What kind of vacuum should I buy?

Many models and brands are effective, but CFM (cubic feet per minute) is the key. This is what creates the actual suction. The better the vacuum is sealed, generally the better the CFM. Try to find a vacuum with HEPA filtration. That means it has a fine filter to keep dust and allergens trapped inside the vacuum instead of blowing them around your home. Make sure you set the beater bar to a proper height and keep the bag or canister from overfilling. You should be able to buy a very good vacuum for 200.00-400.00.

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