Des Moines work is protein processing and cold storage first, grocery rack second. Iowa's statewide average for refrigeration technicians, mechanics, and engineers is about $60,000 a year, mid-pack nationally, with plant and industrial ammonia roles pulling the top end (see the refrigeration tech salary by state ranking). EPA 608 certification is federal law before you touch refrigerant; Iowa's separate licensing rules are covered in the state license requirements guide.
Ankeny, Ames, Council Bluffs, Newton, and Marshalltown all pull from the same tech pool, and plant work outside the metro often pays a travel or shift premium.
Iowa averages roughly $60,000 a year across technicians, mechanics, and engineers. In Des Moines the spread runs from grocery rack service at the low end up to ammonia plant and cold storage roles at the top.
Yes. The beef and pork plants and Hy-Vee's in-house teams both hire helpers and cross-train HVAC techs; get your EPA 608 and a helper spot and let the plant teach you the rack or the ammonia system.
Ammonia, and it isn't close in this metro, because Des Moines is a protein town. Rack work at grocery chains is the steadier schedule; plant refrigeration pays the premium and the on-call.