3. Determine system output – Heat balance

Calculating the heat balance of an air-conditioning system makes it possible to determine the system's capacity in summer and winter, based mainly on two criteria:

1) internal heat gains from sources inside the room: number of occupants, lighting, household appliances; these gains are relatively constant depending on the time of day. It is important to take this into account in summer;

2) external inputs: sunlight and heat or cold inputs through walls, openings (glazing), roof, ceiling, floors and air renewal. These inputs depend on insulation, room orientation and size, outside temperature variations and building location.

The heat balance must be carried out by a professional. It is very important, because an installation that is too weak generates high electricity consumption, and one that is too powerful is too...