What type of flooring do you have? Uprights are generally better performers on carpeting. But if you're set on getting a canister vacuum to clean your wall-to-wall carpeting or a lot of area rugs, choose a model that works well for this type of flooring. Most canister vacuums work great for bare floors.
Is pet hair an issue? Look for canister vacuums that offer special attachments designed to ease pet-hair cleanup, such as a pet-hair brush or an attachment with rubber fingers that helps grab pet hair from soft surfaces. Crevice tools are useful for reaching corners and crevices where hair tends to build up, and standard upholstery brushes can help remove pet hair from furniture.
Does anyone in your home suffer from allergies? A canister vacuum with HEPA allergen filtration is best for allergy sufferers. HEPA filtration cleans out particles down to 0.3 microns in size from the air as it moves through the vacuum, leaving behind less dust, debris and pet dander that can aggravate allergy symptoms. HEPA filters are required to have a minimum efficiency of 99.97 percent, according to GoHepa.com.
What's the layout of your home? Maneuverability is less of a concern if you have an open floor plan, so you could safely purchase a heavier or less maneuverable vacuum without a problem. But if you have a lot of tight spaces and hallways, maneuverability is key. Single-wheel canister vacuums like the Dyson models turn on a dime and can easily navigate nooks and crannies.
When will you use your canister vacuum? Canister vacuums are much quieter than their predecessors, but noise can still be an issue. Some models are so quiet that they don't interfere with typical conversation, and some won't even disturb sleeping family members.
Do you want bagged or bagless? Choosing between a bagged and bagless canister vacuum is really about personal preference. Bagged models have added costs of replacement bags, while bagless vacuums tend to have smaller capacities and must be emptied more frequently, a process that can be messy.
Most canister vacuums have washable filters, so the only cost of ownership to consider is the cost of replacement bags if you choose a bagged model. Most replacement bags cost between $1 and $2 each. There are also generic vacuum cleaner bags available for a lower cost, but some canister vacuums depend on the collection bags for filtration, so choose wisely. Because some bags fit different models, it's also possible to add an additional layer of filtration to a less expensive canister vac by opting for odor-reducing bags or bags with HEPA media that will work with your model.