Ask Mr. Smarty Plants

First, lets get up to speed on oak wilt. Mr. Smarty Plants suggests reading the material from these three sources, Texas Oak Wilt Information Partnership, the Texas Forest Service, and the USDA , to become more knowledgable about oak wilt. The fact that the previous trees died from oak wilt may be problematic, depending on how long they have been gone, and if there is any living root material beneath the soil. If there are oaks nearby, or if there is an old stump with stump sprouts, living roots could still host the fungus.

According to the  Texas Oak Wilt Information Partnership, the oak species least susceptible to oakwilt are: White oaks, including post oak (Q. stellata), bur oak (Q. macrocarpa), Mexican white oak (Q. polymorpha), white shin oak (Q. sinuata var. breviloba), Durand oak (Q. sinuata), Lacey oak (Q. laceyi), and chinkapin oak (Q. muehlenbergii), are resistant to the fungus and rarely die from oak wilt.

In terms of providing shading for windows while you are waiting for your trees to grow, have you considered vines? They are fast growing, some are evergreen while others are deciduous, and some have beautiful flowers. They could be a "temporary" fix for your windows. You would most likely need to provide trellises for them to grow on.

I'm including links to two answers from previously asked questions that concern fast growing trees and vines in Austin, TX.

   Question #1962

   Question #2394