| http://www.w3.org/ns/prov#value | - and about 9,000 carpet and upholstery cleaning companies with combined annual revenue of about $35 billion.When you add other services, such as pest control, window cleaning, parking lot maintenance, security, and heating, ventilation, and air conditioning (HVAC) facilities management, the competitive market is valued at $78 billion, according to a Marketdata Enterprises report.
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