There are two types of vacuum cleaners

There are two types of vacuum cleaners: upright and canister. Upright cleaners excel in cleaning carpets while canister cleaners are more versatile, but are less mobile.
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There are bag vacuum cleaners, and bag-less. Bag vacuums use a paper bag for collection of dirt. Bag cleaners also have filters. So, you will need to budget the cost of filters and bags when you consider this type.

Lift, airflow, filtration, design and noise are major factors that should influence your buying decision.
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How much air can the vacuum cleaner move? The ability of a vacuum cleaner to remove dirt from floor and furniture is determined by airflow. This is measured in cubic feet per minute (CFM) or liters per second (LPS).
How well does the vacuum cleaner pull up dirt? The lift is good on vacuum cleaners with high airflow. Before you buy one, insist on seeing the inches of lift.

Without filtration, the vacuum cleaner won't be able to prevent dust and dirt moving through the system without obstructing the airflow. The cleaner is effective as long as its filtration is good.

Airflow and lift can be adversely affected by bad design. This could also create gaps that throw dust into the air. However, a cleaner that looks good but doesn't perform isn't worth buying.

Dyson uses a patented technology called Root Cyclone to improve airflow without a bag and a filter as used by conventional cleaners. This makes Dyson cleaners superior.

Noise considerations also influence buyers. Some cleaners come with insulation material around the motors, to reduce noise.

Dyson Vaccum Cleaners are known to perform relatively noiselessly.

Getting into corners and under furniture depends on the width of the head of the cleaner. Too much width or height will adversely affect performance.

Though some models such as Dyson DC07 have high clearance, the other models of Dyson Vaccum Cleaners satisfy, on this score.

A clog in the filter can prevent suction. The manufacturers of Dyson Vaccum Cleaners claim to have solved this problem by using a HEPA (High Efficiency Particular Air) filter. They offer a lifetime warranty on it. They also claim that this type of filter is ideal for those who suffer from allergies. The British Allergy Foundation has endorsed the claim. For some people, allergy is a major reason for using a vacuum cleaner.

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