A Sears air conditioning rep told me that if I go with other vendors like Costco, they will ask a local vendor to fulfill the installation of the unit. There is a chance that the vendor will further subcontract the job to another company. He said that if Costco paid the vendor but it does not pay the subcontractor, or the provider of the equipment, the subcontractor and distributor can put a lien on my place. Is it true in California?