The heating and cooling demands of each modelled zone are predicted in TRNSYS assuming initially that a 100% efficient heating and cooling system is in operation to maintain comfort 24 hours a day. The system adjusts the zone temperature according to the thermostat settings which have been set to satisfy thermal comfort requirements for the occupants.

Table 2 shows the recommended temperature settings suggested by CIBSE [10], based on stated values of met and clo, and a PMV of ±0.25. Where specifically indicated (*) a more tolerant thermal comfort requirement (±0.5 PMV) was used in the calculations of the thermal comfort conditions. These temperature bands were used as thermostat settings in the 12 models.