Heat transmission is a process by which heat naturally  flows from a region of higher temperature to region of lower temperature, until both regions achieve the same temperature.
It is very important to consider that the use of insulating materials affects the flowing of heat among regions. There can be three possible ways of heat transmission:
- Conduction: it is a form of heat transfer between bodies with different temperatures which requires physical contact between them;
- Convection: heat transmission by virtue of liquids (for example water, air, etc.);
- Radiance: heat transmission through empty spaces (for example, solar radiance).
This is the main cause of heat dispersion thus representing about the 80% of the total energy consumed in houses in winter.
The systems avoiding thermal dispersions are:
- The traditional insulating system: contrasts the heat flowing with the thermal resistance (the property of a material that indicates its ability to contrast the heat flowing);
- Reflective insulating system: avoids the heat flowing with the reflective power (the property of a material that indicates its ability to reflect heat).
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