It is hereby declared to be the policy of this Commonwealth that each housing authority shall manage and operate its housing projects in an efficient manner, so as to enable it to fix the rentals for dwellings at the lowest possible rates, consistent with providing decent, safe, and sanitary dwellings, and that no housing authority shall construct or operate any such project for profit. To this end an Authority shall fix rentals for dwellings in its projects at no higher rates than it shall find necessary, in order to produce revenues which, together with all other available moneys, revenues, income, and receipts of the Authority from whatever sources derived, will be sufficient--
35 P.S. § 1552