France, June 28 -- One in three homes in France is so poorly insulated it turns into a "boiler" during heatwaves, says the NGO La Fondation pour le Logement. The group found that 3,700 people died in France last summer because of extreme heat.

French MPs from seven political parties want to fix the problem. They plan to submit a bill to the National Assembly to tackle what the Foundation calls a "social, ecological and health emergency".

In the northern suburbs of Paris, Yasmine and her husband live on the 13th floor of an 18-storey building. Their flat is like a "boiler" because it is badly insulated.

"It's very hot in here. We sweat a lot, so we take at least five showers a day," Yasmine told told RFI.

"The sun comes directly into t...