I use 505 spray basting INSIDE in my basement. Hardly any odor unlike many of the other spray bastng products. I once used a "quilting spray basting" that was SO strong that it was really stinky even out side! I would suggest that you order 505 on line (can not find it locally) and try it- you will really like it. Spray basting is easier, quicker than pinning. Also the quilt sandwich is lighter and easier to work with than using pins that make quilt heavier. Also spray basing really lets yiou flop the quilt around without it moving since the layers are "glued" together.
Since you live where it is hot/warm most of the time you can sandwich you quilt OUTSIDE. Just get a large table and put a large piece of plywood on top and use that to sandwich your top. I love working on quilts outside in the fresh air! (in the shade of course)
Use a longarmer if you can afford it.(personaly I can not afford it). It is hard work to quilt your own large quilts what with stuffing the top thru the machine.