Hey Russ, thanks for the reply. I thought of the load calculations also, but that would give me the allowable minumum load per the NEC. I want to make sure I'm not overloading the allowable peak usage of this existing panel, located in the basement. I should mention that it's a large, older home with at least two "lighting & branch-circuit" subpanels located on an upper floor and in the garage. There is also a heated inground pool on premise. BTW, wish it was my house...without the taxes of course.

Thanks,
Andy