Central Vac = A vacuum system that's built into the house. In general, every room has an outlet and you just plug your vacuum hose into the wall socket.

Central Vac has been out for 15-20 years ... nothing new, but I do know that it use to be pricey to install. Not sure about now.

http://www.repelsecurity.com/img/Cen...cuumOutlet.jpg
http://www.vacorama.com/images/centr...ic_vac_pan.jpg