Even after regular vacuuming, your carpets can store dust, bacteria and allergens. For thorough carpet cleaning, you must hire a carpet cleaning service. The frequency of hiring carpet cleaning services differs from the person to person.
It depends on the footfall on your carpet. It depends on how well you maintain your house and fight dust. If you have kids or pets, you would require professional carpet cleaning more often than others. The same is the case when you live in a remote area with plenty of dust around. The average frequency suggested by the experts is twice a year.