Home Improvement Questions? Ask a Handyman for Answers
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It's possible your plenum ( the sheet metal box where the supply ducts originate) doesn't meet current design criteria but there is no code that would require you to make any changes. It's time for a second or third opinion. Why did you call them ?
Is the unit in the attic? if so yes you need at least a cat walk to access and service the unit. Fiberglass duct board is an acceptable material for duct work. Your existing ductwork is grandfathered anyway.
I don't understand. Lease refund?
So you want a refund?