No. Only the hose or the attachments are portable in a central vacuum system. A portable vacuum is a standalone model like a stick, canister, or upright. A central vacuum system is defined by a central power unit, which is installed in one place like an AC unit, and the connected network of piping to funnel the suction.

Yes, installing a central vacuum system typically adds value to your home. The ease of use, longevity, and superior suction power of a central vacuum system can add up to $2,000 to your home’s value if you decide to sell. Potential buyers may consider the central vacuum a perk to purchasing your home.

The disadvantages associated with central vacuums start with cost. They are expensive to install, especially in existing homes, as retrofitting requires opening walls. The system's bulky hoses can also be inconvenient to maneuver and store compared to portable vacuums. Additionally, repairs may need professional service, adding to maintenance costs. Lastly, while powerful, they may be overkill for smaller homes or apartments, making the investment less practical for some households.

Common repairs for central vacuum cleaners include motor repair, electrical repair, and blocked filters. Central vacuum motor issues typically come with a burning smell and loss of suction. With these issues, you might need simple lubrication to keep it running smoothly, or for more extreme problems, you could need a motor replacement. 

Electrical problems or losing suction strength, might be reasons to swap out electrical components for new ones. However, a local central vacuum repair professional can tell you the best plan of action for your system.