If you do a search on this site (as well as some others) you will see some horror stories about the use of subcontractors for these types of projects, as well as sometimes limited support from the company you bought the product from.
I would suggest going with a firm that uses their own employees for the installation, and to use a credit card for additional protection.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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