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A canister vacuum is generally more versatile. Like uprights, canisters handle carpets, but they're also great at cleaning bare floors, vacuuming stairs and sucking up dirt from corners.

If you're tempted to buy a model with the highest amps, horsepower or watts, you might want to think again. These numbers are simply measurements of the electrical current used by the motor. A vacuum cleaner's performance depends on airflow, the amount of suction it produces, and other factors including the overall design and attachments.

If you think your vacuum isn't cleaning as well as it used to or the brush roll has stopped turning, it may be time to change your belt. First, shut off your vacuum and unplug its cord. It's not difficult to replace the belt as long as you have a screwdriver and a replacement belt. For instructions for your specific vacuum, refer to your

If your bag is filled to the indicator line, it's time to change it. Even though some vacuums have "check bag" indicator lights, it's best to check the bag yourself and change it when it's no more than three-quarters full. If you have a pet or you vacuum up fireplace ashes, you may have to change the bag more often. To be o

You don't have to change the filter as often as the bag. If the filter shows signs of wear, or is excessively dirty or torn, it's time to replace it. HEPA filters — ones that remove most dirt particles — should be changed after six months or after the sixth bag change. The owner's manual will tell you where the filter is

In an ideal world, an area that has heavy traffic should be vacuumed every day. But once or twice a week is more realistic with today's busy lifestyles and certainly enough for areas that aren't often used. For best results, slowly move the vacuum over the carpet several times, going back and forth and side to side in parallel rows.