The summer of 2006 was marked by a heat wave that resulted in fewer deaths than anticipated. As part of the heat wave plan, INPES had implemented a two-pronged communication strategy aimed at both the general public and the elderly, which was widely covered by the media and other outlets. Two surveys were conducted among representative samples of the French population (quota method) comprising 1,270 people aged 15 and older in September 2005 and 1,240 in October 2006 to measure changes in behavior and assess the effectiveness of the communication campaign. The results indicate that 63% of French people report having taken measures to protect themselves from the adverse effects of the heat wave, a significant increase since 2005 (48%). These measures were adopted by 65% of those who recognized the communication campaign. Recognizing the INPES campaign specifically is not linked to having adopted specific measures during heat waves. 73% report having taken measures to assist or support the most vulnerable individuals. Half reported having recognized at least one ad from the "Let’s Not Wait to Show Solidarity" campaign. This recognition is linked to having taken measures to assist the most vulnerable. The findings of these two studies are encouraging, as they show that over time, the public has become more familiar with the actions and support measures to adopt during heat waves. The communication efforts have therefore fully fulfilled their role in raising public awareness, a role that complements the various national and local initiatives that were jointly implemented during the heatwave of the summer of 2006.