An EnerGuide Rating System (ERS) Licensed Service Organization (SO) is any organization whose role, under a contract or contribution agreement with NRCan, is to implement and deliver the EnerGuide Rating System (ERS) service at the local or regional level.

Service organizations manage the business relationship with their personnel providing the service to builders and the public.

An EnerGuide Rating System (ERS) evaluation is performed by an "registered energy advisor" who, in the judgement of the service organization, is trained to meet the requirements for the delivery of the service.

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