What is the entire price of a central vacuum installation? The average central vacuum cost for a system installed in a home less than 3,000 square feet varies but only costs between $1,200 to $3,000.Central vacuum price variations depend on the number and style of wall inlets, the size of the power unit and the hose, the accessory kit, and any optional extras.n addition, a central vacuum reduces allergies and is quiet, versatile, and cost effective: most homeowners recoup their investment once the home is sold. To learn more about the benefits of installing a central vacuum system in your home, see Seven Reasons to Install a Central Vacuum.