Credentials Licenses: General Contractor #WILSOAT0660L      Specializing in mechanical contracting. Specialty Electrical #WILSOAT009KQ Education: All service employees have formal refrigeration training either from J.M. Perry Institute in Yakima, WA or Universal Technical Institute in Phoenix, AZ. Certifications: All field employees are E.P.A. Certified for handling of refrigerants. All field employees have specialty electrical certifications.