Legal Question in Landlord & Tenant Law in Pennsylvania

thirty days provided you have given your landlord a new address and complied with the other requirements of the lease, like returning keys etc.

Providing your landlord with your new address (in writing) triggers a thirty-day period during which the landlord is required to return your security deposit or an explanation why the deposit is not being returned. If you do not hear from your landlord within that period, you can file suit against him/her for double the amount of the deposit.