Determining the indoor design temperature for each space in a building involves considering factors such as the type of occupancy, activity level, and desired comfort level. For example, a office space may require a lower indoor design temperature than a warehouse or storage area. The indoor design temperature should also take into account the outdoor design weather conditions and the building’s construction characteristics. A general rule of thumb is to maintain an indoor design temperature between 22°C to 25°C (72°F to 77°F) for most commercial and residential buildings.