I found your HVAC suite some time ago and have just now gotten around to using it. Very impressive lisp routines! So I thought I would go straight to the source with my questions. I have modified the createduct.lsp slightly to include some defaults and match our company standards. I am having trouble getting it to accept defaults on the portion where it asks for user input of duct size...width, height, diameter. I would like it to remember the last entry so the user can hit enter or allow for new sizes to be entered (similar to the way the fillet command works)