polyGeek, I am hugely impressed with your fortitude. Florida is humid! How are you handling the humidity? Is turning on the AC for a short time sufficient for cooling things off enough?
I think that's a great idea to use the AC to take the edge off. i am sorry about the spiders.
It sounds like you are using the AC like I use my fridge - i try to keep it from going on at all, and then when it does kick in, It just normalizes the cool temps i need.
YES on the PC being a heater! I've been trying not to use any heater type things inside - no coffeepots or such, but with the computer i need to be inside where it is cool. At least my netbook makes a small draw. The external monitor is something I might want to consider avoiding if it gets to the high 90s, though.
Has it got to the 100s yet? I don't know much about florida summers but my guess they are worse than AZ summers.
You are lucky the space you live in is pretty much self contained; you're free to experiment without worrying about the rest of the household. I bet you could get your garage going on solar if you wanted to. Or running on a wind turbine? I don't know what kind of wind you have there, but my guess is there's plenty of sunshine.