I am trying to solve a problem with a room situated between the garage and the porch. Currently, the room is on a slab with a short piled carpet. I would like to remove the carpet and put down tile but this room is cold because of what I mentioned above and it is about 1 foot lower than the rest of the house. It has been suggested to use hydronic radiant heat under tile. This would probably be more effecient than coil because the house is gas/fhw heated. Has anyone experienced problems with this sort of system? Could there be any problems since 3 of the walls face the outside and the garage(as in a power outage...I live NW of Boston)? Also, after the job is done, how much space does it take up, vertically?