Conchalea, we have a house with no ductwork, and though it does not get as hot as Texas, my sewing room would stay over 90 if I did not have AC.
I have the portable units that you exhaust out the window. So when I use it I open the window and close it on the vent, and when I don't need it or it's raining, I take it out and close the window.
In the winter it stores under my cutting table. We have several of these, including one in my LA shed.
I'm about ready to start using it upstairs, it's getting over 80 in the afternoon, and since "the change" I have a real hard time coping with temps over 80. At least it's improved, I use to about die when it got over 70!. At least I live rural so I can run around with almost nothing on at home and not worry about offending anyone!