Hey everyone. So my father has tasked me with deciding on what tree (or two) to plant in his backyard to provide some shade on a wall that tends to get very hot in the summer and thus heat up the house. His only requirements are that it be somewhere in the 15-25' tall range and not be notorious for surface roots that may cause problems when he mows. The area is zone 6b/7a and gets full sun. I'm looking for some neat suggestions. What Acer would you plant?