It's 11 pm, and just now when the heat clicked on a rotten eggs smell suddenly seemed very strong. My husband was in another room and he thinks it also smells like sulfur. My daughter thinks her room stinks too. I saw one post that that kind of smell could be from the chemical that is to show a gas leak which would otherwise be odorless. Is that true? Do we need to leave our house? My daughter is 4.

Rotten egg smell could be mercaptan a gas odorant. I would call the gas company Immediately.