No, they would not be appropriate and fall in PA could be 95 degrees when you are there.Would ankle boots be appropriate? Especially for those colder interviews... like Pennsylvania in the fall. (I'm from California, so their "Fall" is our Winter) Help.
If you're comfortable walking around in them for a number of hours, and they're not too "provocative", I'd say go for it. There are also lower heels that are pretty comfy if you think you don't want to wear flats, but you think you might not be able to manage the walk in 3 inches. I got these (http://www.dsw.com/shoe/lifestride+parigi+pump?prodId=dsw12prod4890026&productRef=SEARCH), because my higher heels were a bit uncomfortable in the toes