Do I need to give a forwarding address to my Pennsylvania landlord at move-out?

Yes. Most Pennsylvania statutes (and 68 P.S. 250.512) condition the deposit return on the tenant providing a forwarding address. Without it, the landlord can hold the deposit until contacted. Provide the forwarding address in writing (email or letter) on or before move-out, with a clear request for return of the deposit. Up to 2x the deposit plus attorney fees if the landlord fails to return within 30 days without good cause, per 68 P.S. 250.512. The forwarding address is the address where the landlord must send the deposit and itemized statement; if the tenant changes it, the tenant should update the landlord.

Source: 68 P.S. 250.512