Curious about which you like better. Due to my 1920's built house design, number of windows and doors and the straightline placement of them, I need mine in the ceiling due to a lack of wall space for furniture placement. What are the advantages/disadvantages to each? I'm pretty much decided on the ceiling. Also, do you ALWAYS want vents over/under a window or french doors? I will have two sets of french doors(yet to be added,remodeling) in my living room and 1 window(already there). They have planned 2 vents in this room. Should 1 go over/under the window, and the other go over/under the french door that will be on the end of the house? Hope this is not confusing. Thanks!