HI Debbie and Sunny,
The MSAA has a cooling program which is great if you qualify for their income guidelines. I didn't, but the MS Society has a program that they do to help out with heat issues for the summer like help with utility bills, cooling vests, etc. You decide what you want to use the money on. Call your local chapter for info.
As far as the heat is concerned, I am okay as long as I stay indoors. I am able to keep my house cool enough. It is when I go outside that is tough. I live in the inland San Diego area, so humidity isn't usually a problem, just the dry heat.
Sunny, you aren't kidding there are a lot of vests to choose from. I hope too, that someone would be able to give me some recommendations and insight.