Many factors affect the indoor environment of residential buildings. Among those factors are thermal insulation, airtightness, and the space-heating patterns. The influence of these factors on indoor thermal environment and spaceheating load is investigated by a multizone thermal and airflow simulation including mutual radiation. The computer simulation was done on a model of a detached house with 10 rooms. The results obtained from this study show the degree of the effect of these factors on thermal environment and heating load.

KEYWORDS: Analysis, buildings, housing, performance, models, thermal insulation, calculating, space heating, air tightness, heat load, air flow.