I am not one of those people (I live for those 90 degree days, no joke), but I do understand that everyone has a different body temperature and preference. I also understand that during the summer it's very tempting to turn on the air conditioning and literally chill. However, as you can guess, that's not very eco-friendly, so I've compiled a list of sites that share tips on how to stay cool while also being green.
The Living Green Solution
Green is Sexy
Green Living Online
Living Green and Saving Energy
California Energy Commission
Green Feature on Yahoo
Other great sites and books that might have helpful [green] tips...
Sophie Uliano -and her book Gorgeously Green
Danny Seo -and his book Simple Steps to a Greener Home