Attic Loft Space Below The Roof

Attics can also help control temperature in a house by providing a large mass of slowly moving air. Hot air rising from lower floors of a building often gets retained in the attic, further compounding their reputation as inhospitable environments. However, in recent years many attics have been insulated to help decrease heating costs since on average, uninsulated attics account for 15% of the total energy loss in a typical house.
In some places "attic" is used more specifically to apply to lofts which have boarded floors and ceilings, and usually windows or skylights, and then "loft" is kept to mean a dark, unboarded roof-space which lacks these features.