The first step is to gain a strong understanding of refrigeration. Without a solid grasp, it’s likely you’ll be turned away from opportunities. You might want to explore maintenance jobs at cold storage facilities. If getting directly into ammonia refrigeration proves difficult. Chicagoland has many HVAC positions that can help you build refrigeration skills. Becoming a commercial kitchen repair technician, focusing on cold equipment, can also enhance your expertise. Consider reaching out to Pipefitters Local 597. I think they offer apprenticeships that started around $50k. D&H also works with industrial refrigeration, so sending them your resume could be a good move.
Here are some service jobs that may interest you.
https://unlimitedservice.com/careers/

unlimitedservice.com
Careers at Unlimited Service Group
We provide diverse career paths across our network, encompassing technical service, customer support, and corporate roles.