Is a Rater responsible for performing Manual J load calculations?

A Rater is not required to perform Manual J load calculations as part of their standard responsibilities. The HERS Rater's primary role is to assess a home's energy performance, rather than to conduct detailed HVAC load calculations, which typically fall under the purview of HVAC professionals or engineers who specialize in thermal load assessment.

Manual J is a standardized method used to calculate the heating and cooling loads for residential buildings, ensuring that HVAC systems are appropriately sized for energy efficiency and comfort. While Raters may have knowledge of this process, it is not a mandated duty in their training or certification. This separation allows Raters to focus on rating systems and ensuring that homes comply with energy efficiency standards according to the HERS guidelines, rather than engaging in the detailed engineering calculations that Manual J entails.