Pick a commercial refrigerator in this order: form factor, then capacity, then match the duty to where it sits. The rest (energy, refrigerant, NSF) narrows the shortlist.
Capacity in doors/cubic feet for your volume. Duty & ambient: spend on the high-use door that opens every ticket beside a hot line; save on low-duty backup storage. Energy: certified use spans roughly 3.7× across models — the cheap unit can cost hundreds more over its life. Refrigerant: R-290 is now standard and efficient. NSF certification is required for the health department.