History
Senior Service Technician
JB Mechanical
Beaver Dam, Wisconsin
06.2025 - Current
- Diagnosed commercial HVAC systems for JB Mechanical
- Serviced HVAC rooftop units, ensuring optimal performance across customer sites.
- Repaired refrigerant leaks and recharged systems, restoring cooling performance and preventing further equipment issues.
- Inspected electrical controls, wiring, and safety devices for proper operation.
- Installed replacement parts using manufacturer specs and field service procedures.
- Assisted in installation of new systems and equipment, enhancing customer satisfaction and system reliability.
- Mentored junior technicians on troubleshooting, safety practices, and service standards.
Senior Service Technician
Service Specialist/Nextech
Sun Prairie, Wisconsin
10.2022 - 06.2025
- Diagnosed commercial HVAC and refrigeration systems for Agape Mechanical/CoolSys customers.
- Serviced walk-in coolers, freezers, and rooftop units across customer sites.
- Repaired refrigerant leaks and recharged systems to restore cooling performance.
- Inspected electrical controls, wiring, and safety devices for proper operation.
- Installed replacement parts using manufacturer specs and field service procedures.
- Documented service calls, parts usage, and maintenance notes in work orders.
- Communicated repair needs and schedule updates with customers and dispatch teams.
Senior Service Technician
Agape Mechanical/Coolsys
Lakeville, MN
01.2014 - 10.2022
- Perform service repairs and preventative maintenance on customers HVAC/R equipment in the Wisconsin region. Complete daily work orders and emergency repairs to ensure customers' equipment continues to run properly and efficiently. Maintain proper truck inventory and maintenance. Surveyed customer equipment and engineered replacements. Train new service technicians. Complete daily paperwork including billing, schedules, necessary quotes and all essential inventory orders.
- Conducted diagnostics on HVAC and refrigeration systems to identify issues. commercial HVAC and refrigeration systems for Agape Mechanical/CoolSys customers.
- Installed replacement parts according to manufacturer specifications and procedures. replacement parts using manufacturer specs and field service procedures.
- Conducted inspections of electrical controls, wiring, and safety devices for optimal performance. electrical controls, wiring, and safety devices for proper operation.
- Delivered insights to management regarding service request trends and customer feedback. updates to customers and dispatch teams regarding repair needs and schedules. repair needs and schedule updates with customers and dispatch teams.
- Guided junior technicians in troubleshooting techniques and safety practices. junior technicians on troubleshooting, safety practices, and service standards.
- Provided feedback to management on trends in service requests and customer feedback.
Service Technician
General Parts, LLC
Madison, WI
01.2011 - 01.2014
- Perform service repairs and preventative maintenance on customers HVAC/R equipment and repairs of commercial cooking equipment throughout the state. Completed daily service orders and emergency repairs, maintaining operational efficiency of customer equipment. Maintained truck inventory and organized daily billing and schedules to streamline service operations.
- Diagnosed commercial kitchen equipment using manuals, schematics, and test tools.
- Repaired gas, electric, and refrigeration units during field service calls.
- Installed replacement parts following General Parts service procedures and safety standards.
Building Engineer 2
Covance Laboratories
Madison, WI
01.2006 - 01.2011
- Perform preventive maintenance and troubleshoot building HVAC and mechanicals. Work with building automation controls which consists of Metasys and Andover. Led technical operations for fire systems, serving as primary contact for system integrity and compliance. Building contact for all building emergencies. Trained staff on Metasys and JCI fire systems, enhancing team knowledge and preparedness for emergency situations. Managed compliance with refrigerant regulations to ensure environmental standards were met..
- Maintained HVAC, plumbing, and electrical systems across Covance Laboratories facilities.
- Completed preventive maintenance on laboratory equipment, building systems, and utilities.
- Monitored building management systems for alarms, faults, and environmental conditions.
Building Supervisor/Mechanic
CNV Service Company
Madison, WI
01.2003 - 01.2006
- Served as project manager for construction within the existing courthouse, collaborating with the General Services Administration and their tenants and Federal Courthouse employees to service and maintain building mechanical systems.
- Supervised building operations and coordinated daily maintenance for CNV Service Company facilities.
- Inspected premises for safety hazards, cleanliness, and equipment issues across service areas.
- Scheduled repairs, custodial work, and vendor visits to support building readiness.
HVAC Service Technician
North American Mechanical
Madison, WI
01.1993 - 01.2003
- Diagnosed and repaired equipment issues Managed customer account information Conducted training sessions for new employees Participated in safety committee meetings
- Serviced commercial HVAC systems for North American Mechanical clients
- Diagnosed heating and cooling issues using gauges and electrical meters
- Repaired compressors, motors, belts, and thermostats on rooftop units
WHVAC Service Technician
Rudy Uttke and Sons
Milwaukee
01.1988 - 01.1993
Education
Diploma of completion -
The Refrigeration School
Phoenix, AZSkills
- Commercial HVAC diagnostics
- Refrigeration troubleshooting
- Electrical controls testing
- Refrigerant leak repair
- Rooftop unit service
- Preventive maintenance
- Field installation
- Service documentation
- Parts ordering
- Customer coordination
- Problem solving
- Technical communication
- Safety compliance
- Team mentoring
- Remote support
Certification
- Honeywell Control Classes Refrigerant Certification types 1 and 2
- Andover Control
- Trane Commercial Classes
- Various manufacture training
- State licensed Emergency Medical Technician/Intermediate Member of National Registry of Emergency Medical Technicians CPR Instructor
Timeline
Senior Service Technician
JB Mechanical
06.2025 - Current
Senior Service Technician
Service Specialist/Nextech
10.2022 - 06.2025
Senior Service Technician
Agape Mechanical/Coolsys
01.2014 - 10.2022
Service Technician
General Parts, LLC
01.2011 - 01.2014
Building Engineer 2
Covance Laboratories
01.2006 - 01.2011
Building Supervisor/Mechanic
CNV Service Company
01.2003 - 01.2006
HVAC Service Technician
North American Mechanical
01.1993 - 01.2003
WHVAC Service Technician
Rudy Uttke and Sons
01.1988 - 01.1993
Diploma of completion -
The Refrigeration School