Hariette,
Got new for ya. July-August are NOT the hottest months. Right here, right now is the epitomy of being hot. No breeze, sand flies eatin you alive. But this year we're not running from any hurricanes so far. I think I'll go put an ice pack on my melting brain. Its so hot we can't breathe and forget about running a computer between noon and 6 p.m. Bring a small fan to blow on your ocmputer at all times. I've learned from my past experience, computers that are built in the U.S. need larger internal fans, or they will overheat and start doing funky things.
--Silk
AmbergrisCaye.com 
