Hello everybody! I am not a professional and I want somebody that can help me to clarify what is the difference in efficiency between the forced air gas furnace and heating with water either through water heating elements or trough the floor . Also what are the advantages of one over the other, as far as clean, noise the fact that the AC is used from with the same ducting and sometime it comes from the bottom etc... . What is the best most energy efficient method out there? solar , geo, etc.. Any links to articles would be greatly appreciated. Thank you!