The aim of this study is to present different possibilities of use offered by an air-earth exchanger. With the help of real site experimentation from which a simplified simulation model has been validated, the efficiency of this system when it is coupled with an individual house is demonstrated. It is shown that this system can be used to save 10% of house energy consumption by preheating fresh air in winter, to avoid freeze risks in a dwelling during winter, to refresh air and to improve comfort conditions in summer. For this case, it keeps house ambient temperature under a value of 27 degrees C without using a conventional air-conditioning system. Finally, actual limits of the study which has only been carried out for the specific case of house and air-earth exchanger are given.