Yes, you can! The relatively small amount of space required by a roof-mounted AC AC, A.C. or Ac may refer to: Air conditioning, technologies for altering the temperature and humidity of air; Alternating current, a type of electrical current in which the current repeatedly changes direction. " data-gt-translate-attributes="[{"attribute":"data-cmtooltip", "format":"html"}]">AC unit is one of the primary reasons most of us choose it. This might be a great option for people who live in residential areas and don't have a lot of room for their air conditioning system.