Regulations in many countries establish limits on noise produced by building services and equipment and refer to international standards such as ISO 16032 and ISO 10052 or to national procedures for the verification of such requirements. This study analyses the distribution of sound produced by HVAC equipment in an office building. For that purpose, systematic measurements were conducted at multiple locations within a room to determine spatial variations in sound pressure levels produced by internal units. Factors influencing noise assessments such as room geometry, spatial sampling, HVAC equipment settings and the presence of background noise are also examined. The ultimate aim of this work is to study how variations of sound pressure levels affect the assessment of LAeq and to propose practical recommendations to assess noise from building services to fulfil regulatory requirements.