Rachel is a 35 year old school teacher who has no man in her life and lives with her mother.
Each element give off a particular color when heated in a flame. (Some are colorless). Copper gives off a green flame but to do that there must be some copper compound IN the flame. (there are many other elements that also could be causing a green flame).
I've even seen claims that the blue of a gas flame is due to the copper tubing used in the burner. All I can say is, if your furnace is emitting vaporized copper into your living space, you'd better find a safer heating system like, say, setting your sofa on fire. To be fair, blue and green flames can be due to copper.