There are three different settings and personally I like to use the Boost because it picks up everything and that is up to 8 minutes of straight sheer suction power whereas the middle does about 28 minutes and the economical one does about 43 minutes so if you're just doing a carpet for one room then I would highly suggest using boost mode for that one room completely unless you have multiple rooms then I would suggest using the middle setting. The choice is yours but I hope I've answered your question