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This document contains information to support the correct understanding and use of ISO 52016-1 and ISO 52017-1. These documents give calculation methods for the assessment of: — the (sensible and latent) energy load and need for heating and cooling, based on hourly calculations; — the (sensible and latent) energy need for heating and cooling, based on monthly calculations (ISO 52016-1); — the internal temperature, based on hourly calculations; and — the design (sensible and latent) heating and cooling load, based on hourly calculations. This document does not contain any normative provisions. NOTE A description of the rationale behind the reorganization of the cluster of strongly related and partly overlapping ISO and CEN standards is given in Annex H.